python - 替换 Python 3.1 中字符串中的重复字符

Question

是否可以替换出现多次的字符串中的单个字符？

输入:

Sentence=("This is an Example. Thxs code is not what I'm having problems with.") #Example input
                                 ^
Sentence=("This is an Example. This code is not what I'm having problems with.") #Desired output

将“Thxs”中的“x”替换为i，而不替换“Example”中的x.

Answer 1

您可以通过包含一些上下文来做到这一点:

s = s.replace("Thxs", "This")

---

或者，您可以保留您不想替换的单词列表:

whitelist = ['example', 'explanation']

def replace_except_whitelist(m):
    s = m.group()
    if s in whitelist: return s
    else: return s.replace('x', 'i')

s = 'Thxs example'
result = re.sub("\w+", replace_except_whitelist, s)
print(result)

输出:

This example