Python Coding Challenge - Question with Answer (ID -020326)

 

🔹 Step 1: d = {}

An empty dictionary is created.

So right now:

d = {}

There are no keys inside it.

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🔹 Step 2: print(d.get("x"))

• .get("x") tries to retrieve the value of key "x".

• Since "x" does not exist, it does NOT raise an error.

• Instead, it returns None (default value).

So this line prints:

None

👉 .get() is a safe way to access dictionary values.

You can even set a default:

d.get("x", 0)

This would return 0 instead of None.

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🔹 Step 3: print(d["x"])

• This tries to access key "x" directly.

• Since "x" is not present, Python raises:

KeyError: 'x'

So the program stops here with an error.

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 Final Output

None
KeyError: 'x'

(Program crashes after the error.)

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 Key Difference

Method	If Key Exists	If Key Missing
d.get("x")	Returns value	Returns None
d["x"]	Returns value	❌ Raises KeyError

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 Why This Is Important?

In real projects (especially APIs & data processing):

• Use .get() when you are not sure the key exists.

• Use [] when the key must exist (and error is acceptable).

1000 Days Python Coding Challenges with Explanation