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。
一 占位符(%)
%d
1
2
3
|
age = 29 print ( "my age is %d" % age) #my age is 29 |
%s
1
2
3
|
name = "makes" print ( "my name is %s" % name) #my name is makes |
%f
1
2
3
4
|
print ( "%6.3f" % 2.3 ) #2.300 print ( "%f" % 2.3 ) #2.300000 |
二 format方法
位置映射
1
2
|
print ( "{}:{}" . format ( ‘192.168.0.100‘ , 8888 )) #192.168.0.100:8888 |
关键字映射
1
2
|
print ( "{server}{1}:{0}" . format ( 8888 , ‘192.168.1.100‘ ,server = ‘Web Server Info :‘ )) #Web Server Info :192.168.1.100:8888 |
元素访问
1
2
|
print ( "{0[0]}.{0[1]}" . format (( ‘baidu‘ , ‘com‘ ))) #baidu.com |
填充对齐
- ^、<、>分别是居中、左对齐、右对齐
1
2
3
4
5
|
print ( "{0}*{1}={2:0>2}" . format ( 3 , 2 , 2 * 3 )) #3*2=06 print ( "{:*^30}" . format ( ‘centered‘ )) #***********centered*********** |
实例:九九乘法表
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
|
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 """ |
精度设置
1
2
3
4
|
print ( "{:.3f}" . format ( 2.1415 )) #2.142 print ( "{:.10f}" . format ( 3.1415 )) #3.1415000000 |
转载于:https://www.cnblogs.com/lvcm/p/8859225.html