How to loop through all key-value pairs in a dictionary?

To loop through all key-value pairs in a Python dictionary, you can use the items() method. Here is an example of how to iterate over all the key-value pairs in a dictionary using the items() method:

my_dict = {'key1': 'value1', 'key2': 'value2', 'key3': 'value3'}
for key, value in my_dict.items():
    print(key, value)

This will output:

key1 value1
key2 value2
key3 value3

In this example, items() returns a list of tuples, where each tuple contains a key-value pair from the dictionary. The for loop iterates over the tuples and unpacks each tuple into two variables, key and value, which you can use to access the key and value for each iteration.