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Python输入/输出语句

2024-07-12 15:34:32   222人阅读

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 +1Traceback (most recent call last):  File "<pyshell#11>", line 1, in <module>    age = age +1TypeError: cannot concatenate ‘str‘ and ‘int‘ objects>>> age = int(age)>>> age22>>> age = age +1>>> age23>>> 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‘>>>>


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