python中快速进行多个字符替换的方法小结
先给出结论:
- 要替换的字符数量不多时,可以直接链式
replace()
方法进行替换,效率非常高; - 如果要替换的字符数量较多,则推荐在 for 循环中调用
replace()
进行替换。
可行的方法:
1. 链式replace()
string.replace().replace()
1.x 在for
循环中调用replace()
「在要替换的字符较多时」
2. 使用string.maketrans
3. 先 re.compile 然后 re.sub
……
def a(text): chars = "" for c in chars: text = text.replace(c, "\\" + c) def b(text): for ch in ['&','#']: if ch in text: text = text.replace(ch,"\\"+ch) import re def c(text): rx = re.compile('([])') text = rx.sub(r'\\\1', text) RX = re.compile('([])') def d(text): text = RX.sub(r'\\\1', text) def mk_esc(esc_chars): return lambda s: ''.join(['\\' + c if c in esc_chars else c for c in s]) esc = mk_esc('') def e(text): esc(text) def f(text): text = text.replace('&', '\&').replace('#', '\#') def g(text): replacements = {"&": "\&", "#": "\#"} text = "".join([replacements.get(c, c) for c in text]) def h(text): text = text.replace('&', r'\&') text = text.replace('#', r'\#') def i(text): text = text.replace('&', r'\&').replace('#', r'\#')
参考链接:
http://stackoverflow.com/questions/3411771/multiple-character-replace-with-python
http://stackoverflow.com/questions/6116978/python-replace-multiple-strings
http://stackoverflow.com/questions/8687018/python-string-replace-two-things-at-once
http://stackoverflow.com/questions/28775049/most-efficient-way-to-replace-multiple-characters-in-a-string
总结
以上就是这篇文章的全部内容了,希望本文的内容对大家学习或者使用python能有所帮在,如果有疑问大家可以留言交流。
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