The codematch = re.search(pat, str)stores the search result in a variable named "match". Then the if-statement tests the match -- if true the search succeeded and match.group() is the matching text (e.g. 'word:
Enum string comparison To compare a string with an enum, extend from thestrclass when declaring your enumeration class, e.g.class Color(str, Enum):. You will then be able to compare a string to an enum member using the equality operator==. How to compare a string with an Enum in Pyt...
finally块中的所有语句执行后,异常被再次提出,并执行except块代码。 7、with语句 用来代替try-except-finally语句,使代码更加简洁 with context[as var]: with_suite context表达式返回是一个对象 var用来保存context返回对象,单个返回值或元组 with_suite使用var变量...
一个正则括号的不捕获版本.Matches whatever regular expression is inside the parentheses, but the substring matched by the groupcannotbe retrieved after performing a match or referenced later in the pattern. (?P<name>...) 和正则括号相似, 但是这个组匹配到的子字符串可以通过符号组名称name进行访问.组...
regex.match(string[, pos[, endpos]]) I 如果在零个或多个字符开头的字符串匹配这个正则表达式,返回相应的匹配对象。如果返回 None,则该字符串不匹配模式;注意这不同于一个零字节长度的匹配。 可选的POS和endpos参数的含义与对于相同的search()方法。 >>> >>> pattern = re.compile("o") >>> pattern....
Regex: 正则表达式 import re判断是否匹配 re.match(r'^[aeiou]', str) 以第二个参数指定的字符替换原字符串中内容 re.sub(r'^[aeiou]', '?', str) re.sub(r'(xyz)', r'\1', str)编译生成独立的正则表达式对象 expr = re.compile(r'^...$') expr.match(...) expr.sub(...) 下面列举...
html_regex = esm.compile(r'<[^>]+>') text = 'This is a bold statement.' matches = html...
Scans a string for a regex match.If you worked through the previous tutorial in this series, then you should be well familiar with this function by now. re.search(<regex>, <string>) looks for any location in <string> where <regex> matches:Python >>> re.search(r'(\d+)', 'foo...
Here, theassertstatement in the code checks thatnumis an even number; if num is odd, it raises anAssertionError, triggering the except block. Note: Exceptions in theelseclause are not handled by the preceding except clauses. Python try...finally ...
import re regex = re.compile(r'coop') # 正则匹配替换 regex.sub('$$$','sdlaf