根據cookbook進行整理
a =
"hello world"
b = a.ljust(20)
#預設為填充空格，將長度擴充套件至20
print
(b)#"hello world "
c = a.ljust(20,
"*")
#在字串中填充*，將長度擴充套件至20，並將原字串左對齊
print
(c)#hello world*********
a =
"hello world"
b = a.rjust(20)
#預設為填充空格，將長度擴充套件至20
print
(b)#" hello world"
c = a.rjust(20,
"*")
#在字串中填充*，將長度擴充套件至20，並將原字串右對齊
print
(c)#*********hello world
a =
"hello world"
b = a.center(20)
#預設為填充空格，將長度擴充套件至20
print
(b)#" hello world "
c = a.center(20,
"*")
#在字串中填充*，將長度擴充套件至20，並將原字串居中
print
(c)#****hello world*****
a =
"hello world"
b =format
(a,"<20"
)#擴充套件字串長度至20，左對齊
print
(b)#"hello world "
a =
"hello world"
b =format
(a,"*<20"
)#擴充套件字串長度至20，左對齊
print
(b)#hello world*********
a =
"hello world"
b =format
(a,"<20"
)#擴充套件字串長度至20，左對齊
print
(b)#" hello world"
a =
"hello world"
b =format
(a,"*>20"
)#擴充套件字串長度至20，左對齊
print
(b)#*********hello world
a =
"hello world"
b =format
(a,"^20"
)#擴充套件字串長度至20，左對齊
print
(b)#" hello world "
a =
"hello world"
b =format
(a,"*^20"
)#擴充套件字串長度至20，左對齊
print
(b)#"****hello world*****"
a =
1.23245
b =format
(a,"<10"
)print
(b)#"1.23245 "
c =format
(a,"<10.2f"
)print
(c)#"1.23 "
a =''.
format
("hello"
,"world"
)print
(a)#" hello world"
a =
"hello world"
b ="%-20s"
%aprint
(b)#"hello world "
c ="%20s"
%aprint
(c)# hello world
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