Range of integers cached by Python

PyIntCacheRange.py

# Python caches a small range of integers (objects)
# This is implementation specific and can be discovered easily

import platform

cacheBegin, cacheEnd = 0, 0

for i in range( -500, 0 ):
    if i is int(str(i)):
        cacheBegin = i
        break

for i in range( cacheBegin, 500 ):
    if i is not int(str(i)):
        cacheEnd = i - 1
        break

print( "Python version: {} implementation: {}".format( platform.python_version(), platform.python_implementation() ) )
print( "This implementation caches integers {} to {}".format( cacheBegin, cacheEnd ) )