Python输入/输出语句

Python输出语句print函数

print()函数基本使用

　　　　打印整形数据

　　　　打印浮点型数据

　　　　打印字符型数据

>>> print(12)
12
>>> print(12.5)
12.5
>>> print(\'B\')
B
>>> print(\'WWW.baidu.com\')
WWW.baidu.com
>>> x=12
>>> print(12)
12
>>> y=12.88
>>> print(y)
12.88
>>> z=\'www.bling.com\'
>>> print(z)
www.bling.com
>>> print z
www.bling.com
>>> print x,y,z
12 12.88 www.bling.com
>>> print(z,y,z)
(\'www.bling.com\', 12.88, \'www.bling.com\')

print格式化输出

　　print(format(val,fomat_modifier))

　　　　var:值

　　　　fomat_modifier:格式字

　　print(12.34567,\'m.nf\')

　　　　m:表示占位数量（m）,m<有效位时，左对齐；m>有效位时，右对齐

　　　　n:表示精度(n)

　　print x,y \'逗号\'连接输出

>>> print(format(12.345678,\'6.2f\'))
 12.35
>>> print(format(12.345678,\'6.3f\'))
12.346
>>> print(format(12.345678,\'6.9f\'))
12.345678000
>>> print(format(12.345678,\'6.0f\'))
    12
>>> print(format(12.345678,\'6.3f\'))
12.346
>>> print(format(12.345678,\'6.2f\'))
 12.35
>>> print(format(12.345678,\'9.2f\'))
    12.35
>>> print(format(12.345678,\'3.2f\'))
12.35
>>> print(format(12.345678,\'5.2f\'))
12.35

　　print()格式化输出format

　　　　print(format(val,fomat_modifier))

　　　　print(format(0.3456,\'.2%\'))

>>> print(format(0.3456,\'.2%\'))
34.56%
>>> print(format(0.3456,\'.3%\'))
34.560%
>>> print(format(0.3456,\'.6%\'))
34.560000%
>>> print(format(0.3456,\'6.3%\'))
34.560%
>>> print(format(0.3456,\'6.1%\'))
 34.6%

Python输入函数

　　re = raw_input(prompt)

　　prompt:提示字符，从键盘读取数据

　　re:返回值，返回字符串

　　类型转换：int()(转为整形)、float()（浮点型）

>>> re = raw_input()
www.bling.com
>>> print(re)
www.bling.com
>>> type(re)
<type \'str\'>
>>> age = raw_input(\'your age :\')
your age :22
>>> age = age +1

Traceback (most recent call last):
  File "<pyshell#11>", line 1, in <module>
    age = age +1
TypeError: cannot concatenate \'str\' and \'int\' objects
>>> age = int(age)
>>> age
22
>>> age = age +1
>>> age
23
>>> type(age)
<type \'int\'>
>>> age = int(raw_input(\'PLZ input your age :\'))
PLZ input your age :23
>>> type(age)
<type \'int\'>
>>> f1 = float(\'12.35\')
>>> type(f1)
<type \'float\'>
>>> weight = float(raw_input(\'Plz input your weight :\'))
Plz input your weight :70.01
>>> print(weight)
70.01
>>> type(weight)
<type \'float\'>
>>>