string="Hello, World!"last_char=string[-1]second_last_char=string[-2]third_last_char=string[-3]print("最后一个字符:",last_char)print("倒数第二个字符:",second_last_char)print("倒数第三个字符:",third_last_char) 1. 2. 3. 4. 5. 6. 7. 8. 以上代码输出结果如下: 最后一个字符: ...
defget_last_three_characters(string):returnstring[-3:]# 测试示例string1="Hello"string2="Mermaid"string3="Python"last_three1=get_last_three_characters(string1)last_three2=get_last_three_characters(string2)last_three3=get_last_three_characters(string3)print(f"The last three characters of '{s...
In addition, we canaccess just a specific characteror aslice of charactersof a string. We might want to do this, for example, if we have a text that’s too long to display and we want to show just a portion of it. Or if we want to make an acronym by taking the first letter of...
or to sys.stdout bydefault.Optional keyword arguments:file:a file-likeobject(stream);defaults to the current sys.stdout.sep:string inserted between values,defaulta space.end:string appended after the last value,defaulta newline.flush:whether to forcibly flush the stream.Type...
--- IndexError Traceback (most recent call last) <ipython-input-70-e894f93573ea> in <module> ---> 1 word[42] # The word only has 6 characters. IndexError: string index out of range 但在范围内,太大的索引值会默认为字符串的大小,不会导致错误。 如果你总是希望在特定索引处开始切片...
Some Unicode characters may not display if your browser doesn’t have those fonts or if you’re trying to printunprintable characterslike binary data to terminal This tool uses slightly older versions of languages (e.g., Python 3.6) for greater stability and because instructional materials often ...
-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 ...
有这次的①包含有从0-3周课程的代码实例,也包括Python123里的作业部分实例代码,以及运行结果。总体描述方式就是类似下图 主体 1.基本语法元素 ①实例:温度转换 要求 实现华摄氏度(F)与摄氏度(C)的转换 自动根据最后的符号判断输入的是什么类型的温度计量并转换 ...
string.lower(): 这将把字符串转换为小写 string.upper(): 这将把字符串转换为大写 string.replace('a', 'b'): 这将用b替换字符串中的所有a 此外,我们可以使用len()方法获取字符串中字符的数量,包括空格: #!/usr/bin/pythona ="Python"b ="Python\n"c ="Python "printlen(a)printlen(b)printlen...
string_3 = "This is a string." first_letter = string_3[0] To access a range of letters from a larger string, use slicing: string_3[0:4] This will return all characters starting from the number before the colon (0, or the first character) up to but not including the index aft...