python print 格式化输出
使用print可以输出的类型有:字符串、整数、浮点数及精度控制。
1.格式化输出整数
python print也支持参数格式化,与C言的printf似:
1strHello = "the length of (%s) is %d" %('Hello World',len('Hello World'))
2print strHello
3#输出果:the length of (Hello World) is 11
2.格式化输出16制整数
1nHex = 0x20
2#%x --- hex 十六进制
3#%d --- dec 十进制
4#%d --- oct 八进制
5print "nHex = %x,nDec = %d,nOct = %o" %(nHex,nHex,nHex)
6#输出结果:nHex = 20,nDec = 32,nOct = 40
7#使用整数的各个制打印同一个数
如果需要输出二进制的话,可以使用python函数 bin()
1>>> bin(789)
2'0b1100010101'
3>>>
3.格式化输出浮点数(float)
1import math
2#default
3print "PI = %f" % math.pi
4#width = 10,precise = 3,align = left
5print "PI = %10.3f" % math.pi
6#width = 10,precise = 3,align = rigth
7print "PI = %-10.3f" % math.pi
8#前面填充字符
9print "PI = %06d" % int(math.pi)
10#输出结果
11#PI = 3.141593
12#PI = 3.142
13#PI = 3.142
14#PI = 000003
15#浮点数的格式化,精度、度和
4.格式化输出字符串(string)
1#precise = 3
2print "%.3s " % ("jcodeer")
3#precise = 4
4print "%.*s" % (4,"jcodeer")
5#width = 10,precise = 3
6print "%10.3s" % ("jcodeer")
7#输出结果:
8#jco
9#jcod
10# jco
11#同于字符串也存在精度、度和。
5.输出列表(list)
1l = [1,2,3,4,'jcodeer']
2print l
3#输出结果:[1, 2, 3, 4, 'jcodeer']
4#于list直接打印即可
5'''6.出字典(dictionary)'''
6d = {1:'A',2:'B',3:'C',4:'D'}
7print d
8#输出结果:{1: 'A', 2: 'B', 3: 'C', 4: 'D'}
9#同python也是支持dictionary出的
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 —- 加了逗号后,会由列输出变成行输出。
1for i in range(0,5):
2 print i,
或直接使用下面的函数进行输出:
1sys.stdout.write("输出的字串")
7. 万能的 %r
%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。
1formatter = "%r %r %r %r"
2print formatter % (1, 2, 3, 4)
3print formatter % ("one", "two", "three", "four")
4print formatter % (True, False, False, True)
5print formatter % (formatter, formatter, formatter, formatter)
6print formatter % (
7"I had this thing.",
8"That you could type up right.",
9 "But it didn't sing.",
10 "So I said goodnight."
11 )
输出结果:
11 2 3 4
2'one' 'two' 'three' 'four'
3True False False True
4'%r %r %r %r' '%r %r %r %r' '%r %r %r %r' '%r %r %r %r'
5'I had this thing.' 'That you could type up right.' "But it didn't sing." 'So I said goodnight.'
示例:
1#coding:utf-8
2#字符串格式化示例
3#使用给定的宽度打印格式化后的价格列表
4#-------------------------------------------------------------
5# 1,使用星号(*)作为字符宽度或者精度(或者两者都使用*),此时数值会从元祖参数中读出:
6# 如:
7# >>> '%.*s' % (5,'Guido van Rossum')
8# 'Guido'
9# >>> '%.*s' % (9,'Guido van Rossum')
10# 'Guido van'
11#2,减号(-)用来左对齐数值
12# >>> from math import pi
13# >>> '%-10.2f' % pi
14# '3.14 '
15# >>> '%10.2f' % pi
16# ' 3.14'
17# >>> '%+10.2f' % pi
18# ' +3.14'
19#3,空白('')意味着在正数前加上空格,在需要对齐正负数时会很有用:
20# >>> print ('% 5d' % 10) + '\n' + ('% 5d' % -10)
21# 10
22# -10
23#4,加号(+)表示不管是正数还是负数都标示出符号
24# >>> print ('%+5d' % 10) + '\n' + ('%+5d' % -10)
25# +10
26# -10
27#-----------------------------------------------------------
28width = input('请输入表格的宽度:')
29price_width = 10
30item_width = width - price_width
31header_format = '%-*s%*s'
32format = '%-*s%*.2f'
33print '='*width
34#打印表头
35print header_format %(item_width,'项目',price_width,'价格')
36print '-' * width
37print format % (item_width,'苹果',price_width,6.0)
38print format % (item_width,'桔子',price_width,3.2)
39print format % (item_width,'香蕉',price_width,2.5)
40print format % (item_width,'葡萄',price_width,14.8)
41print format % (item_width,'红提',price_width,15)
42print format % (item_width,'西瓜',price_width,1.5)
43print '='*width
输出结果:
1请输入表格的宽度:30
2==============================
3项目 价格
4------------------------------
5苹果 6.00
6桔子 3.20
7香蕉 2.50
8葡萄 14.80
9红提 15.00
10西瓜 1.50
11==============================
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- Author: shisekong
- Link: https://blog.361way.com/python-print-format/4488.html
- License: This work is under a 知识共享署名-非商业性使用-禁止演绎 4.0 国际许可协议. Kindly fulfill the requirements of the aforementioned License when adapting or creating a derivative of this work.