# python weekly reports

1. Pythonic way to replace list values with upper and lower bound (clipping)? - [18/2]
2. what is the most efficient way to find the position of the first np.nan value? - [11/4]
3. How to use type hints in python 3.6? - [10/3]
4. File size limit for read()? - [10/1]
5. Why does the symbol '{' remain when f"\{10}" is evaluated in Python 3.6? - [10/1]
6. Multiple 'for' loops in dictionary generator - [9/5]
7. Python: how to Parse and check the time? - [8/2]
8. Drawing fewer plots than specified in matplotlib subplots - [8/1]
9. numpy ufuncs speed vs for loop speed - [7/1]
10. Find array corresponding to minimal values along an axis in another array - [6/3]

1. Divide the list into three lists such that their sum are close to each other - [28/5]
2. How do overridden method calls from base-class methods work? - [20/5]
3. Finding the index of a numpy array in a list - [14/5]
4. Result of -1%7 is different in javascript(-1) and python(6) - [11/5]
5. How do I check for correlation using Decimal numbers/data with python 3 - [10/3]
6. Unpacking generalizations - [10/2]
7. Sort a list of tuples in consecutive order - [9/9]
8. Nested f-strings - [9/2]
9. Variable type annotation NameError inconsistency - [8/3]
10. Efficient identification of adjacent elements in numpy matrix - [7/5]

1. Randint doesn't always follow uniform distribution - [46/2]
2. Why is printf() giving a strange output in python? - [29/2]
3. Pythonic way of removing reversed duplicates in list - [16/10]
4. Why can you loop through an implicit tuple in a for loop, but not a comprehension in Python? - [15/3]
5. How to convert a list of multiple integers into a single integer? - [10/4]
6. How do I only print every 5th line - [6/7]
7. Apply function n items at a time along axis - [6/3]
8. Why is the boolean expression "1 in (1, 2, 3) == True" False? - [6/1]
9. How to convert arrays of x,y,z coordinates to 3D path in numpy - [6/1]
10. Python multiprocessing and networking on Windows - [5/2]

1. Is it possible to break a long function name across multiple lines? - [49/7]
2. What are the names of the magic methods for the operators "is" and "in"? - [15/3]
3. Why does Python 2 allow comparisons between lists and numbers? - [9/3]
4. Why modifying dict during iteration doesn't always raise exception? - [9/3]
5. Why is print("text" + str(var1) + "more text" + str(var2)) described as "disapproved"? - [9/2]
6. Why can Linux accept sockets in multiprocessing? - [9/1]
7. why is len so much more efficient on DataFrame than on underlying numpy array? - [8/2]
8. Why is 'new_file += line + string' so much faster than 'new_file = new_file + line + string'? - [7/2]
9. Python - Create Counter() from mapping, non-integer values - [7/1]
10. Fonts Corrupted - [7/1]

1. Is there a difference between [] and list() when using id()? - [30/1]
2. Why does incorrect assignment to a global variable raise exception early? - [13/3]
3. What is the fastest way to get an arbitrary element out of a Python dictionary? - [12/4]
4. Why can't I import from a module alias? - [10/4]
5. Fastest way to "grep" big files - [9/3]
6. Why is @staticmethod not preserved across classes, when @classmethod is? - [9/2]
7. How to convert a list of strings to list of dictonaries in python? - [6/6]
8. how variable scope works in generators in classes - [6/3]
9. Numpy: make batched version of quaternion multiplication - [6/3]
10. Pandas count consecutive date observations within groupby object - [6/2]

1. All possibilities to split a list into two lists - [12/4]
2. Python: flattening a zip? - [9/4]
3. Python Multiprocessing Pool Doesn't Create Enough Processes - [9/0]
4. Equivalent of Python string.format in Go? - [8/4]
5. What is the most pythonic way to reuse data in multiple calls to same function? - [7/5]
6. Loading a pyspark ML model in a non-Spark enviroment - [7/2]
7. Sort a sublist of elements in a list leaving the rest in place - [6/8]
8. python lowest cost of checking various equalities at once - [6/3]
9. Numpy blockwise reduce operations - [6/2]
10. porting python to scala - [6/2]

1. How do I sort a list with positives coming before negatives with values sorted respectively? - [22/9]
2. Why do Python yield statements form a closure? - [15/4]
3. How big can the input to Pythons input() function be? - [14/2]
4. Why are mutable values in Python Enums the same object? - [13/4]
5. @asyncio.coroutine vs async def - [11/3]
6. '{0}'.format() is faster than str() and '{}'.format() using IPython %timeit and otherwise using pure Python - [10/1]
7. Produce a string from a tuple - [8/7]
8. Python 3 Decimal rounding half down with ROUND_HALF_UP context - [8/3]
9. vectorizing numpy bincount - [7/4]
10. Delete elements of an integer recursively - [7/4]

1. Why does assigning past the end of a list via a slice not raise an IndexError? - [11/2]
2. Can I get a lint error on implicit string joining in python? - [9/3]
3. Generalizing adding nested lists - [9/3]
4. What are the internals of Pythons str.join()? (Hiding passwords from output) - [8/1]
5. Gaussian Fit on noisy and 'interesting' data set - [8/1]
6. Is there a Python shortcut for an __init__ that simply sets properties? - [7/4]
7. Check if an item is in a nested list - [6/5]
8. Meaning of '\0\0' in Python? - [6/3]
9. Grouping Pandas DataFrame by n days starting in the begining of the day - [6/3]
10. Handling empty case with tuple filtering and unpacking - [6/2]

1. Understanding memory allocation for large integers in Python - [23/2]
2. Split python tuple in subtuples with capacity limit in functional programming style - [9/10]
3. sorting list of lists and getting indices in unsorted list - [8/5]
4. Why is True < 2 in Python? - [8/3]
5. How to find the nth derivative given the first derivative with SymPy? - [8/2]
6. Length of longest subarray of sum less than or equal to k - [7/5]
7. How to explain the abstract syntax tree of chained comparison operations? - [7/3]
8. How can I speed up this two-lines code? - [7/1]
9. How do I repeat the last characters of a string in a different string? - [6/7]
10. How to define three methods circularly? - [6/4]

1. Set literal gives different result from set function call - [38/2]
2. Efficiently find whether a string contains a group of characters (like substring but ignoring order)? - [15/8]
3. Putting two keys with the same hash into a dict - [11/3]
4. What is execution model for *args in function call? - [11/2]
5. What is the relationship between the Python data model and built-in functions? - [9/2]
6. Arranging letters in the most pronounceable way? - [9/1]
7. Why will regex "([a-z])((?!\\1)[a-z])" match string "aa" in C++11? - [9/0]
8. What does the "variable //= a value" syntax mean in Python? - [8/3]
9. Python MySQL CSV export to json strange encoding - [8/2]
10. Apply function to 2nd column in pandas dataframe groupby - [8/2]

1. What's the difference between a reversed tuple and a reversed list? - [14/2]
2. Removing elements from an array that are in another array - [11/5]
3. Using a C function in Python - [10/2]
4. Functions, Callable Objects, and how both are created in Python - [9/2]
5. Efficient lookup by common words - [8/2]
6. Order of operations Incorrect? - [8/2]
7. How to use a dict to subset a DataFrame? - [7/5]
8. Is there a way to use itertools in python to clean up nested iterations? - [7/1]
9. Use cases for __init__.py in python 3.3+ - [7/0]
10. How do I pickle a dictionary containing a module & class? - [6/2]

1. Dictionaries are ordered in Python 3.6 - [40/3]
2. list() uses more memory than list comprehension - [36/2]
3. Why does map return a map object instead of a list in Python 3? - [18/4]
4. What are variable annotations in Python 3.6? - [10/2]
5. Correct way to get allowed arguments from ArgumentParser - [7/4]
6. Why does the class definition's metaclass keyword argument accept a callable? - [7/3]
7. Make an object that behaves like a slice - [6/3]
8. Summation of elements of dictionary that are list of lists - [6/3]
9. General way of comparing numerics in Python - [6/3]
10. How to limit the size of pandas queries on HDF5 so it doesn't go over RAM limit? - [6/1]

1. How to make an integer larger than any other integer? - [38/7]
2. Is there a more Pythonic way to combine an Else: statement and an Except:? - [25/6]
3. Why does 1 // 0.1 == 9.0? - [9/1]
4. Find the subset of a set of integers that has the maximum product - [8/4]
5. How can I write a C function that takes either an int or a float? - [8/3]
6. Entries are mirrored throughout list - [8/0]
7. Is it possible to def a function with a dotted name in Python? - [7/2]
8. Organizing list of tuples - [6/7]
9. cryptography AssertionError: sorry, but this version only supports 100 named groups - [6/1]
10. Global name 'camera' is not defined in python - [6/1]

1. How to get lineno of "end-of-statement" in Python ast - [9/0]
2. python's `timeit` doesn't always scale linearly with number? - [8/1]
3. How to identify a string as being a byte literal? - [7/2]
4. Regular Expression Matching First Non-Repeated Character - [7/2]
5. How do coroutines in Python compare to those in Lua? - [7/1]
6. How can i simplify this condition in python? - [6/2]
7. The Pythonic way to grow a list of lists - [6/1]
8. Variable length arguments - [6/1]
9. How to make word boundary \b not match on dashes - [5/3]
10. Identify groups of varying continuous numbers in a list - [5/3]

1. Why does the floating-point value of 4*0.1 look nice in Python 3 but 3*0.1 doesn't? - [85/4]
2. Remove the first N items that match a condition in a Python list - [46/6]
3. Short-circuit evaluation like Python's "and" while storing results of checks - [21/14]
4. Python Recursion Challenge - [13/5]
5. How to maintain different country versions of same language in Django? - [8/1]
6. Why does Python 3 exec() fail when specifying locals? - [8/1]
7. Is there a difference between str function and percent operator in Python - [8/1]
8. How to handle SQLAlchemy Connections in ProcessPool? - [8/0]
9. Python vectorizing nested for loops - [7/2]
10. Double loop takes time - [6/3]

1. What's the closest I can get to calling a Python function using a different Python version? - [13/4]
2. How to traverse cyclic directed graphs with modified DFS algorithm - [11/2]
3. Difference between generators and functions returning generators - [8/3]
4. Why does python's datetime.datetime.strptime('201412', '%Y%m%d') not raise a ValueError? - [8/3]
5. Accessing the choices passed to argument in argparser? - [7/3]
6. Where's the logic that returns an instance of a subclass of OSError exception class? - [7/2]
7. TypeError: str object is not an iterator - [6/7]
8. condensing multiple if statements in python - [6/4]
9. How to fillna() with value 0 after calling resample? - [6/3]
10. How to read strange csv files in Pandas? - [6/3]

1. Why is ''.join() faster than += in python? - [46/2]
2. When should I use list.count(0), and how do I to discount the "False" item? - [15/8]
3. Why does Python's set difference method take time with an empty set? - [10/1]
4. Range as dictionary key in Python - [8/5]
5. How to write conditional code that's compatible with both plain Python values and NumPy arrays? - [8/2]
6. How to run python production on customer environment - [8/1]
7. append zero but not False in a list python - [6/7]
8. How to create a list from another list using specific criteria in Python? - [6/5]
9. How to remap ids to consecutive numbers quickly - [6/3]
10. How to sum and to mean one DataFrame to create another DataFrame - [6/1]

1. Travelling salesman with a directional constraint - [20/1]
2. Is there any reason for giving self a default value? - [18/2]
3. Why does list(next(iter(())) for _ in range(1)) == []? - [11/2]
4. Find all n-dimensional lines and diagonals with NumPy - [10/3]
5. How to subclass list and trigger an event whenever the data change? - [10/1]
6. Build 2 lists in one go while reading from file, pythonically - [9/4]
7. Python os.environ throws key error? - [8/2]
8. What is the time complexity of dict.keys() in Python? - [8/1]
9. Derivative of summations - [7/3]
10. How to add multiple values to a key in a Python dictionary - [7/3]

1. Can a line of Python code know its indentation nesting level? - [52/4]
2. Better way to swap elements in list? - [21/11]
3. Imported a Python module; why does a reassigning a member in it also affect an import elsewhere? - [17/5]
4. How to get a python script to invoke "python -i" when called normally? - [17/5]
5. NumPy performance: uint8 vs. float and multiplication vs. division? - [12/3]
6. Updating a list within a tuple - [10/1]
7. Matching Unicode word boundaries in Python - [10/1]
8. How do I release memory used by a pandas dataframe? - [9/2]
9. Why does printing a dataframe break python when constructed from numpy empty_like - [9/1]
10. Performance between C-contiguous and Fortran-contiguous array operations - [7/2]

1. Function chaining in Python - [32/3]
2. Can a conversion to string raise an error? - [24/4]
3. Remove first encountered elements from a list - [11/7]
4. How can I slice each element of a numpy array of strings? - [11/4]
5. Converting a list into comma-separated string with "and" before the last item - Python 2.7 - [8/6]
6. dplyr summarize equivalent in pandas - [8/1]
7. Automagically propagating deletion when using a bidirectional association_proxy - [8/1]
8. Python - Basic vs extended slicing - [8/1]
9. Coding style (PEP8) - Module level "dunders" - [7/1]
10. What does this strange format string "{[[[]}" do? - [6/1]

1. Οpposite of any() function - [29/4]
2. Splitting a list into uneven groups? - [9/5]
3. good style to introduce python variables within a loop - [9/4]
4. Convert float to string without scientific notation and false precision - [9/2]
5. Set part of a lambda function in advance to avoid repeated code - [8/3]
6. Conversion of list of lists to array of arrays - [7/7]
7. What is the point of calling super in custom error classes in python? - [7/2]
8. decimal.Decimal(n) % 1 returns InvalidOperation, DivisionImpossible for all n >= 100 - [7/1]
9. Transform list with regex - [6/5]
10. How does one debug NaN values in TensorFlow? - [6/3]

1. How to make this Block of python code short and efficient - [18/10]
2. How do I turn a dataframe into a series of lists? - [15/3]
3. Finding patterns in list - [15/1]
4. Slow equality evaluation for identical objects (x == x) - [12/1]
5. Returning string matches between two lists for a given number of elements in a third list - [11/4]
6. A surprise with 1**math.nan and 0j**math.nan - [11/1]
7. Why doesn't except object catch everything in Python? - [11/1]
8. Passing a "pointer to a virtual function" as argument in Python - [10/2]
9. Fastest Way to Compress Video Size Using Library or Algo - [10/1]
10. Is there a specific range of unicode code points which can be checked for emojis? - [8/1]

1. rounding errors in Python floor division - [20/5]
2. 0 is 0 == 0 (#evaluates to True?) - [16/2]
3. Type hint that a function never returns - [9/0]
4. Python: How to delete rows ending in certain characters? - [8/3]
5. Pycharm import RuntimeWarning after updating to 2016.2 - [8/1]
6. Combination of two lists while keeping the order - [7/5]
7. Convert Python sequence to NumPy array, filling missing values - [7/5]
8. Python- np.mean() giving wrong means? - [7/1]
9. Python: get every possible combination of weights for a portfolio - [6/6]
10. Removing duplicate edges from graph in Python list - [6/4]

1. Why and how are Python functions hashable? - [24/3]
2. why is a sum of strings converted to floats - [12/1]
3. Python: PEP 8 class name as variable - [11/2]
4. How to assign member variables temporarily? - [8/5]
5. Simplifying / optimizing a chain of for-loops - [8/4]
6. Is there a pythonic way to process tree-structured dict keys? - [8/2]
7. list of objects python - [8/1]
8. Pandas rolling computations for printing elements in the window - [8/1]
9. django-debug-toolbar breaking on admin while getting sql stats - [8/1]
10. How to free memory of python deleted object? - [8/1]

1. Is there special significance to 16331239353195370.0? - [70/1]
2. Lambdas from a list comprehension are returning a lambda when called - [39/3]
3. Why does '() is ()' return True when '[] is []' and '{} is {}' return False? - [39/1]
4. Why is using str.strip() so much faster than using str.strip(' ')? - [28/2]
5. Tuples: += operator throws exception, but succeeds? - [15/3]
6. Difference between two products nearest to zero: non brute-force solution? - [11/4]
7. Why does `str.format()` ignore additional/unused arguments? - [11/1]
8. Insert element to list based on previous and next elements - [9/3]
9. Why does a Python script to read files cause my computer to emit beeping sounds? - [9/1]
10. Class with changing __hash__ still works with dictionary access - [8/2]

1. Max recursion is not exactly what sys.getrecursionlimit() claims. How come? - [24/3]
2. Create a list of tuples with adjacent list elements if a condition is true - [22/6]
3. Two variables in Python have same id, but not lists or tuples - why? - [20/3]
4. Exception during list comprehension. Are intermediate results kept anywhere? - [16/2]
5. Applications of '~' (tilde) operator in Python - [12/4]
6. Comparison of Pandas lookup times - [12/2]
7. Find unique pairs in list of pairs - [10/4]
8. Understanding this line: list_of_tuples = [(x,y) for x, y, label in data_one] - [9/5]
9. Unpack a Python tuple from left to right? - [9/4]
10. Can generators be recursive? - [9/2]

1. Is there any legitimate use of list[True], list[False] in Python? - [23/3]
2. How do I reliably split a string in Python? - [18/4]
3. Digit separators in Python code - [9/4]
4. Finding an array elements location in a pandas frame column (a.k.a pd.series) - [8/5]
5. Pythonic way to have a function return value in proper units - [7/3]
6. Some emojis (e.g. ☁) have two unicode, u'\u2601' and u'\u2601\ufe0f'. What does u'\ufe0f' mean? Is it the same if I delete it? - [7/2]
7. Random autoboxing/casting when adding to list - [7/0]
8. Django Left Outer Join - [6/5]
9. Regular expression to separate out the last occurring number using Python - [6/5]
10. Implementing an asynchronous iterator - [6/1]

1. Is there a Python constant for Unicode whitespace? - [13/1]
2. Cut within a pattern using Python regex - [10/4]
3. Meaning of '>>' in Python byte code - [10/1]
4. Empty class size in python - [9/2]
5. How to write a complete Python wrapper around a C Struct using Cython? - [8/1]
6. How to write unittests for an optional dependency in a python package? - [7/2]
7. Why does Python's float raise ValueError for some very long inputs? - [7/2]
8. Fast algorithm to find indices where multiple arrays have the same value - [6/4]
9. Identifying consecutive occurrences of a value - [6/3]
10. How to obtain the right alpha value to perfectly blend two images? - [6/2]

1. How to round a number to a chosen integer - [13/9]
2. Variable step in a for loop - [13/7]
3. How can I perform two-dimensional interpolation using scipy? - [12/1]
4. Fast Numpy Loops - [10/4]
5. Trouble with relative / absolute functions import in scikit-image - [8/1]
6. Adding a new column in data frame after calculation on time - [7/2]
7. Sum of Squares - np.inner vs squaring first, then summing - [7/0]
8. Prime number printer stops at 251, why? - [6/8]
9. List of actuals import names in python - [6/3]
10. replace semicolon by newline in python code - [6/2]

1. How can I make sense of the `else` statement in Python loops? - [137/13]
2. How to classify blurry numbers with openCV - [9/2]
3. How to generate permutations of a list without “moving” zeros. in Python - [7/3]
4. Bytecode optimization - [7/2]
5. sorting points to form a continuous line - [7/2]
6. How do Python Recursive Generators work? - [6/3]
7. Why must we declare that a variable is a global variable BEFORE the assignment of that variable? - [6/3]
8. Modifying a dict during iteration - [6/2]
9. Convert exception error to string - [6/1]
10. Selecting values from a JSON file in Python - [6/1]

1. When is hash(n) == n in Python? - [47/4]
2. Why is statistics.mean() so slow? - [32/5]
3. Why is dict definition faster in Python 2.7 than in Python 3.x? - [22/3]
4. What is the advantage of using a lambda:None function? - [12/2]
5. How to find all terms in an expression in Sympy - [9/3]
6. Generating random vectors of Euclidean norm <= 1 in Python? - [9/2]
7. Did I reinvent the wheel with this deduplicating function? - [7/3]
8. Combing 2D list of tuples and then sorting them in Python - [6/3]
9. Class Members -- Java vs. Python - [6/3]
10. Replace division by zero numpy - [6/1]

1. In Python Dictionaries, how does ( (j*5)+1 ) % 2**i cycle through all 2**i - [16/1]
2. How can I create a type hint that my returned list contains strings? - [15/1]
3. Replacing repeated captures - [14/4]
4. 'super' object has no attribute '__eq__' - [10/2]
5. Gauss-Legendre over intervals -x -> infinity: adaptive algorithm to transform weights and nodes efficiently - [9/2]
6. Why are Python 3.6 literal formatted strings so slow? - [8/1]
7. Is a constant list used in a loop constructed/deleted with each pass? - [7/2]
8. pythonic way to index list of objects - [6/4]
9. Efficient Double Sum of Products - [6/3]
10. Memory-Mapping Slows Down Over Time, Alternatives? - [6/2]

1. Why a comparison with a comma at the end "(1,) == 1," gives a tuple "(False,)" in Python? - [64/4]
2. Attributes of Python module `this` - [13/1]
3. What is the x = [m]*n syntax in Python? - [10/2]
4. Is looping through a generator in a loop over that same generator safe in Python? - [9/3]
5. Using python to calculate radial angle, in clockwise/counterclockwise directions, given pixel coordinates (and then vice-versa) - [8/3]
6. How to pad and align unicode strings with special characters in python? - [8/1]
7. Convert redundant array to dict (or JSON)? - [8/1]
8. How can I vectorize and speed up this large array calculation? - [7/3]
9. "Fire and forget" python async/await - [7/2]
10. Merge two or more lists with given order of merging - [7/2]

These are the ten most rated questions at Stack Overflow last week.
Between brackets: [question score / answers count]
Build date: 2016-05-15 09:55:41 GMT

1. Choice made by Python 3.5 to choose the keys when comparing them in a dictionary - [32/6]
2. Why does creating a generator using `()` need a lot of memory? - [23/3]
3. Why is it faster to break rather than to raise an exception? - [17/2]
4. Why does date + timedelta become date, not datetime? - [15/6]
5. In Python: How to remove an object from a list if it is only referenced in that list? - [11/4]
6. Custom chained comparisons - [11/3]
7. "IN" operator with empty strings in Python 3.0 - [10/4]
8. How to have list() consume __iter__ without calling __len__? - [10/2]
9. Return tuple with smallest y value from list of tuples - [10/1]
10. Optimization of arithmetic expressions - what is this technique called? - [10/1]

1. Times two faster than bit shift? - [63/1]
2. Python dictionary doesn't have all the keys assigned, or items - [19/4]
3. How to tell if a single line of python is syntactically valid? - [11/2]
4. Data corruption Piping between C++ and Python - [9/2]
5. Is slicing really slower in Python 3.4? - [9/1]
6. Removing white space from txt with python - [7/5]
7. Schrödinger's variable: the __class__ cell magically appears if you're checking for it's presence? - [7/2]
8. Lambda use case confusion - [7/2]
9. Different result with vectorized code to standard loop in numpy - [6/1]
10. How to crop biggest rectangle out of an image - [6/1]

1. What does Python mean by printing "[...]" for an object reference? - [35/4]
2. Pairwise circular Python 'for' loop - [27/14]
3. In Python, when are two objects the same? - [24/2]
4. Dictionary comprehension with lambda functions gives wrong results - [13/2]
5. How do I identify sequences of values in a boolean array? - [12/3]
6. How int() object using "==" operator without __eq__() method in python2? - [9/2]
7. Why is "import" a statement but "reload" a function? - [9/1]
8. Python Recursive Search of Dict with Nested Keys - [7/5]
9. How to fetch a substring from text file in python? - [7/4]
10. Using generator send() within a for loop - [7/3]

1. Why are Python's arrays slow? - [49/2]
2. Let a class behave like it's a list in Python - [23/4]
3. What exactly is __weakref__ in Python? - [17/3]
4. A decorator for a class method that caches the return after first run - [15/5]
5. On what CPU cores are my Python processes running? - [11/3]
6. Numpy: Why doesn't 'a += a.T' work? - [10/4]
7. Automatic type conversions of user defined classes - [8/1]
8. how to properly overload the __add__ method in python - [8/1]
9. Boring Factorials in python - [8/1]
10. Multiple inputs from one input - [6/4]

1. What does x[x < 2] = 0 mean in Python? - [55/5]
2. Variable assignment faster than one liner - [43/2]
3. How to elegantly cycle a list from alternating sides? - [24/13]
4. Making len() work with instance methods - [17/5]
5. Compare two large dictionaries and create lists of values for keys they have in common - [15/4]
6. Square root of complex numbers in python - [10/2]
7. Understanding == applied to a NumPy array - [9/1]
8. Drawing phase space trajectories with arrows in matplotlib - [9/1]
9. Modifying yield from's return value - [8/3]
10. Python: Matplotlib Surface_plot - [8/1]

1. Why does "www".count("ww") return 1 and not 2? - [31/3]
2. map vs list; why different behaviour? - [10/3]
3. Iterator selector in Python - [9/4]
4. Why does the efficiency of numpy not scale - [8/2]
5. numpy boolean comparison between big arrays returns False instead of boolean array - [8/1]
6. Create a random order of (x, y) pairs, without repeating/subsequent x's - [7/8]
7. Parsing large amount of dates with pandas - scalability - performance drops faster than linear - [7/2]
8. Why do file permissions show different in Python and bash? - [7/1]
9. More Pythonic way of adding attributes to class? - [6/4]
10. Go c-shared library callback into other languages - [6/2]

1. All possible ways to interleave two strings - [17/5]
2. Return self in python - [17/4]
3. Why can't I break out of this itertools infinite loop? - [9/1]
4. Natural way to code a composition of a tree of functions? - [8/5]
5. "OverflowError: Allocated too many blocks": - [8/0]
6. Most efficient way to delete needless newlines in Python - [7/3]
7. Denormalize unit vector - [7/2]
8. High performance array mean - [7/1]
9. Is this Python "static variable" hack ok to use? - [6/4]
10. Concatenate tuple with variable - [6/2]

These are the ten most rated questions at Stack Overflow last week.
Between brackets: [question score / answers count]
Build date: 2016-03-25 15:48:15 GMT

1. Pythonic way to avoid "if x: return x" statements - [143/14]
2. Why is a double semicolon a SyntaxError in Python? - [58/2]
3. More efficient use of Python dictionary? - [27/3]
4. How to call a function with a dictionary that contains more items than the function has parameters? - [24/6]
5. Python the same char not equals - [11/1]
6. Difference between "raise" and "raise e"? - [11/1]
7. why are empty numpy arrays not printed - [6/3]
8. Understanding threading - [6/2]
9. Search list of string elements that match another list of string elements - [6/2]
10. Genetic Algorithm: Higher Mutation Rate leads to lower run time - [6/2]

1. Counterintuitive behaviour of int() in python - [31/5]
2. Is there a need to close files that have no reference to them? - [30/6]
3. Why did Django 1.9 replace tuples () with lists [] in settings and URLs? - [22/2]
4. Edit the value of every Nth item in a list - [12/7]
5. What is a DynamicClassAttribute and how do I use it? - [10/1]
6. Class inheritance in python - [8/10]
7. Returning Dictionary-length of words in string - [8/7]
8. Python 'with' not deleting object - [7/4]
9. Linear shift between 2 sets of coordinates - [7/3]
10. Sum of multiple list of lists index wise - [7/3]

1. sine calculation orders of magnitude slower than cosine - [25/2]
2. Python eval: is it still dangerous if I disable builtins and attribute access? - [17/4]
3. Cleanest way to obtain the numeric prefix of a string - [16/7]
4. Python 3: super() raises TypeError unexpectedly - [14/2]
5. `object in list` behaves different from `object in dict`? - [13/2]
6. how to print 3x3 array in python? - [12/7]
7. Is there a one line code to find maximal value in a matrix? - [9/4]
8. Unpacking arguments from argparse - [9/3]
9. Python Iterate through list of list to make a new list in index sequence - [7/4]
10. What's the best way to "periodically" replace characters in a string in Python? - [7/3]

1. Python: understanding class and instance variables - [24/5]
2. Find tuple structure containing an unknown value inside a list - [23/7]
3. module imports and __init__.py in Python - [14/4]
4. Find first item with alphabetical precedence in list with numbers - [9/3]
5. Why do dict keys support list subtraction but not tuple subtraction? - [9/1]
6. 'For' loop behaviour in Python - [8/1]
7. How to quickly find first multiple of 2 of list element in list of large integers? - [7/4]
8. Explain the difference between these Midpoint Algorithms - [7/2]
9. pandas: FloatingPointError with np.seterr(all='raise') and missing data - [7/1]
10. Why is there a performance difference between the order of a nested loop? - [7/1]

1. How to check if two permutations are symmetric? - [17/11]
2. Merging Key-Value Pairings in Dictionary - [16/3]
3. Loop while checking if element in a list in Python - [15/1]
4. Python - If not statement with 0.0 - [14/5]
5. Using python decorator with or without parentheses - [14/1]
6. An Object is created twice in Python - [11/2]
7. What technical limitations prevent the calculation of Graham's number in python? - [11/1]
8. How to print this pattern? I cannot get the logic for eliminating the middle part - [10/5]
9. Why does bit-wise shift left return different results in Python and Java? - [10/3]
10. check if two lists are equal by type Python - [8/4]

1. How to get the number of all the keys in a dictionary of dictionaries in Python - [28/10]
2. What can `__init__` do that `__new__` cannot? - [19/3]
3. Can I use index information inside the map function? - [15/3]
4. argparse: some mutually exclusive arguments in required group - [12/3]
5. Setting up the EB CLI - error nonetype get_frozen_credentials - [10/5]
6. How do I search a list that is in a nested list (list of list) without loop in Python? - [10/4]
7. Break statement in finally block swallows exception - [9/3]
8. Find all possible substrings begining with characters from capturing group - [8/4]
9. Apply the order of list to another lists - [8/2]
10. Python number print formatting using %.*g - [8/2]

1. Can you create a Python list from a string, while keeping characters in specific keywords together? - [23/2]
2. In python, how do I cast a class object to a dict - [20/5]
3. Print letters in specific pattern in Python - [16/5]
4. Find elements that occur in some but not all lists - [12/3]
5. Find the second smallest number in a list using recursion - [10/7]
6. Get ordered list of attributes of a Python module - [10/2]
7. How to sort an array of integers faster than quicksort? - [9/3]
8. Difference in "dir" between Python 2 and 3 - [9/3]
9. pythonic way for axis-wise winner-take-all in numpy - [9/2]
10. Create possible combinations of specific size - [8/5]

1. How do I avoid the "self.x = x; self.y = y; self.z = z" pattern in __init__? - [72/6]
2. Why do 3 backslashes equal 4 in a Python string? - [68/4]
3. Python keyword arguments unpack and return dictionary - [14/4]
4. Is there a pythonic way to cancel a decoration on a subclass' method? - [14/2]
5. Why do different methods of same object have the same `id`? - [12/4]
6. Fast way of crossing strings in a list - [12/3]
7. Why is len(<a list object>) so slow? - [12/1]
8. Subtraction over a list of sets - [10/4]
9. Finding anonymous enums with libclang - [10/1]
10. Multi-threaded integer matrix multiplication in NumPy/SciPy - [10/0]

1. Why is max slower than sort in Python? - [63/3]
2. Difference between a -= b and a = a - b in Python - [44/3]
3. Why does 'range(0) == range(2, 2, 2)' equal True? - [28/5]
4. How to remove adjacent duplicate elements in a list using list comprehensions? - [14/5]
5. How do I transform a multi-level list into a list of strings in Python? - [12/3]
6. Python - Plotting velocity and acceleration vectors at certain points - [10/1]
7. Why attribute lookup in Python is designed this way (precedence chain)? - [9/3]
8. Softmax function - python - [8/2]
9. Scaling and fitting to a log-normal distribution using a logarithmic axis in python - [8/2]
10. completely self-contained virtual environment - [8/1]

1. Is unsetting a single bit in flags safe with Python variable-length integers? - [27/2]
2. What causes the '' in ['h', 'e', 'l', 'l', 'o', ''] when you do re.findall('[\w]?', 'hello') - [23/2]
3. How can I convert an absolutely massive number to a string in a reasonable amount of time? - [18/4]
4. What does "list comprehension" in Python mean? How does it work and how can I use it? - [17/3]
5. What happens in degenerate case of multiple assignment? - [13/3]
6. Comprehensions in Python to sample from list - [13/1]
7. Seeking Elegant Python Dice Iteration - [13/1]
8. What is the proper way to determine if an object is a bytes-like object in Python? - [11/4]
9. Python: optimal search for substring in list of strings - [9/4]
10. Enumerating three variables in python list comprehension - [9/4]

1. Most pythonic way to interleave two strings - [38/10]
2. Python with...as for custom context manager - [19/3]
3. Python: Splat/unpack operator * in python cannot be used in an expression? - [16/3]
4. Python for loop and iterating through lists - [15/2]
5. Updating a sliced list - [14/4]
6. Recursive factorial using dict causes RecursionError - [12/1]
7. Calling list() empties my iterable object? - [12/6]
8. Difference between coroutine and future/task in Python 3.5? - [11/1]
9. Merge lists in Python by placing every nth item from one list and others from another? - [10/7]
10. Using multiple web pages in a web scraper - [9/1]

1. Why does Python allow function calls with wrong number of arguments? - [66/2]
2. Are objects with the same id always equal when comparing them with ==? - [43/3]
3. What's the point of Django's collectstatic? - [19/4]
4. the path complexity (fastest route) to any given number in python - [16/4]
5. Dict/Set Parsing Order Consistency - [15/2]
6. List comprehension as substitute for reduce() in Python - [12/1]
7. Recursively replace characters in a dictionary - [11/2]
8. Insert 0s into 2d array - [11/6]
9. Why does enumerate execute slower when specifying start? - [10/2]
10. Finding all occurrences of alternating digits using regular expressions - [9/4]