How to Check if a Python String Contains a Substring In this quiz, you'll check your understanding of the best way to check whether a Python string contains a substring. You'll also revisit idiomatic ways to inspect the substring further, match substrings with conditions using regular expressio...
re.IGNORECASE (re.I): This flag makes the search case-insensitive, allowing the function to match strings regardless of their case. For example, it would match “python”, “Python”, “PYTHON”, or any other variation of the string. re.MULTILINE (re.M): This flag treats^and$as the ...
普通字符 ret = re.match(r'[a-zA-Z0-9]{6,12}@(163|126|qq)\.com$', email) if ret: print("%s 符合要求" % email else: print("%s 不符合要求" % email) if __name__ == '__main__': checkemail_address() 请输入邮箱地址:12345ABC@126.com 12345ABC@126.com 符合要求 请输入...
'egg' (?<!...)Matches if the current position in the string is not preceded by a match for ... This is called a negative lookbehind assertion. Similar to positive lookbehind assertions, the contained pattern must only match strings of some fixed length. Patterns which start with negative ...
You can use quotes inside a string, as long as they don't match the quotes surrounding the string: Example print("It's alright") print("He is called 'Johnny'") print('He is called "Johnny"') Try it Yourself » Assign String to a Variable ...
_StoreAction(option_strings=[], dest='foo', nargs=None, const=None, default=None, type=None, choices=None, help=None, metavar=None) >>> foo_parser.parse_args(["--parent", "2", "XXX"]) Namespace(foo='XXX', parent=2) formatter_class: 重置 help 信息输出的格式 ...
search(pattern, html_snippet) if match: phone_number = match.group(1) print(phone_number) 1.2 常见文本处理任务举例 1.2.1 数据清洗与预处理 数据清洗是数据分析的第一道工序,包括去除噪声数据、填补缺失值、转换格式等。例如,清理包含空格、特殊字符的字符串数据: text = " Hello, World ! @#$%^&*...
(?<=abc)def will find a match in abcdef, since the lookbehind will back up 3 characters and check if the contained pattern matches. The contained pattern must only match strings of some fixed length, meaning that abc or a|b are allowed, but a* and a{3,4} are not. Note that ...
i=2ifi==3:print('true!')else:print('False')# 错误示例ifi==3:print('i:')print(i)else:print('wrong answer!')# 没有严格缩进,执行时会报错print('please check again') 这里将会报错IndentationError: unindent does not match any outer indentation level,这个错误表示采用的缩进方式不一致,有的是...
Many chapters in this tutorial end with an exercise where you can check your level of knowledge. See all Python Exercises Python Examples Learn by examples! This tutorial supplements all explanations with clarifying examples. Python Quiz Test your Python skills with a quiz. ...