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  • How do I declare an array in Python? - Stack Overflow
    @AndersonGreen As I said there's no such thing as a variable declaration in Python You would create a multidimensional list by taking an empty list and putting other lists inside it or, if the dimensions of the list are known at write-time, you could just write it as a literal like this: my_2x2_list = [[a, b], [c, d]]
  • python - What does [:, :] mean on NumPy arrays - Stack Overflow
    numpy uses tuples as indexes In this case, this is a detailed slice assignment [0] #means line 0 of your matrix [(0,0)] #means cell at 0,0 of your matrix [0:1] #means lines 0 to 1 excluded of your matrix [:1] #excluding the first value means all lines until line 1 excluded [1:] #excluding the last param mean all lines starting form line 1 included [:] #excluding both means all lines [::2] #
  • Python list vs. array – when to use? - Stack Overflow
    array array is also a reasonable way to represent a mutable string in Python 2 x (array('B', bytes)) However, Python 2 6+ and 3 x offer a mutable byte string as bytearray However, if you want to do math on a homogeneous array of numeric data, then you're much better off using NumPy, which can automatically vectorize operations on complex
  • python - Check if item is in an array list - Stack Overflow
    I'm also going to assume that you mean "list" when you say "array " Sven Marnach's solution is good If you are going to be doing repeated checks on the list, then it might be worth converting it to a set or frozenset, which can be faster for each check
  • python - array. array versus numpy. array - Stack Overflow
    In defense of array array, I think its important to note that it is also a lot more lightweight than numpy array, and that saying 'will do just fine' for a 1D array should really be 'a lot faster, smaller, and works in pypy cython without issues '
  • python - What does [:] mean? - Stack Overflow
    used for limiter or slicing in array , hash eg: [1:5] for displaying values between 1 inclusive and 5 exclusive i e 1-4 [start:end] basically used in array for slicing , understand bracket accept variable that mean value or key to display, and " : " is used to limit or slice the entire array into packets
  • How to declare and add items to an array in Python
    Python's array module The standard library also has the array module, which is a wrapper over C arrays Like C arrays, array array objects hold only a single type (which has to be specified at object creation time by using a type code), whereas Python list objects can hold anything
  • How to create an integer array in Python? - Stack Overflow
    Use the array module With it you can store collections of the same type efficiently >>> import array >>> import itertools >>> a = array_of_signed_ints = array array("i", itertools repeat(0, 10)) For more information - e g different types, look at the documentation of the array module For up to 1 million entries this should feel pretty snappy
  • python: how to identify if a variable is an array or a scalar
    Unfortunately, there is nothing in Python's collections abc that checks for only __len__ and __getitem__ which I feel are minimal methods for array-like objects It works on list, tuple, ndarray, Tensor etc





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