获取用户输入

>>> x = input("x: ")

x: 34

>>> y = input("y: ")

y: 42

>>> print(int(x) * int(y))

1428

 

导入模块

>>> import math

>>> math.floor(32.9)

32

下面这样导入就不用指定模块名了

>>> from math import sqrt

>>> sqrt(9)

3.0

 

#井号注释

 

字符串转义

>>> "Let's go!"

"Let's go!"

>>> 'Let\'s go!'

"Let's go!"

 

字符串与值的转换

>>> print(repr("Hello,\nworld!"))

'Hello,\nworld!'

>>> print(str("Hello,\nworld!"))

Hello,

world!

 

多行长字符串用三引号

print('''This is a very long string. It continues here.

And it's not over yet. "Hello, world!"

Still here.''')

 

原始字符串

>>> path = 'C:\nowhere'

>>> path

'C:\nowhere'

>>> print(path)

C:

owhere

可以转义

>>> print('C:\\nowhere')

C:\nowhere

也可以用原始字符串让每个字符保持原样

>>> print(r'C:\nowhere')

C:\nowhere

>>> print(r'Let\'s go!')

Let\'s go

原始字符串不能以单个反斜杠结尾

>>> print(r'C:\Program Files\foo\bar' '\\')

C:\Program Files\foo\bar\