给定整数参数Python时的字符串操作 [英] String manipulation when given an integer parameter Python

问题描述

我正在处理SVG文件. 我将此字符串作为样式

I am manipulating an SVG file. I have this string as a style

'.cls-1{fill:#755841;}.cls-2{fill:#f7c394;}.cls-3{fill:#9b7657;}.cls- 
4{fill:#7f6145;}.cls-5{fill:#ffc9a1;}.cls-6{fill:#ffcd98;}.cls- 
7{fill:#3d0c0c;}.cls-8{fill:#fff;}.cls-9{fill:#313cc4;}'

我想创建一个接收输入说14的函数，并将此字符串更改为从输入连续的数字开始.例如，这里的课程将从14 + 1 = 15开始，依此类推:

I want to create a function that receives an input say 14 and changes this string to start at a number that is continuing from the input. For example here classes will start from 14 + 1 = 15 and so on:

'.cls-15{fill:#755841;}.cls-16{fill:#f7c394;}.cls-17{fill:#9b7657;}.cls- 
18{fill:#7f6145;}.cls-19{fill:#ffc9a1;}.cls-20{fill:#ffcd98;}.cls- 
21{fill:#3d0c0c;}.cls-22{fill:#fff;}.cls-23{fill:#313cc4;}'

不太确定哪种方法最好.是正则表达式吗?

Not really sure what will be the best approach. Is it regex?

推荐答案

嗯，字符串实际上是CSS代码.如何使用python CSS解析器解析它，然后实用地访问生成的对象?

Well, the string is actually CSS code. How about parsing it with a python CSS parser and then access the resulting objects pragmatically?

使用 cssutils :链接

import cssutils

css = '.cls-1{fill:#755841;}.cls-2{fill:#f7c394;}.cls-3{fill:#9b7657;}.cls-4{fill:#7f6145;}.cls-5{fill:#ffc9a1;}.cls-6{fill:#ffcd98;}.cls-7{fill:#3d0c0c;}.cls-8{fill:#fff;}.cls-9{fill:#313cc4;}'

sheet = cssutils.parseString(css)

for rule in sheet:
    text = rule.selectorText.split('-')
    name,num = text
    num = int(num)
    num += 10

    rule.selectorText = name + '-' + str(num)        

print sheet.cssText.translate(None, ' \n\t\r')

输出:

.cls-11{fill:#755841}.cls-12{fill:#f7c394}.cls-13{fill:#9b7657}.cls-14{fill:#7f6145}.cls-15{fill:#ffc9a1}.cls-16{fill:#ffcd98}.cls-17{fill:#3d0c0c}.cls-18{fill:#fff}.cls-19{fill:#313cc4}

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