1.format後面都是個元組類型！！！

不一一對應則報錯，比如少了一個替換的元素

括號裏可以加索引，看例2

可以用索引只取一個值，比如括號裏都是｛1｝

r = "i am {}, i am {} yearsold".format("nana",18)
print(r)

i am nana, i am 18 yearsold

r = "i am {1}, i am {0} yearsold".format("nana",18)
print(r)

i am 18, i am nana yearsold

2.註意後面用小括號，根據format語法運用符號

也可以用字典的形式，但是註意加*號以及中括號，比如例2

r = "i am {name}, i am {age} yearsold".format(name = "nana",age = 18)
print(r)

i am nana, i am 18 yearsold

r = "i am {name}, i am {age} yearsold".format(**{"name": "nana","age":18})
print(r)

i am nana, i am 18 yearsold

3.

字符串format格式方式