上述代码中,我们首先导入re模块,然后使用re.compile()函数将要判断的字符串str2编译成正则表达式,设置re.IGNORECASE标志实现大小写不敏感的匹配。然后使用re.search()函数在str1中搜索匹配正则表达式的部分。如果找到匹配的部分,则打印"str1 contains str2 (case insensitive)“;如果没有找到匹配的
例如,我们可以通过str.contains检查各个电⼦邮件地址是否含有"gmail": In [171]: data.str.contains('gmail') Out[171]: Dave False Rob True Steve True Wes NaN dtype: object 1. 2. 3. 4. 5. 6. 7. 也可以使⽤正则表达式,还可以加上任意re选项(如IGNORECASE): In [172]: pattern Out[172]:...
a = float('inf') b = float('nan') c = float('-iNf') # These strings are case-insensitive d = float('nan')Output:>>> a inf >>> b nan >>> c -inf >>> float('some_other_string') ValueError: could not convert string to float: some_other_string >>> a == -c # inf==...
通过data.map,所有字符串和正则表达式方法都能被应用于(传入lambda表达式或其他函数)各个值,但是如果存在NA(null)就会报错。为了解决这个问题,Series有一些能够跳过NA值的面向数组方法,进行字符串操作。通过Series的str属性即可访问这些方法。例如,我们可以通过str.contains检查各个电子邮件地址是否含有"gmail": ...
chars,but did not.Expected<foo>to contain only uppercase chars,but did not.Expected<FOO>to contain only lowercase chars,but did not.Expected<foo>to be equal to<bar>,but was not.Expected<foo>to be not equal to<foo>,but was.Expected<foo>to becase-insensitive equal to<BAR>,but was ...
re.search()Match object or NoneCan be case-insensitive (re.IGNORECASE)No errorsAdvanced pattern matching You can use theinoperator, thefind()method, or regular expressions to check if a string contains a substring in Python. Theinoperator returnsTrueif the substring is found, while thefind()met...
Note that while lookup() and \N{} are case-insensitive, name() always returns the character’s name in uppercase. Lastly, a pretty common use case for escape sequences that you might encounter in Python is ANSI escape codes, which control the formatting and display of text in your ...
The message field matches the start of the warning message printed; this match is case-insensitive. The category field matches the warning category. This must be a class name; the match test whether the actual warning category of the message is a subclass of the specified warning category. The...
AssertionError: Unexpectedly that the str <bar> is not equal to str <foo>.""" 改进方案 #3 不仅仅是你和我对Python中的断言表示不满足,所以大家都争相发明自己的assert包。在这里我强烈推荐assertpy这个包,它异常强大而且好评如潮。 pipinstallassertpy ...
Write a Python program to check that a string contains only a certain set of characters (in this case a-z, A-Z and 0-9). Click me to see the solution 2. a Followed by 0+ b's Write a Python program that matches a string that has anafollowed by zero or more b's. ...