python string formatting KeyError

Question

I am a beginner in Python and I was learning string formatting when I encountered this problem. The code is

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))

When I run it, the error is KeyError:'Age'. Why is it happening?

It works fine when I use an f-string.

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}")

print("The age of Smith is {0} and he was born in {1}{2} and his girlfriend name is {3}".format(Age,Month,Year,Gf)) — Devang Sanghani
– Devang Sanghani, Commented Feb 16, 2022 at 6:45
You should pass the placeholder names as well, i.e. .format(Age=Age, Month=Month, ...). — Selcuk
– Selcuk, Commented Feb 16, 2022 at 6:46

BrokenBenchmark · Accepted Answer · 2022-02-16 06:45:13Z

2

According to 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!"

So, the following should work as intended:

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))

answered Feb 16, 2022 at 6:45

BrokenBenchmark

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Comments

35308 · Accepted Answer · 2022-02-16 06:44:50Z

1

Don't put the variable names in the brakets so

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))

works

answered Feb 16, 2022 at 6:44

35308

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Comments

vikrant · Accepted Answer · 2022-02-16 07:12:25Z

0

New and Improved Way to Format Strings in Python

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

answered Feb 16, 2022 at 7:12

vikrant

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