# Python – Convert Key-Value list Dictionary to List of Lists

• Last Updated : 22 Apr, 2020

Sometimes, while working with Python dictionary, we can have a problem in which we need to perform the flattening a key value pair of dictionary to a list and convert to lists of list. This can have applications in domains in which we have data. Lets discuss certain ways in which this task can be performed.

Method #1 : Using loop + `items()`
This brute force way in which we can perform this task. In this, we loop through all the pairs and extract list value elements using items() and render in a new list.

 `# Python3 code to demonstrate working of ``# Convert Key-Value list Dictionary to Lists of List``# Using loop + items()`` ` `# initializing Dictionary``test_dict ``=` `{``'gfg'` `: [``1``, ``3``, ``4``], ``'is'` `: [``7``, ``6``], ``'best'` `: [``4``, ``5``]}`` ` `# printing original dictionary``print``(``"The original dictionary is : "` `+` `str``(test_dict))`` ` `# Convert Key-Value list Dictionary to Lists of List``# Using loop + items()``res ``=` `[]``for` `key, val ``in` `test_dict.items():``    ``res.append([key] ``+` `val)`` ` `# printing result ``print``(``"The converted list is : "` `+` `str``(res)) `
Output :

The original dictionary is : {‘gfg’: [1, 3, 4], ‘is’: [7, 6], ‘best’: [4, 5]}
The converted list is : [[‘gfg’, 1, 3, 4], [‘is’, 7, 6], [‘best’, 4, 5]]

Method #2 : Using list comprehension
This task can also be performed using list comprehension. In this, we perform the task similar to above method just in one-liner shorter way.

 `# Python3 code to demonstrate working of ``# Convert Key-Value list Dictionary to Lists of List``# Using list comprehension`` ` `# initializing Dictionary``test_dict ``=` `{``'gfg'` `: [``1``, ``3``, ``4``], ``'is'` `: [``7``, ``6``], ``'best'` `: [``4``, ``5``]}`` ` `# printing original dictionary``print``(``"The original dictionary is : "` `+` `str``(test_dict))`` ` `# Convert Key-Value list Dictionary to Lists of List``# Using list comprehension``res ``=` `[[key] ``+` `val ``for` `key, val ``in` `test_dict.items()]`` ` `# printing result ``print``(``"The converted list is : "` `+` `str``(res)) `
Output :

The original dictionary is : {‘gfg’: [1, 3, 4], ‘is’: [7, 6], ‘best’: [4, 5]}
The converted list is : [[‘gfg’, 1, 3, 4], [‘is’, 7, 6], [‘best’, 4, 5]]

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