2. Modifying strings: Apart from trying to access certain characters inside a string, we might want to change them in case they’re incorrect and we want to fix it, or in case we want to communicate a different
s=' canada 'print(s.rstrip())# For whitespace on the right side use rstrip.print(s.lstrip())# For whitespace on the left side lstrip.print(s.strip())# For whitespace from both side.s=' \t canada 'print(s.strip('\t'))# This will strip any space,\t,\n,or \r characters from...
Then we used the bracket operators to get the first four characters. We used [:4] to indicate that we want four characters from the beginning of the string. This is the same as using [0:4]. Next, we used the replace function to change the “o” character to the “0” character. ...
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Return a copy of S with uppercase characters converted to lowercase and vice versa. 字母大小写转换 1>>> a='ABCDefgh'2>>>a.swapcase()3'abcdEFGH' 5、 S.zfill(width) -> str Pad a numeric string S with zeros on the left, to fill a field ...
Return True if all characters in S are whitespace and there is at least one character in S, False otherwise. 字符串至少一个字符,且所有字符都是空格。 1>>> a='abc'2>>>a.isspace()3False4>>> a[3:].isspace()5True 8、 S.istitle() -> bool ...
this operation raises LookupError, the character is left untouched. Characters mapped to None are deleted. 案例: 用字符的maketrans() 和 translate() 实现凯撒加密算法 string.ascii_letters 1. 'abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ' ...
3.1 使用PIL（pillow）处理图像 (1) 首先介绍PIL的使用 PIL是一个Python图像处理库，是本案例使用的...
Strings can be treated as lists of characters x = "Hello" #查 print(x[0]) # H print(x[-1]) # o print(x[1:]) # ello "world" in x # 查找 x.find("ss") # returns index of first match x.index("lo") x.count("l") # 改(创建新字符串) x.replace("world", "python") ...
Write a Python function to get a string made of the first three characters of a specified string. If the length of the string is less than 3, return the original string. Sample function and result : first_three('ipy') -> ipy