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‘> >>>