原文地址:http://blog.csdn.net/zanfeng/article/details/52164124
使用print输出各型的
-
字符串
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整数
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浮点数
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出度及精度控制
strHello = ‘Hello Python‘ print strHello #输出结果:Hello Python #直接出字符串
1.格式化输出整数
python print也支持参数格式化,与C言的printf似,
strHello = "the length of (%s) is %d" %(‘Hello World‘,len(‘Hello World‘)) print strHello #输出果:the length of (Hello World) is 11
2.格式化输出16制整数
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
如果需要输出二进制的话,可以使用python函数 bin()
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‘ >>>
3.格式化输出浮点数(float)
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
4.格式化输出字符串(string)
#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。
5.输出列表(list)
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
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。
for i in range(0,5): print i,
或直接使用下面的函数进行输出:
sys.stdout.write("输出的字串")
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
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." )
输出结果:
$ python ex8.py 1 2 3 4 ‘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.‘ $