字符串

用单引号'' 或者 "" 括起来的任意字符表示字符串

如果字符串中既包含' 也包含 ", 可以用转义字符来表示。

例如： str="I'm \"tux\""

字符串截取操作

str='abcdefg'

syntax	result	description
`str[0]`	a	character in position 0
`str[5]`	f	character in position 5
`str[-1]`	g	the last character
`str[-2]`	f	the second last character
`str[0:2]`	ab	characters from position 0(include) to position 2(exclude)
`str[2:5]`	cde	characters from position 2(include) to position 5(exclude)
`str[:2]`	ab	characters from the beginning to position 2(exclude)
`str[:-1]`	abcdef	characters from the beginning the the last character(exclude)
`str[4:]`	efg	characters from position 4 to the end
`str[-2:]`	fg	characters from the second last to the end
`str[-1:]`	f	the last character
`str[:]`	abcdefg	all the characters
`str[::-1]`	gfedcba	`[::-1]` 字符串最后一个字符到第一个字符，也就是对字符串逆序
`str[::-2]`	geca	`[::-2]` 字符串逆序，间隔一个字符

ord将字符转换为对应的ASCII码

chr 将0-255的任一整数转换为对应的字符

string.join(iterable)

将多个字符串连接, join的参数必须是可迭代的对象，例如 list

例：

str1 = 'Hello'
str2 = 'Tux'
'.'.join([str1, str2])

结果为: Hello.Tux

'-'.join(str1, str2)

结果为: Hello-Tux

字符串的链接符号即调用join的字符串