print()中格式符号用法

1.格式化输出16制整数

nHex = 0x20
%x --- hex 十六进制
%d --- dec 十进制
%o --- 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()

bin(num)

2.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

3.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。

4.%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：

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.'

最后

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