How to iterate over Python dictionaries using 'for' loops?
Let’s assume the following dictionary:
my_dictionary = {
'key1': 'value1',
'key2': 'value2',
'key3': 'value3'
}
There are three main ways you can iterate over the dictionary.
Iterate over keys
If you iterate over a dictionary the same way you are iterating over a list, you will notice, that you are iterating over dictionary keys:
for k in my_dictionary:
print(k)
key1
key2
key3
This is basically the same as using the my_dictionary.keys() as the iterable in the for loop.
You can always use the k to access the value:
for k in my_dictionary.keys():
print(my_dictionary[k])
value1
value2
value3
Iterate over values
If you want to iterate over dictionary values instead of dictionary keys, you can use the my_dictionary.values() as iterable in the for loop:
for v in my_dictionary.values():
print(v)
value1
value2
value3
Iterate over both keys and values
To iterate over both keys and values, you can use the following syntax:
for k, v in my_dictionary.items():
print(k + ': ' + v)
key1: value1
key2: value2
key3: value3
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