字符串的格式化方法分为两种,分别为占位符(%)和format方式。占位符方式在Python2.x中用的比较广泛,随着Python3.x的使用越来越广,format方式使用的更加广泛。

%d
实例(Python3.0+):
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age = 29
print ( "my age is %d" % age)
#my age is 29
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%s
实例(Python3.0+):
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name = "makes"
print ( "my name is %s" % name)
#my name is makes
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%f
实例(Python3.0+):
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print ( "%6.3f" % 2.3 )
#2.300
print ( "%f" % 2.3 )
#2.300000
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format方法
位置映射

实例(Python3.0+):
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print ( "{}:{}" . format ( '192.168.0.100' , 8888 ))
#192.168.0.100:8888
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关键字映射

实例(Python3.0+):
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print ( "{server}{1}:{0}" . format ( 8888 , '192.168.1.100' ,server = 'Web Server Info :' ))
#Web Server Info :192.168.1.100:8888
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元素访问


实例(Python3.0+):
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print ( "{0[0]}.{0[1]}" . format (( 'baidu' , 'com' )))
#baidu.com
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填充对齐
- ^、<、>分别是居中、左对齐、右对齐

实例1(Python3.0+):
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print ( "{0}*{1}={2:0>2}" . format ( 3 , 2 , 2 * 3 ))
#3*2=06
print ( "{:*^30}" . format ( 'centered' ))
#***********centered***********
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实例2(Python3.0+):九九乘法表
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for i in range ( 1 , 10 ):
a = 1
while a < = i:
print ( "{0}*{1}={2:0>2}" . format (a,i,a * i),end = "\t" )
a + = 1
print ()
"""
1*1=01
1*2=02 2*2=04
1*3=03 2*3=06 3*3=09
1*4=04 2*4=08 3*4=12 4*4=16
1*5=05 2*5=10 3*5=15 4*5=20 5*5=25
1*6=06 2*6=12 3*6=18 4*6=24 5*6=30 6*6=36
1*7=07 2*7=14 3*7=21 4*7=28 5*7=35 6*7=42 7*7=49
1*8=08 2*8=16 3*8=24 4*8=32 5*8=40 6*8=48 7*8=56 8*8=64
1*9=09 2*9=18 3*9=27 4*9=36 5*9=45 6*9=54 7*9=63 8*9=72 9*9=81
"""
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精度设置

实例(Python3.0+):
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print ( "{:.3f}" . format ( 2.1415 ))
#2.142
print ( "{:.10f}" . format ( 3.1415 ))
#3.1415000000
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