21 lines
398 B
Markdown
21 lines
398 B
Markdown
---
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title: Key in dictionary
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tags: dictionary,beginner
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firstSeen: 2020-10-16T21:30:49+03:00
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lastUpdated: 2020-10-16T21:30:49+03:00
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---
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Checks if the given key exists in a dictionary.
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- Use the `in` operator to check if `d` contains `key`.
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```py
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def key_in_dict(d, key):
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return (key in d)
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```
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```py
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d = {'one': 1, 'three': 3, 'five': 5, 'two': 2, 'four': 4}
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key_in_dict(d, 'three') # True
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```
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