200-901 Software Development and Design Practice Question
Which Python exception would be raised by the following code?
my_dict = {'a': 1} value = my_dict['b']
⚠ Common exam trap
Cisco often tests the distinction between KeyError and IndexError, trapping candidates who confuse dictionary key access with list index access, especially when the code uses square brackets in both contexts.
Answer choices
Why each option matters
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
KeyError
Accessing a dictionary key that does not exist raises a KeyError in Python. In the code, my_dict['b'] attempts to retrieve the value for key 'b', which is not present in the dictionary {'a': 1}, so Python raises KeyError.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✓
KeyError
Why this is correct
Correct.
- ✗
ValueError
Why it's wrong here
Wrong type.
- ✗
IndexError
Why it's wrong here
For list index.
- ✗
AttributeError
Why it's wrong here
Attribute not found.
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JA
Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
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