kopia lustrzana https://github.com/animator/learn-python
Update dictionary |= operator
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README.md
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README.md
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@ -5811,6 +5811,38 @@ In case of common keys between the two operands (dictionaries), the values of th
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In the above example, both `d` and `n` shared a common key `yr`. The value corresponding to `yr` in `n` gets priority.
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The `|=` (union) augmented assignment operator can be used to update the dictionary with keys and values from another dictionary or an iterable of (key, value) pairs.
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``` python
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>>> d = {"book": "Python", "year": 1990}
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>>> dnew = {"author": "Guido"}
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>>> d |= dnew
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>>> d
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{'book': 'Python', 'year': 1990, 'author': 'Guido'}
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```
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If both the dictionaries share a common key, then the value corresponding to the key in the right operand is the updated value.
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``` python
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>>> d = {"book": "Python", "year": 1990}
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>>> dnew = {"author": "Guido", "year": 2000}
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>>> d |= dnew
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>>> d
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{'book': 'Python', 'year': 2000, 'author': 'Guido'}
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```
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In the above example, both `d` and `dnew` shared a common key `year`. The value (`1990`) corresponding to `year` in `d` is updated with the new value.
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The `|=` operator also works in case the right operand is an iterable instead of a dictionary as shown in the example below.
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``` python
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>>> d = {"book": "Python", "year": 1990}
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>>> inew = [("author", "Guido"), ("year", 2000)]
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>>> d |= inew
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>>> d
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{'book': 'Python', 'year': 2000, 'author': 'Guido'}
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```
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## Traversing a Dictionary
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Compared to position based indexing of `list` or `tuple`, dictionaries are indexed based on the key.
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