defget_last_n_characters(string,n):returnstring[-n:]string="Hello, World!"last_three_characters=get_last_n_characters(string,3)print(last_three_characters)# 输出:ld! 1. 2. 3. 4. 5. 6. 在上面的示例中,我们定义了一个函数get_last_n_characters,接受一个字符串和一个整数n作为参数,返回字...
7 8 Public module variables: 9 10 whitespace -- a string containing all characters considered whitespace 11 lowercase -- a string containing all characters considered lowercase letters 12 uppercase -- a string containing all characters considered uppercase letters 13 letters -- a string containing a...
characters considered punctuation 18 printable -- a string containing all characters considered printable 19 20 """ 21 22 # Some strings for ctype-style character classification 23 whitespace = ' \t\n\r\v\f' 24 lowercase = 'abcdefghijklmnopqrstuvwxyz' 25 uppercase = 'ABCDEFGHIJKLMNOPQRST...
So Python returns a new string to me. 我也可以使用负索引进行切片。 I can also do slicing using negative indices. 例如,如果我键入S,减去3,Python将给出该序列中的最后三个字符,即h、o和n。 So for example, if I type S, minus 3, Python will give me the last three characters in that sequ...
Unicode 把字符(characters)定义为有语义的、可独立存在的最小书写单位。多个 Unicode 字符可以组合成视觉上的另一个字符,这种组合称为字素群(grapheme clusters)。例如,字素群 á 由两个字符组成:拉丁字母 a 和重音符´。出于兼容考虑,有些字素群也会被编码成单独的字符。这种组合设计使 Unicode 能表示各种各...
Declare the string variable: s='ab\ncd\nef' Copy Replace all the\ncharacters withNone: print(s.translate({ord('\n'): None})) Copy The output is: Output abcdef Copy The output shows that all occurrences of the newline character\nwere removed from the string as defined in the custom ...
12) string.whitespace 所有的空白符包含 \t 制表符 \n 换行符 (linefeed) \x0b \x0C \r 不要改变这个定义──因为所影响它的方法strip()和split()为被定义 A string containing all characters that are considered whitespace. On most systems this includes the characters space, tab, linefeed, retur...
The left edge of the first character in the string is numbered 0. We can slice from this location with the index i. The right edge of the last character of a string of n characters has the index n. We can slice from this location with the index j. For example:Python Copy ...
[,deletechars]) -> string|| Return a copy of the string S, where all characters occurring...
除了切片操作,Python还为字符串提供了一个便捷的方式来获取后几位字符。即使用[-n:]的形式,其中n表示要获取的字符个数。 string="Hello, world!"last_few_characters=string[-3:]# 获取后3位字符print(last_few_characters)# 输出:ld! 1. 2.