1、format()位置参数
>>> "abcdabdef".format()
‘abcdabdef‘
>>> "abc{0}dabdef".format("YYYY","MMMM","OOOO")
‘abcYYYYdabdef‘
>>> "abc{1}dabdef".format("YYYY","MMMM","OOOO")
‘abcMMMMdabdef‘
>>> "abc{2}dabdef".format("YYYY","MMMM","OOOO")
‘abcOOOOdabdef‘
>>> "{0}abc{2}dabdef".format("YYYY","MMMM","OOOO")
‘YYYYabcOOOOdabdef‘
>>> "{1}abc{2}dabdef".format("YYYY","MMMM","OOOO")
‘MMMMabcOOOOdabdef‘
>>> "{1}abc{2}dabde{0}f".format("YYYY","MMMM","OOOO")
‘MMMMabcOOOOdabdeYYYYf‘
>>> "{1}abc{2}dabde{0}f".format("YYYY","MMMM","OOOO")
2、format()关键字参数
>>> "{x}abc{y}dabde{z}f".format(x="YYYY",y="MMMM",z="OOOO")
‘YYYYabcMMMMdabdeOOOOf‘
>>> "{x}abc{y}dabde{z}f".format(y="YYYY",z="MMMM",x="OOOO")
‘OOOOabcYYYYdabdeMMMMf‘
>>> "{x}abcdabdef".format(y="YYYY",z="MMMM",x="OOOO")
‘OOOOabcdabdef‘
3、格式化操作符 %
a、格式化字符串及其ASCII码 %c
>>> "%c" % 100
‘d‘
>>> "%c" % 105
‘i‘
>>> "%c" % 50
‘2‘
>>> "%c" % 150
‘\x96‘
b、格式化字符串 %s
>>> "%s" % "abcde"
‘abcde‘
>>> "%s%s" % ("abcde","xyzmn")
‘abcdexyzmn‘
>>> str1="abc"
>>> str2="opq"
>>> "%s + %s" % (str1,str2)
‘abc + opq‘
c、格式化整数 %d
>>> "%d" % 8
‘8‘
>>> "%d" % 8.1
‘8‘
>>> "%d" % 8.1654
‘8‘
>>> "%d" % 5421.871
‘5421‘
>>> "5421.871整数部分是：%d" % 5421.871
‘5421.871整数部分是：5421‘
d、格式化浮点数 %f
>>> "%f" % 8
‘8.000000‘
>>> "%f" % 8.45
‘8.450000‘
>>> "%f" % 8.4554987984
‘8.455499‘
>>> "%.1f" % 8.4554987984
‘8.5‘
>>> "%.2f" % 8.4554987984
‘8.46‘
>>> "%.5f" % 8.4554987984
‘8.45550‘
e、用科学计数法格式化浮点数 %e、%E
>>> "%e" % 5
‘5.000000e+00‘
>>> "%e" % 500000000000
‘5.000000e+11‘
>>> "%.1e" % 500000000000
‘5.0e+11‘
>>> "%.2e" % 500000000000
‘5.00e+11‘
>>> "%E" % 500000000000
‘5.000000E+11‘
>>> "%.2E" % 500000000000
‘5.00E+11‘
原文：https://www.cnblogs.com/liujiaxin2018/p/14192020.html