在for循环中测试索引-Python[重复]-Testinganindexinaforloop-Python[duplicate]

Very simple problem, although I am having quite a tough time solving it.

很简单的问题，虽然我很难解决它。

Take a look at the code and I will explain below:

看看代码，我将在下面解释：

def printc(some_text):
    split_text = list(some_text)

    for x in split_text:
        if x is '{'
            # this is what i need help with


printc("{CCyan, {RRed, {YYello)

The idea behind this and it is still very early in the code development, but what I am trying to do is create an iterator that searches through "split_text" and finds the character '{' then i want to test what character is situated right next to it. How would i go about doing that?

这背后的想法，它仍然是代码开发的早期，但我想要做的是创建一个迭代器，搜索“split_text”并找到字符'{'然后我想测试下一个字符是什么它。我该怎么做呢？

For example is searches through split_text and finds the first { i want to see if the character next to it is either A, B, C, etc...

例如，通过split_text搜索并找到第一个{我想看看它旁边的字符是A，B，C等...

Any ideas?

有任何想法吗？

3 个解决方案

import re
re.findall('{(.)', some_text)

['C', 'R', 'Y']

for x, y in zip(some_text, some_text[1:]):
    if x == '{':
        print y

chars = [y for (x, y) in zip(some_text, some_text[1:]) if x == '{']

from itertools import tee, izip

def pairwise(iterable):
    """Iterate in pairs

    >>> list(pairwise([0, 1, 2, 3]))
    [(0, 1), (1, 2), (2, 3)]
    >>> tuple(pairwise([])) == tuple(pairwise('x')) == ()
    True
    """
    a, b = tee(iterable)
    next(b, None)
    return izip(a, b)

for left, right in pairwise(iterable):
    ...