我是不是错过了重点，或者仅仅是以下几点:

string = "ab1cd1ef"
string = string.replace("1", "") 

print(string)
# result: "abcdef"

把它放入循环:

a = "a!b@c#d$"
b = "!@#$"
for char in b:
    a = a.replace(char, "")

print(a)
# result: "abcd"

提问者几乎就说到了。像Python中的大多数事情一样，答案比您想象的要简单。

>>> line = "H E?.LL!/;O:: "  
>>> for char in ' ?.!/;:':  
...  line = line.replace(char,'')  
...
>>> print line
HELLO

你不需要做嵌套的if/for循环，但你确实需要单独检查每个字符。

字符串方法replace不会修改原始字符串。它保留原始文件并返回修改后的副本。

你需要的是这样的:line = line.replace(char， ")

def replace_all(line, )for char in line:
    if char in " ?.!/;:":
        line = line.replace(char,'')
    return line

然而，每次删除一个字符都创建一个新的字符串是非常低效的。我推荐以下方法:

def replace_all(line, baddies, *):
    """
    The following is documentation on how to use the class,
    without reference to the implementation details:

    For implementation notes, please see comments begining with `#`
    in the source file.

    [*crickets chirp*]

    """

    is_bad = lambda ch, baddies=baddies: return ch in baddies
    filter_baddies = lambda ch, *, is_bad=is_bad: "" if is_bad(ch) else ch
    mahp = replace_all.map(filter_baddies, line)
    return replace_all.join('', join(mahp))

    # -------------------------------------------------
    # WHY `baddies=baddies`?!?
    #     `is_bad=is_bad`
    # -------------------------------------------------
    # Default arguments to a lambda function are evaluated
    # at the same time as when a lambda function is
    # **defined**.
    #
    # global variables of a lambda function
    # are evaluated when the lambda function is
    # **called**
    #
    # The following prints "as yellow as snow"
    #
    #     fleece_color = "white"
    #     little_lamb = lambda end: return "as " + fleece_color + end
    #
    #     # sometime later...
    #
    #     fleece_color = "yellow"
    #     print(little_lamb(" as snow"))
    # --------------------------------------------------
replace_all.map = map
replace_all.join = str.join

用re.sub正则表达式

从Python 3.5开始，可以使用正则表达式re.sub进行替换:

import re
re.sub('\ |\?|\.|\!|\/|\;|\:', '', line)

例子

import re
line = 'Q: Do I write ;/.??? No!!!'
re.sub('\ |\?|\.|\!|\/|\;|\:', '', line)

'QDoIwriteNo'

解释

在正则表达式(regex)中，|是一个逻辑或，\转义可能是实际的正则表达式命令的空格和特殊字符。而sub代表替换，在这种情况下是空字符串”。

我是不是错过了重点，或者仅仅是以下几点:

string = "ab1cd1ef"
string = string.replace("1", "") 

print(string)
# result: "abcdef"

把它放入循环:

a = "a!b@c#d$"
b = "!@#$"
for char in b:
    a = a.replace(char, "")

print(a)
# result: "abcd"

>>> s = 'a1b2c3'
>>> ''.join(c for c in s if c not in '123')
'abc'