isdigit:判断字符串中是否只包含数字,可识别特殊数字 ``` def isdigit(self): # real signature unknown; restored from __doc__ """ S.isdigit() -> bool Return True if all characters in S are digits and there is at least one character in S, False otherwise. """ return False ``` 用法实...
') # Use the correct key: if request == 'p': key = 'phone' if request == 'a': key = 'addr' # Only try to print information if the name is a valid key in # our dictionary: if name in people: print("{}'s {} is {}.".format(name, labels[key], people[name][key])) ...
done using the specified fill character (default is a space) 示例: >>> s = 'hello world' >>> s.center(30,'*') '***hello world***' ljust 返回长度为 width 的字符串,原字符串左对齐,后面填充fillchar 返回一个原字符串左对齐,并使用 fillchar 填充至长度 width 的新字符串,fillchar 默认为...
fillchar]) -> str Return S left-justified in a Unicode string of length width. Padding is done using the specified fill character (default is a space). """ return "" 1. 2. 3. 4. 5.6
""" return False def isalpha(self): # real signature unknown; restored from __doc__ """ 至少一个字符,且都是字母才返回True S.isalpha() -> bool Return True if all characters in S are alphabetic and there is at least one character in S, False otherwise. """ return False def is...
>>> a is b True >>> a = 257 >>> b = 257 >>> a is b False >>> a == b True >>> 4.强制2个字符串指向同一个对象 sys中的intern方法强制两个字符串指向同一个对象 '''sys中的intern方法强制两个字符串指向同一个对象'''
You get False if the target string contains at least one non-printable character. Again, non-alphabetic characters are ignored. Note that .isprintable() is one of two .is*() methods that return True if the target string is empty. The second one is .isascii().....
Return a copy of the string with only its first character capitalized. For 8-bit strings, this method is locale-dependent. str.center(width[, fillchar]) Return centered in a string of length width. Padding is done using the specified fillchar (default is a space). ...
) | S.isprintable() -> bool | | Return True if all characters in S are considered | printable in repr() or S is empty, False otherwise. | | isspace(...) | S.isspace() -> bool | | Return True if all characters in S are whitespace | and there is at least one character in ...
If x is not a number or if base is given, then x must be a string, bytes, or bytearray instance representing an integer literal in the given base. The literal can be preceded by '+' or '-' and be surrounded by whitespace. The base defaults to 10. Valid bases are 0 and 2-36....