python 字符串格式化KeyError

Question

我是Python初学者，在学习字符串格式化时遇到了这个问题。代码是

Age = 22
Month = "November"
Year= 1991
Gf= "julie"
print("The age of Smith is {Age} and he was born in {Month}{Year} and his girlfriend name is 
{Gf}".format(Age,Month,Year,Gf))

当我运行它时，错误是 KeyError:'Age'。为什么会发生这种情况？

当我使用 f 字符串时它工作得很好。

Age = 22
Month = "November"
Year= 1991
Gf= "julie"
print(f"The age of Smith is {Age} and he was born in {Month}{Year} and his girlfriend name is 
{Gf}")

Answer 1

根据the Python docs :

Basic usage of the str.format() method looks like this:

>>> print('We are the {} who say "{}!"'.format('knights', 'Ni'))
We are the knights who say "Ni!"

因此，以下内容应该按预期工作:

Age = 22
Month = "November"
Year= 1991
Gf= "julie"
print("The age of Smith is {} and he was born in {}{} and his girlfriend name is {}".format(Age,Month,Year,Gf))