【python3】字串格式化
阿新 • • 發佈:2021-06-26
字串的格式化方法分為兩種,分別為佔位符(%)和format方式。佔位符方式在Python2.x中用的比較廣泛,隨著Python3.x的使用越來越廣,format方式使用的更加廣泛。
一 佔位符(%)
%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
位置對映
1 2 |
print ( "{}:{}" . format ( '192.168.0.100' , 8888 ))
#192.168.0.100:8888
|
關鍵字對映
1 2 |
print ( "{server}{1}:{0}" . format ( 8888 , '192.168.1.100' ,server = 'Web Server Info :' ))
#Web Server Info :192.168.1.100:8888
|
元素訪問
1 2 |
print ( "{0[0]}.{0[1]}" . format (( 'baidu' , 'com' )))
#baidu.com
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填充對齊
- ^、<、>分別是居中、左對齊、右對齊
1 2 3 4 5 |
print ( "{0}*{1}={2:0>2}" . format ( 3 , 2 , 2 * 3 ))
#3*2=06
print ( "{:*^30}" . format ( 'centered' ))
#***********centered***********
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例項: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
"""
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精度設定
1 2 3 4 |
print ( "{:.3f}" . format ( 2.1415 ))
#2.142
print ( "{:.10f}" . format ( 3.1415 ))
#3.1415000000
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轉載於:https://www.cnblogs.com/lvcm/p/8859225.html