Python：将括号替换为减号列表

Question

A= ['(100)','(98.2)', '400', '500']

How to replace the list that number with brackets with minus sign? I prefer a simple one line code.

The desired output as below:

A= ['-100','-98.2', '400', '500']

My way is very lengthily

if '(' in A[0]:
      A[0] = -float(A[0].translate(None,"(),"))

Answer 1

Option 1
str.strip + a list comprehension .

>>> ['-' + y.strip('()') if '(' in y else y for y in A]
['-100', '-98.2', '400', '500']

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Option 2
Modifying the first method with a map + lambda .

>>> list(map(lambda y: '-' + y.strip('()') if '(' in y else y, A))
['-100', '-98.2', '400', '500']

Personally, I prefer the list comprehension.

Answer 2

You could also use regex, pretty nice-

import re
res = [re.sub(r"\((.*)\)", r"-\1", x) for x in orig]