38 lines
854 B
Markdown
38 lines
854 B
Markdown
---
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id: practical-python-1.15
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source_exercise_id: "1.15"
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title: "Membership testing (substring testing)"
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section: "1.4 Strings"
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source_path: "01_Introduction/04_Strings.md"
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source_repo: "https://github.com/dabeaz-course/practical-python"
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source_commit: "93dca856b41c61a0a0f85ae334116e4c125629ea"
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student_visible_solution: false
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has_private_solution: false
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skip: false
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---
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# Exercise 1.15: Membership testing (substring testing)
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> Source: Practical Python Programming, `01_Introduction/04_Strings.md`.
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### Exercise 1.15: Membership testing (substring testing)
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Experiment with the `in` operator to check for substrings. At the
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interactive prompt, try these operations:
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```python
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>>> 'IBM' in symbols
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?
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>>> 'AA' in symbols
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True
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>>> 'CAT' in symbols
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?
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>>>
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```
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*Why did the check for `'AA'` return `True`?*
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## 关联来源
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- [[summaries/04_Strings]]
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