icontains - contains string value, case insensitive startswith - starts with string value istartswith - starts with string value, case insensitive endswith - ends with string value iendswith - ends with string value, case insensitive regex - matches a regex expression iregex - matches a regex...
来看⼀个⼩例⼦,假设我们有⼀段⽂本以及⼀条能够识别⼤部分电⼦邮件地址的正则表达式: text = """Dave dave@ Steve steve@ Rob rob@ Ryan ryan@yahoo.com """ pattern = r'[A-Z0-9._%+-]+@[A-Z0-9.-]+\.[A-Z]{2,4}' # re.IGNORECASE makes the regex case-insensitive regex...
Remember that these methods to check if a string contains a substring are case sensitive. You will need to use either the string lower() or upper() methods on both the string and substring if you want to do a case insensitive search. To learn even more you can do with Python, make su...
To check if a string contains only digits, alphabetic characters, or alphanumeric characters: print("123".isdigit()) # True print("abc".isalpha()) # True print("abc123".isalnum())# True 12. String Slicing To extract a substring using slicing: s = "slice me" sub = s[2:7] # From...
string_data string_data.isnull() # Python内置的None值在对象数组中也可以作为NA: string_data[0] = None string_data.isnull() 1. 2. 3. 4. 5. 6. 7. 8. 9. 10. 11. 12. 13. 14. 下表列出了一些关于缺失数据处理的函数: 2、滤除缺失数据 ...
importunittestclassTestStringMethods(unittest.TestCase):deftest_upper(self): self.assertEqual('foo'.upper(),'FoO')if__name__ =='__main__': unittest.main()""" Failure Expected :'FOO' Actual :'FoO' Traceback (most recent call last): ...
self.headers = CaseInsensitiveDict() if headers: for header in headers.items(): # Raise exception on invalid header value. check_header_validity(header) name, value = header self.headers[to_native_string(name)] = value prepare_cookies() ...
value >>> some_string ["wtf"]▶ Nan-reflexivity *1.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...
(the "r" in the beginning is making sure that the string is being treated as a "raw string")r"\Bain" r"ain\B"Try it » Try it » \dReturns a match where the string contains digits (numbers from 0-9)"\d"Try it » ...
argv[0] is an empty string; if -c is used, sys.argv[0] contains the string '-c'. Note that options interpreted by the Python interpreter itself are not placed in sys.argv. In interactive mode, the primary prompt is `>>>'; the second prompt (which appears when a command is not ...