org/python-get-last-n-characters-of-a-string/给定一个字符串和一个整数 N,任务是编写一个 python 程序来打印字符串的最后 N 个字符。示例:输入:极客为极客!;N = 4 输出:例! 说明:给定的字符串是极客为极客!最后 4 个字符是 eks!。 输入:PYTHON;N=1 输出: N 说明:给定的字符串是
Just like getting individual items out of a list, you can get individual characters out of a string using index notation. 与取得列表中的元素一样,也可以通过下标记号取得字符串中的某个字符。 类似列表,可以使用+操作符来连接(concatenate)字符串。 格式化字符串 字符串可以使用单引号或者双引号来定义。 ...
word[4:]# Characters from position 4 (included) to the end. 输出为: Output 'on' 此示例显示在开始位置使用负索引: Python word[-2:]# Characters from the second-to-last (included) to the end. 输出为: Output 'on' 该特征表示s[:i] + s[i:]始终等于s,如下所示: ...
Astringis a Python data type that’s used to represent a piece of text. It’s written between quotes, either double quotes or single quotes and can be as short as zero characters, or empty string, or as long as you wish. Strings can beconcatenatedto build longer strings using the plus...
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...
string="Hello, world!"last_few_characters=string[-3:]# 获取后3位字符print(last_few_characters)# 输出:ld! 1. 2. 3. 上述代码中,我们使用[-3:]来进行切片操作,其中负数索引表示从字符串末尾开始计数。由于切片操作返回的是一个新的字符串,因此我们可以直接将结果保存在变量中或者进行其他操作。
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...
-c, --code TEXT Format the code passedinasa string. -l, --line-length INTEGER How many characters per line to allow. [default:88] -t, --target-version [py33|py34|py35|py36|py37|py38|py39|py310] Python versions that should be supported by ...
A Python String object is immutable, so you can’t change its value. Any method that manipulates a string value returns a new String object. The examples in this tutorial use thePython interactive consolein the command line to demonstrate different methods that remove characters. ...
bytes("风回雪舞","utf-16") b'\xff\xfe\xce\x98\xdeV\xea\x96\x1e\x82' >>> bytes("风回雪舞","ascii") Traceback (most recent call last): File "<stdin>", line 1, in <module> UnicodeEncodeError: 'ascii' codec can't encode characters in position 0-3: ordinal not in range(...