Python3：使用正则表达式拆分+连接字符串-给出语法错误：无法分配给运算符

Question

I am attempting to use a regex to split and concatenate a string but am getting an error message... as I can't see the problem, I am a little lost as to what to do.

code:

import re
s = 'Defect centre is at   0.0000   0.0000   0.2984  Frac'
M-L_centre = ' '.join(re.finditer('[\d.]+', s))

gives:

SyntaxError: can't assign to operator

the intended result would be:

M-L_centre = '0.0000 0.0000 0.2984'

Answer 1

M-L_centre中带有连字符，因此它是算术表达式而不是变量（或您想要的任何变量），因此您无法为其分配值。