python3-列表与字符串

del如下。pop弹出元素并返回。

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print(x)
[1, 2, 5, 6, 8, 4, 3, 5]

del x[3]
print(x)
[1, 2, 5, 8, 4, 3, 5]

y=x.pop()
print(y)
5

x
print(x)
[1, 2, 5, 8, 4, 3]

print(x)
[1, 2, 5, 8, 4, 3]

x
z=x.pop(3)
print(x)
[1, 2, 5, 4, 3]

z
print(z)
8

x1=(1,2,"aaaa")
x2=(3,4,"bbbb")

x1,x2
print(x1,x2)
(1, 2, 'aaaa') (3, 4, 'bbbb')
x1
(1, 2, 'aaaa')

x2
x2
(3, 4, 'bbbb')

print(x1[0],x1[1])
1 2

print(x2[2],x1[1])
bbbb 2

```python
str='1234\n5aaaaa'
print(str)
str="123\n45'aaaa'a"
print(str)

1234
5aaaaa
123
45'aaaa'a

str="""
adfdf
{asdf}
//2qerffasda
"""
print(str)
str='''adfdf
{asdf}
//2qerffasda'''
print(str)

adfdf
{asdf}
//2qerffasda

adfdf
{asdf}
//2qerffasda

str="""123\n45'aaaa'a"""
print(str)
str='''123\n45'aaaa'a'''
print(str)
str='''
123\n45'aaaa'a
'''
print(str)

123
45'aaaa'a
123
45'aaaa'a

123
45'aaaa'a

str='''
123\n
45'aaaa'a
'''
print(str)

123

45'aaaa'a

可见三引号中转义字符还是有作用，但使用r则可以消除转义字符的作用

str='''
123\n
45'aaaa'a
aa\\
bb
'''
print(str)
str=r'''
123\n
45'aaaa'a
aa\\
bb
'''
print(str)

123

45'aaaa'a
aa\
bb

123\n
45'aaaa'a
aa\\
bb

s="ssadf"
print(s)
del s
print(s)

ssadf
---------------------------------------------------------------------------
NameError                                 Traceback (most recent call last)
 in 
      2 print(s)
      3 del s
----> 4 print(s)

NameError: name 's' is not defined

print(x)
x3=tuple(x)
print(x3)
[1, 2, 5, 4, 3, 10, 20, [1, 2]]
(1, 2, 5, 4, 3, 10, 20, [1, 2])

print(x3[5],x3[6])
10 20

1
print(x[7][0])
print(x[7][1])
1
2