Python字符串具有许多有用的方法。
一种这样的方法是替换方法。

使用此方法，我们可以用另一个字符或者子字符串替换特定字符或者子字符串。

让我们来看看一个例子。

s = "Hello World, Welcome to my blog."
print(s)
s1 = s.replace('W', 'V')
print(s1)

删除标点符号：

user_comment = "NGL, i just loved the moviee...... excellent work !!!"
print(f"input string: {user_comment}")
clean_comment = user_comment #copy the string in new variable, we'll store the result in this variable
# define list of punctuation to be removed
punctuation = ['.','.','!']
# iteratively remove all occurrences of each punctuation in the input
for p in punctuation:
    clean_comment = clean_comment.replace(p,'') #not specifying 3rd param, since we want to remove all occurrences
print(f"clean string: {clean_comment}")