Return value: New reference.Return a new PyIntObject or PyLongObject based on the string
value in str, which is interpreted according to the radix in base. If
pend is non-NULL, *pend will point to the first character in str which
follows the representation of the number. If base is 0, the radix will be
determined based on the leading characters of str: if str starts with
'0x' or '0X', radix 16 will be used; if str starts with '0', radix
8 will be used; otherwise radix 10 will be used. If base is not 0, it
must be between 2 and 36, inclusive. Leading spaces are ignored. If
there are no digits, ValueError will be raised. If the string represents
a number too large to be contained within the machine’s long int type
and overflow warnings are being suppressed, a PyLongObject will be
returned. If overflow warnings are not being suppressed, NULL will be
returned in this case.