Python 字符串（'$' 后跟字符而不是数字）

Question

May I ask if I just want to filter all the string of "$" followed by characters but not those followed by numbers, what python codes should I modify based on the following codes I have? Thanks.

def color_negative_red(value):
    if '$' in value:
        color = 'red'
 
    else:
        color = 'black'

    return 'color: %s' % color

Dataframe = Dataframe.style.applymap(color_negative_red, subset=['column_1'])

Answer 1

You could use regex and specifically a lookahead assertion:

import re

if re.search(r'\$(?=[A-Za-z]+)', value):
    color = 'red'

This will find any letter character following a $ except digits.