python python 3.5 linux

python 基础教程之3 格式化数据,布尔值,if,布尔逻辑

linux python基础教程 python 3.5

Posted by ivo on March 20, 2018

0x06 格式化数据

  • 常用的 int() str() float() 
    >>> x = 5
>>> y = x + 3
>>> y = int(str(y) + '2')
>>> print(y)
82
>>> float(y)
82.0

0x07 布尔值

  • python里面的布尔值有两种 True和False 
    >>> my_abc = True
>>> my_abc
True
>>> 2 == 3
False
>>> 1 != 1
False
>>> 'abc' != "cc"
True
>>> 5 > 3
True
>>> 5 > 5
False
>>> 5 >= 5
True
>>> 5 <= 5
True
>>> 5 <= 5.0
True

0x08 if控制流

  • if语句的格式 
    if 判断条件:
[tab]执行的内容

    cat test2.py
#!/usr/bin/env python3
# -*- coding: utf-8 -*-
if 10 > 5:
print('good')
print('end it')

    ./test2.py
good
end it

    >>> num = 12
>>> if num > 5:
...     print("Bigger than 5")
...     if num < 47:
...             print("Between 5 and 47")
...
Bigger than 5
Between 5 and 47

    >>> num = 7
>>> if num == 5:
...   print("Number is 5")
... else:
...   if num == 11:
...     print("Number is 11")
...   else:
...     if num == 7:
...       print("Number is 7")
...     else:
...       print("Number isn't 5, 11 or 7")
...
Number is 7

    >>> num = 7
>>> if num == 5:
...    print("Number is 5")
... elif num == 11:
...    print("Number is 11")
... elif num == 7:
...    print("Number is 7")
... else:
...    print("Number isn't 5, 11 or 7")
...
Number is 7

0x0A 布尔逻辑

  • 与and 或or 非not 
    >>> 1 == 1 and 2 == 2
True
>>> 1 == 1 and 2 == 3
False
>>> 1 != 1 and 2 == 2
False
>>> 2 < 1 and 3 >  6
False

    >>> 1 == 1 or 2 == 2
True
>>> 1 == 1 or 2 == 3
True
>>> 1 != 1 or 2 == 2
True
>>> 2 < 1 or 3 >  6
False

    >>> not 1 == 1
False
>>> not 1 > 7
True
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