字符串
单引号和双引号都合法，并满足互相插入
>>> 'let me' 'let me' >>> "let me" 'let me' >>> 'let"s me' 'let"s me' >>> "let's me" "let's me"转义字符
\' 单引号 >>> 'let\' me' "let' me" >>> "let\" me" 'let" me' \n 换行 >>> ''' hello world hello world hello world ''' '\nhello world\nhello world\nhello world\n' >>> """ hello world hello world hello world """ '\nhello world\nhello world\nhello world\n' >>> print('\nhello world\nhello world\nhello world\n') hello world hello world hello world r'' 原始字符串 >>> print('C:\newFile\nowFile') C: ewFile owFile >>> print('C:\\newFile\\nowFile') C:\newFile\nowFile >>> print(r'C:\newFile\nowFile') C:\newFile\nowFile \r 回车 \t 横向制表符字符串运算
C:\newFile\nowFile >>> 'hello'+'world' 'helloworld' >>> 'me'*3 'mememe'字符串操作 >>> 'abcdefg'[0] 'a' >>> 'abcdefg'[1] 'b' >>> 'abcdefg'[-0] 'a' >>> 'abcdefg'[-1] 'g' >>> 'abcdefg'[1:4] 'bcd' >>> 'abcdefg'[2:4] 'cd' >>> 'abcdefg'[0:-1] 'abcdef' >>> 'abcdefg'[0:0] '' >>> 'abcdefg'[0:-0] '' >>> 'abcdefg'[0:15] 'abcdefg' >>> 'abcdefg'[] SyntaxError: invalid syntax >>> 'abcdefg'[1:] 'bcdefg' >>> 'abcdefg'[:-2] 'abcde'