Python在特殊字符和单词之间添加空格

Question

I am working on a data science project and I have an issue. I have an array full of string like the following string and I want to add a space between the words and between the special characters

sentence[i] = 'This is a⓵⓶⓷string'

and I expect something like that:

sentence[i] = 'This is a ⓵ ⓶ ⓷ string'

My last try:

l=[]
for i in lines:
    for j in i:
        if j.isalpha() == False:
            l.append(i.split())
        else:
            l.append(i)

print(l)

for i in l:
    s = ' '.join(i)

Answer 1

You could simply scan the complete line and selectively add space for each character that is neither alphabet nor a space.

s = 'This is a⓵⓶⓷string'
t = ''
for x in s :
    if not str.isalpha(x) and x != ' ' :
        if t[-1] != ' ':
            t+= ' '
        t += x
        t += ' '
    else: t += x

this works for example you have given.

Answer 2

使用正则表达式来完成该任务，特别是将re.sub与反向引用一起使用，以便将匹配的字符用空格包围。