原文地址:http://blog.csdn.net/zanfeng/article/details/52164124 / https://www.cnblogs.com/hokky/p/8434236.html
使用print输出各型的
-
字符串
-
整数
-
浮点数
-
出度及精度控制
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strHello
=
'Hello Python'
print
strHello
#输出结果:Hello Python
#直接出字符串
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1.格式化输出整数
python print也支持参数格式化,与C言的printf似,
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strHello
=
"the length of (%s) is %d"
%
(
'Hello World'
,
len
(
'Hello World'
))
print
strHello
#输出果:the length of (Hello World) is 11
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2.格式化输出16制整数
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nHex
=
0x20
#%x --- hex 十六进制
#%d --- dec 十进制
#%d --- oct 八进制
print
"nHex = %x,nDec = %d,nOct = %o"
%
(nHex,nHex,nHex)
#输出结果:nHex = 20,nDec = 32,nOct = 40
#使用整数的各个制打印同一个数
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如果需要输出二进制的话,可以使用python函数 bin()
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Python
2.7
.
6
(default, Nov
10
2013
,
19
:
24
:
18
) [MSC v.
1500
32
bit (Intel)] on win
32
Type
"help"
,
"copyright"
,
"credits"
or
"license"
for
more information.
>>>
bin
(
789
)
'0b1100010101'
>>>
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3.格式化输出浮点数(float)
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import
math
#default
print
"PI = %f"
%
math.pi
#width = 10,precise = 3,align = left
print
"PI = %10.3f"
%
math.pi
#width = 10,precise = 3,align = rigth
print
"PI = %-10.3f"
%
math.pi
#前面填充字符
print
"PI = %06d"
%
int
(math.pi)
#输出结果
#PI = 3.141593
#PI = 3.142
#PI = 3.142
#PI = 000003
#浮点数的格式化,精度、度和
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4.格式化输出字符串(string)
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#precise = 3
print
"%.3s "
%
(
"jcodeer"
)
#precise = 4
print
"%.*s"
%
(
4
,
"jcodeer"
)
#width = 10,precise = 3
print
"%10.3s"
%
(
"jcodeer"
)
#输出结果:
#jco
#jcod
# jco
#同于字符串也存在精度、度和。
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5.输出列表(list)
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l
=
[
1
,
2
,
3
,
4
,
'jcodeer'
]
print
l
#输出结果:[1, 2, 3, 4, 'jcodeer']
#于list直接打印即可
'''6.出字典(dictionary)'''
d
=
{
1
:
'A'
,
2
:
'B'
,
3
:
'C'
,
4
:
'D'
}
print
d
#输出结果:{1: 'A', 2: 'B', 3: 'C', 4: 'D'}
#同python也是支持dictionary出的
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6.python print自动换行
print 会自动在行末加上回车,如果不需回车,只需在print语句的结尾添加一个逗号”,“,就可以改变它的行为。
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for
i
in
range
(
0
,
5
):
print
i,
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或直接使用下面的函数进行输出:
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sys.stdout.write(
"输出的字串"
)
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7. 万能的 %r
有个同事问我python里面print ”%r” 是什么用途,被问倒了。
用了这么些年的python,还没用过print %r。
网上查了一下,发现%r是一个万能的格式付,它会将后面给的参数原样打印出来,带有类型信息。
python print %r 案例
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formatter
=
"%r %r %r %r"
print
formatter
%
(
1
,
2
,
3
,
4
)
print
formatter
%
(
"one"
,
"two"
,
"three"
,
"four"
)
print
formatter
%
(
True
,
False
,
False
,
True
)
print
formatter
%
(formatter, formatter, formatter, formatter)
print
formatter
%
(
"I had this thing."
,
"That you could type up right."
,
"But it didn't sing."
,
"So I said goodnight."
)
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输出结果:
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$ python ex8.py
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'one'
'two'
'three'
'four'
True
False
False
True
'%r %r %r %r'
'%r %r %r %r'
'%r %r %r %r'
'%r %r %r %r'
'I had this thing.'
'That you could type up right.'
"But it didn't sing."
'So I said goodnight.'
$
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