标签:contain spl image lap info 2.x gif red value
平台:win10 x64+Python3.7.0
Python3 字符串格式化
Python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,format方式在Python3.x使用的更加广泛。
%d
1 age = 29 2 print("my age is %d" %age) 3 #my age is 29
%s
1 name = "makes" 2 print("my name is %s" %name) 3 #my name is makes
%f
1 print("%6.3f" % 2.3) 2 #2.300 3 print("%f" %2.3) 4 #2.300000
1 print("{}:{}".format(‘192.168.0.100‘
1 print("{}:{}".format(‘192.168.0.100‘,8080)) 2 #192.168.0.100:8080
关键字映射:
实例一:
>>>
print
(
"{server}{1}:{0}"
.
format
(
8888
,
‘192.168.1.100‘
,server
=
‘Web Server Info :‘
))
Web Server Info :192.168.1.100:8080
实例一:
>>>
print
(
"{0[0]}.{0[1]}"
.
format
((
‘baidu‘
,
‘com‘
)))
baidu.com
^、<、>分别是居中、左对齐、右对齐
实例一:
>>>
print
(
"{0}*{1}={2:0>2}"
.
format
(
3
,
2
,
2
*
3
))
3*2=06
>>>
print
(
"{:*^30}"
.
format
(
‘centered‘
))
***********centered***********
实例三:
>>>
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
实例一:
>>>
print
(
"{:.3f}"
.
format
(
2.1415
))
2.142
>>>
print
(
"{:.10f}"
.
format
(
3.1415
))
3.1415000000
print('{:15}|{:^9}|{:^9}'.format('', 'lat.', 'long.'))是什么意思?
标签:contain spl image lap info 2.x gif red value
原文地址:https://www.cnblogs.com/Alliswell-WP/p/Python3_format.html