5l99-dictionary-view.md

Dictionary View

#python #efficiency #programming #language

• It is high performance operations on dictionaries
• If the object changes the view changes as well.
• It is iterable

>>> d = dict(a=10, b=20, c=30)
>>> values = d.values()
>>> values
dict_values([10, 20, 30])
>>> len(values)
3
>>> list(values)
[10, 20, 30]
>>> reversed(values)
<dict_reversevalueiterator object at 0x10e9e7310>
>>> values[0]
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
TypeError: 'dict_values' object is not subscriptable

References

• Ramalho, 2033, p101-103