Python3 表达式增量的替代方法

Question

Imagine, I have index = 0 , hash = '06123gfhtg75677687fgfg4' and I want to process expression like hash[i++] . How to do this in Python3 ?

Notice, I need index = 1 after this expression. I need one-line expression, if possible.

Expected usage below:

enc = bytes(enc % len(session_key))
x = bytes(data[i] ^ session_key[enc++]) + ej)
data[i] = ej = x

Answer 1

You could use itertools.count() object, with next to give the current value and increment it. That would emulate ++ postfix C/C++ operator properly.

Example:

import itertools

c = itertools.count()  # starts at 0, but can be passed a start value as argument

s = 'abc'
print(s[next(c)])
print(s[next(c)])
print(s[next(c)])

prints a,b,c in sequence.