字串格式化（ 方式 與 format方式）

1、百分號方式

%[(name)][flags][width].[precision]typecode

typecode    必選

注：python中百分號格式化是不存在自動將整數轉換成二進位制表示的方式

#

%s可以接收字串，或任何型別
msg='
i am %s. my hobby is ball.
'%'manuel
'print
(msg)
m1='
you are so %s, %s is my lucky number.
'%('
cute
',2)
print
(m1)
#%d只能接收數字
m2='
age： %d
'%18
print
(m2)
#%f列印浮點數，.4代表保留小數點後4位
f='percent: %.4f
'%99.12345678
print
(f)#
列印百分號，用兩個百分號
p='percent: %.2f%%
'%54.157894
print
(p)#
用鍵的方式拼接字串
t3="
i am %(name)s ,age: %(age)d
"%print(t3)

2、format方式

[[fill]align][sign][#][0][width][,][.precision][type]

，            【可選】為數字新增分隔符，如：1,000,000

width       【可選】格式化位所佔寬度

.precision 【可選】小數字保留精度

type         【可選】格式化型別

傳入「 整數型別 」的引數

傳入「 浮點型或小數型別 」的引數

常用格式化：

tpl = "

i am {}, age {}, {}
".format("
seven
", 18, '
alex')
>>> i am seven, age 18, alex
tpl = "
i am {}, age {}, {}
".format(*["
seven
", 18, '
alex'])
>>> i am seven, age 18, alex 
tpl = "
i am , age , really 
".format("
seven
", 18)
>>> i am seven, age 18, really seven
tpl = "
i am , age , really 
".format(*["
seven
", 18])
>>> i am seven, age 18, really seven
tpl = "
i am , age , really 
".format(name="
seven
", age=18)
>>> i am seven, age 18, really seven
tpl = "
i am , age , really 
".format(**)
>>> i am seven, age 18, really seven
tpl = "
i am , age , really 
".format([1, 2, 3], [11, 22, 33])
>>> i am 1, age 2, really 3tpl = "
i am , age , money 
".format("
seven
", 18, 88888.1)
>>> i am seven, age 18, money 88888.100000tpl = "
i am , age 
".format(*["
seven
", 18])
>>> i am seven, age 18tpl = "
i am , age 
".format(name="
seven
", age=18)
>>> i am seven, age 18tpl = "
i am , age 
".format(**)
>>> i am seven, age 18tpl = "
numbers: ,,,,, 
".format(15, 15, 15, 15, 15, 15.87623, 2)
>>> numbers: 1111,17,15,f,f, 1587.623000%tpl = "
numbers: ,,,,, 
".format(15, 15, 15, 15, 15, 15.87623, 2)
>>> numbers: 1111,17,15,f,f, 1587.623000%tpl = "
numbers: ,,,,, 
".format(15)
>>> numbers: 1111,17,15,f,f, 1500.000000%tpl = "
numbers: ,,,,, 
".format(num=15)
>>> numbers: 1111,17,15,f,f, 1500.000000%

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