# Python | Convert two lists into a dictionary

• Difficulty Level : Basic
• Last Updated : 28 Nov, 2018

Interconversion between data types are usually necessary in real time applications as certain systems have certain modules which require the input in a particular data-type. Let’s discuss a simple yet useful utility of conversion of two lists into a `key:value` pair dictionary.

Method #1 : Naive Method
The basic method that can be applied to perform this task is the brute force method to achieve this. For this, simply declare a dictionary, and then run nested loop for both the lists and assign key and value pairs to from list values to dictionary.

 `# Python3 code to demonstrate  ` `# conversion of lists to dictionary ` `# using naive method ` ` `  `# initializing lists ` `test_keys ``=` `[``"Rash"``, ``"Kil"``, ``"Varsha"``] ` `test_values ``=` `[``1``, ``4``, ``5``] ` ` `  `# Printing original keys-value lists ` `print` `(``"Original key list is : "` `+` `str``(test_keys)) ` `print` `(``"Original value list is : "` `+` `str``(test_values)) ` ` `  `# using naive method ` `# to convert lists to dictionary ` `res ``=` `{} ` `for` `key ``in` `test_keys: ` `    ``for` `value ``in` `test_values: ` `        ``res[key] ``=` `value ` `        ``test_values.remove(value) ` `        ``break`   ` `  `# Printing resultant dictionary  ` `print` `(``"Resultant dictionary is : "` `+`  `str``(res)) `

Output:

```Original key list is : ['Rash', 'Kil', 'Varsha']
Original value list is : [1, 4, 5]
Resultant dictionary is : {'Varsha': 5, 'Rash': 1, 'Kil': 4}
```

Method #2 : Using dictionary comprehension
The more concise way to achieve the above method, dictionary comprehension method offers the faster and time-saving approach by reducing the lines to type.

 `# Python3 code to demonstrate  ` `# conversion of lists to dictionary ` `# using dictionary comprehension ` ` `  `# initializing lists ` `test_keys ``=` `[``"Rash"``, ``"Kil"``, ``"Varsha"``] ` `test_values ``=` `[``1``, ``4``, ``5``] ` ` `  `# Printing original keys-value lists ` `print` `(``"Original key list is : "` `+` `str``(test_keys)) ` `print` `(``"Original value list is : "` `+` `str``(test_values)) ` ` `  `# using dictionary comprehension ` `# to convert lists to dictionary ` `res ``=` `{test_keys[i]: test_values[i] ``for` `i ``in` `range``(``len``(test_keys))} ` ` `  `# Printing resultant dictionary  ` `print` `(``"Resultant dictionary is : "` `+`  `str``(res)) `

Output:

```Original key list is : ['Rash', 'Kil', 'Varsha']
Original value list is : [1, 4, 5]
Resultant dictionary is : {'Varsha': 5, 'Kil': 4, 'Rash': 1}
```

Method #3 : Using `zip()`
Most pythonic and generic method to perform this very task is by using `zip()`. This function pairs the list element with other list element at corresponding index in form of key-value pairs.

 `# Python3 code to demonstrate  ` `# conversion of lists to dictionary ` `# using zip() ` ` `  `# initializing lists ` `test_keys ``=` `[``"Rash"``, ``"Kil"``, ``"Varsha"``] ` `test_values ``=` `[``1``, ``4``, ``5``] ` ` `  `# Printing original keys-value lists ` `print` `(``"Original key list is : "` `+` `str``(test_keys)) ` `print` `(``"Original value list is : "` `+` `str``(test_values)) ` ` `  `# using zip() ` `# to convert lists to dictionary ` `res ``=` `dict``(``zip``(test_keys, test_values)) ` ` `  `# Printing resultant dictionary  ` `print` `(``"Resultant dictionary is : "` `+`  `str``(res)) `

Output:

```Original key list is : ['Rash', 'Kil', 'Varsha']
Original value list is : [1, 4, 5]
Resultant dictionary is : {'Kil': 4, 'Rash': 1, 'Varsha': 5}
```

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