用法：

它通過{}和:來代替?zhèn)鹘y(tǒng)%方式

1、使用位置參數(shù)

要點(diǎn)：從以下例子可以看出位置參數(shù)不受順序約束，且可以為{},只要format里有相對(duì)應(yīng)的參數(shù)值即可,參數(shù)索引從0開，傳入位置參數(shù)列表可用*列表

 li = ['hoho',18]
'my name is {} ,age {}'.format('hoho',18)
# 'my name is hoho ,age 18'
'my name is {1} ,age {0}'.format(10,'hoho')
# 'my name is hoho ,age 10'
'my name is {1} ,age {0} {1}'.format(10,'hoho')
# 'my name is hoho ,age 10 hoho'
'my name is {} ,age {}'.format(*li)
# 'my name is hoho ,age 18'

2、使用關(guān)鍵字參數(shù)

要點(diǎn)：關(guān)鍵字參數(shù)值要對(duì)得上，可用字典當(dāng)關(guān)鍵字參數(shù)傳入值，字典前加**即可

hash = {'name':'hoho','age':18} 
'my name is {name},age is {age}'.format(name='hoho',age=19)
'my name is hoho,age is 19'
'my name is {name},age is {age}'.format(**hash) 
'my name is hoho,age is 18'

3、填充與格式化
:[填充字符][對(duì)齊方式 <^>][寬度]

 '{0:*>10}'.format(10)  ##右對(duì)齊 '********10'
 '{0:*<10}'.format(10)  ##左對(duì)齊 '10********'
 '{0:*^10}'.format(10)  ##居中對(duì)齊 '****10****'</pre>

4、精度與進(jìn)制

>>> '{0:.2f}'.format(1/3) 
'0.33'
>>> '{0:b}'.format(10)    #二進(jìn)制
'1010'
>>> '{0:o}'.format(10)     #八進(jìn)制
'12'
>>> '{0:x}'.format(10)     #16進(jìn)制
'a'
>>> '{:,}'.format(12369132698)  #千分位格式化
'12,369,132,698'

5、使用索引

name is {0[0]} age is {0[1]}'.format(li) '
name is hoho age is 18</pre>

@2018-01-31 08:46:09-晴天-寫日志的時(shí)候format存貨不夠用了。。