PCAP Strings Practice Question
Which string method would you use to check if a string starts with a specified prefix?
⚠ Common exam trap
The PCAP exam often tests the exact method name spelling and punctuation, so the trap here is that candidates may confuse `startswith()` with the non-existent `start_with()` or `beginswith()` due to familiarity with other languages or naming conventions.
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
✓
startswith()
The correct method to check if a string starts with a specified prefix in Python is `str.startswith()`. It returns `True` if the string begins with the given prefix, otherwise `False`. This method is part of the standard string methods in Python and is case-sensitive by default.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
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start_with()
Why it's wrong here
start_with() is not a valid Python string method. The standard library uses the compact name startswith, without an underscore between 'start' and 'with'. If you call start_with(), Python raises AttributeError because it is not defined on the str class, so this option cannot be used for prefix checking.
- ✓
startswith()
Why this is correct
startswith() is the correct and documented Python string method for prefix detection. It returns True if the string begins with the specified prefix and False otherwise. It also accepts a tuple of prefixes to check multiple alternatives, and optional start and end parameters to limit the search range within the string.
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beginswith()
Why it's wrong here
beginswith() is not a real Python string method. While English speakers might expect such a natural phrase, Python's API has no beginswith method on str objects. Calling it will produce an AttributeError, so it cannot be used to test whether a string begins with a certain substring.
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startwithcase()
Why it's wrong here
startwithcase() is not a recognized Python string method. There is no method with that name in the str class, and the suffix 'case' is misleading because prefix matching in Python is case-sensitive by default. For case-insensitive matching, you would need to call startswith() after normalizing the string, not use a nonexistent 'case' variant.
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