Enumerating a dictionary in Python
The function in Python enumerate()returns an object of enumeration type and adds a counter variable to iterate over a list or other type of collection. It makes looping over such objects easier.
When we pass an enumeration object to list()a function, we can inspect its contents. For example:
l = ["a", "b", "c"]
print(list(enumerate(l)))
Output:
[(0, 'a'), (1, 'b'), (2, 'c')]
We can also use enumerate()the function with dictionaries.
The following example shows a basic example.
d1 = {"a": 15, "b": 18, "c": 20}
for i, j in enumerate(d1):
print(i, j)
Output:
0 a
1 b
2 c
Notice that we passed the dictionary directly to enumerate()the function, which only assigned the counter variable to the dictionary's keys and not the values. So when we iterate over this object, we can only access the counter variable and the dictionary's keys.
To enumerate both keys and values at the same time, we can use the dictionary items()method. items()The method returns an object with a tuple of key-value pairs. The following example shows how we can use items()the method and enumerate()the function to access both a key and its corresponding value.
d1 = {"a": 15, "b": 18, "c": 20}
for i, (j, k) in enumerate(d1.items()):
print(i, j, k)
Output:
0 a 15
1 b 18
2 c 20
If we want only the dictionary elements without the key, we can use values()the function. It returns a list containing the dictionary values.
The following code shows how to do it.
d1 = {"a": 15, "b": 18, "c": 20}
for i, j in enumerate(d1.values()):
print(i, j)
Output:
0 15
1 18
2 20
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