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Problem :

While I am running the python code on windows with python 3.5 64 bit. Getting below error.

 overflowerror: python int too large to convert to c long

6.9k points

2 Answers

0 votes

Solution :

The issue is because the numbers are greater than sys.maxsize:

>>> p = [sys.maxsize]
>>> preds[0] = p
>>> p = [sys.maxsize+1]
>>> preds[0] = p
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
OverflowError: Python int too large to convert to C long

Please confirm this by checking:

>>> import sys >>> sys.maxsize 

To resolve the issue use the default float:

>>> preds = np.zeros((1, 3))

Further Readings:


36.1k points
edited by
0 votes

In python 2, a Python int is equivalent to a C long data type. In python 3 an int is an arbitrary precision type but the numpy can still use it to represent the C type “long” while creating the array.


The size of a C long is platform dependent. On the Windows operating system it is always 32 bits. On Linux operating systems it behaves as 32 bits on 32 bits systems and 64 bits on 64 bits systems.


So it is suggested that choose a platform-independent data type. Probably this would be the most sensible choice in np.int64.


For example, you are getting this error when your numbers are greater than sys.maxsize

>>> p = [sys.maxsize]

>>> preds[0] = p

>>> p = [sys.maxsize+1]

>>> preds[0] = p


Traceback (most recent call last):

       File “<stdin>”, lin1, in <module>

OverflowError: Python int too large to convert to C long


You can confirm this by using the following code;

>>> import sys

>>> sys.maxsize



To use the numbers with large precision, never use an int type which uses a bounded C integer behind the scenes. For this purpose use the default float value;

>>> preds = np.zeros((1, 3))


3.9k points

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