OverflowError Python int too large to convert to C long on windows but not mac

Question

I am running the exact same code on both windows and mac  with python 3 5 64 bit    On windows  it looks like this    gt  gt  gt  import numpy as np  gt  gt  gt  preds   np zeros  1  3   dtype int   gt  gt  gt  p    6802256107  5017549029  3745804973   gt  gt  gt  preds 0    p Traceback  most recent call last     File   lt pyshell 13 gt    line 1  in  lt module gt      preds 0    p OverflowError  Python int too large to convert to C long   However  this code works fine on my mac  Could anyone help explain why or give a solution for the code on windows  Thanks so much

User · Answer

You can use dtype np int64 instead of dtype int

User · Answer

You ll get that error once your numbers are greater than sys maxsize    gt  gt  gt  p    sys maxsize   gt  gt  gt  preds 0    p  gt  gt  gt  p    sys maxsize 1   gt  gt  gt  preds 0    p Traceback  most recent call last     File   lt stdin gt    line 1  in  lt module gt  OverflowError  Python int too large to convert to C long   You can confirm this by checking    gt  gt  gt  import sys  gt  gt  gt  sys maxsize 2147483647   To take numbers with larger precision  don t pass an int type which uses a bounded C integer behind the scenes  Use the default float    gt  gt  gt  preds   np zeros  1  3

User · Answer

Could anyone help explain why    In Python 2 a python  int  was equivalent to a C long  In Python 3 an  int  is an arbitrary precision type but numpy still uses  int  it to represent the C type  long  when creating arrays   The size of a C long is platform dependent  On windows it is always 32-bit  On unix-like systems it is normally 32 bit on 32 bit systems and 64 bit on 64 bit systems      or give a solution for the code on windows  Thanks so much    Choose a data type whose size is not platform dependent  You can find the list at https   docs scipy org doc numpy reference arrays scalars html arrays-scalars-built-in  the most sensible choice would probably be np int64

[python] "OverflowError: Python int too large to convert to C long" on windows but not mac

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