Integer Caching in Python

import platform
cacheBegin, cacheEnd = 0, 0
print(cacheBegin)
print(cacheEnd)
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 ) )

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