Py css样式 rem转prx

import re

def convert_rem_to_rpx(css_string, ratio=200):
    def replace(match):
        rem_value = float(match.group(1))
        rpx_value = rem_value * ratio
        return f'{int(round(rpx_value))}rpx'

    pattern = r'(\d*\.?\d+)\s*rem'
    converted_css = re.sub(pattern, replace, css_string)
    return converted_css

input_file = 'input.css'
output_file = 'output.css'
with open(input_file, 'r', encoding='utf-8') as f:
    css_string = f.read()
    converted_css = convert_rem_to_rpx(css_string)

with open(output_file, 'w', encoding='utf-8') as f:
    f.write(converted_css)