 # Python | Loop through a dictionary of lists of values

Method # 1: Using List Comprehension
List Comprehension can be used to accomplish this particular task. It`s just shorthand for normal nested loops. we iterate over each list of keys and store the result.

 ` # Python3 code to demonstrate how it works ` ` # Looping through a dictionary of lists of values ​​` ` # Using an understanding list `   ` # Initialize dictionary ` ` test_dict ` ` = ` ` {` ` `gfg` ` `: [` ` 1 ` `, ` ` 2 ` `], ` ` `is` ` `: [` ` 4 ` `, ` ` 5 ` `], ` ` `best` ` `: [` ` 7 ` `, ` ` 8 ]} ````   # print the original dictionary print ( "The original dictionary : " +   str (test_dict))   # Using the comprehension list # Loop through a dictionary of lists of values ​​ ```` res = [[i for i in test_dict [x]] for x in test_dict.keys ()] `   ` # print result ` ` print ` ` (` ` "The list values ​​of keys are: "` ` + ` ` str ` ` (res)) `

Output:

The original dictionary: {`best`: [7, 8], `is`: [4, 5], `gfg`: [1, 2]}
The list values ​​of keys are: [[7, 8] , [4, 5], [1, 2]]

Method # 2: Using ` from_iterable () + product () + items () `
A combination of the above functions can be used to accomplish this specific task. The ` from_iterable () ` function can be used to shorten the inner loop, and the ` items ` function can be used to extract key-value pairs from a dictionary.

 ` # Python3 code to demonstrate how it works ` ` # Loop through a dictionary of lists of values ​​` ` # Using from_iterable () + product () + items () ` ` import ` ` itertools `   ` # Initialize dictionary ` ` test_dict ` ` = ` ` {` `` gfg` ` `: [` ` 1 ` `, ` ` 2 ` `], ` ` `is` ` `: [` ` 4 ` `, ` ` 5 ` `], ` ` `best` ` `: [` ` 7 ` `, ` ` 8 ` `]} `   ` # print the original dictionary ```` print ( "The original dictionary:" +   str (test_dict))   # Loop through a dictionary of lists of values ​​ # Using from_iterable () + product () + items () res = [] for key, value in ( itertools.chain.from_iterable ( [itertools.product ((k,), v) for k, v in test_dict.items ()] )): res.append (value)   # print result print ( "The list values ​​of keys are:" + str (res)) ```

Output:

The orig inal dictionary: {`best`: [7, 8], `is`: [4, 5], `gfg`: [1, 2]}
The list values ​​of keys are: [7, 8, 1, 2, 4, 5]