Python 字符串 - 爱码网

字符串

定义

>>> a = 'hello'
>>> b = 'what\'s up'
>>> c = "what's up"
>>> print(a)
hello
>>> print(b)
what's up
>>> print(c)
what's up

索引

>>> s = 'hello'
>>> print(s[0])
h
>>> print(s[1])
e

切片

>>> s = 'hello'
>>> print(s[0:3]) # 切片的规则：s[start:end:step] 从start开始到end-1结束，步长:step
hel
>>> print(s[0:4:2])
hl

#显示所有字符
>>> print(s[:])
hello

#显示前3个字符
>>> print(s[:3])
hel

#对字符串倒叙输出
>>> print(s[::-1])
olleh

#除了第一个字符以外，其他全部显示
>>> print(s[1:])
ello

重复

>>> s = 'hello'
>>> print(s * 5)
hellohellohellohellohello

连接

>>> s = 'hello'
>>> print(s + 'world')
helloworld

成员操作符

>>> s = 'hello'
>>> print('h' in s)
True
>>> print('w' in s)
False

for循环（迭代）

>>> s = 'hello'
>>> for i in s:
...     print(i)
... 
h
e
l
l
o

Python 字符串