Pythonprint函数⽤法，print格式化输出原⽂地址：blog.csdn/zanfeng/article/details/52164124
使⽤print输出各型的
1. 字符串
2. 整数
3. 浮点数
4. 出度及精度控制
strHello = 'Hello Python'
print strHello
#输出结果：Hello Python
#直接出字符串
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
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'
>>>
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
#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。
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'}
函数printf#同python也是⽀持dictionary出的
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")
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。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.'
$

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