How do I get an empty array of any size in python

Question

I basically want a python equivalent of this in C   int a x     but in python I declare an array like   a        and the problem is I want to assign random slots with values like   a 4    1   but I can t do that with python  since the array is empty

User · Answer

also you can extend that with extend method of list   a     a extend  None  10  a extend  None  20

User · Answer

If you  or other searchers of this question  were actually interested in creating a contiguous array to fill with integers  consider bytearray and memoryivew     cast   is available starting Python 3 3 size   10  6  ints   memoryview bytearray size   cast  i     ints contiguous  ints itemsize  ints shape    True  4   250000     ints 0    0  ints 0    16 ints 0    16

User · Answer

If you actually want a C-style array  import array a   array array  i   x    0   a 3    5 try      5     a  except TypeError     print  integers only allowed     Note that there s no concept of un-initialized variable in python  A variable is a name that is bound to a value  so that value must have something  In the example above the array is initialized with zeros   However  this is uncommon in python  unless you actually need it for low-level stuff  In most cases  you are better-off using an empty list or empty numpy array  as other answers suggest

User · Answer

x    for i in range 0 5       x append i      print x i

User · Answer

You can use numpy   import numpy as np   Example from Empty Array   np empty  2  2   array    -9 74499359e 001    6 69583040e-309             2 13182611e-314    3 06959433e-309

User · Answer

You can t do exactly what you want in Python  if I read you correctly    You need to put values in for each element of the list  or as you called it  array    But  try this   a    0 for x in range N      N   size of list you want a i    5    as long as i  lt  N  you re okay   For lists of other types  use something besides 0   None is often a good choice as well

User · Answer

Just declare the list and append each element  For ex   a      a append  first item   a append  second item

User · Answer

If by  array  you actually mean a Python list  you can use  a    0    10   or  a    None    10

[python] How do I get an empty array of any size in python?

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