Python print函数用法，print 格式化输出

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使用print输出各型的

字符串 整数 浮点数 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

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 = .3f" % math.pi #width = 10,precise = 3,align = rigth print "PI = %-10.3f" % math.pi #前面填充字符 print "PI = d" % 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 ".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 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.’

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