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# Python | Calculate difference between adjacent elements in given list

• Last Updated : 28 Feb, 2019

Given a list, the task is to create a new list containing difference of adjacent elements in the given list.

Method #1: Using `zip()`

 `# Python code to demonstrate``# to calculate difference``# between adjacent elements in list`` ` ` ` `# initialising _list``ini_list ``=` `[``5``, ``4``, ``89``, ``12``, ``32``, ``45``]`` ` `# printing iniial_list``print``(``"intial_list"``, ``str``(ini_list))`` ` `# Calculating difference list``diff_list ``=` `[]``for` `x, y ``in` `zip``(ini_list[``0``::], ini_list[``1``::]):``    ``diff_list.append(y``-``x)``     ` `# printing difference list``print` `(``"difference list: "``, ``str``(diff_list))``       `
Output:
```intial_list [5, 4, 89, 12, 32, 45]
difference list:  [-1, 85, -77, 20, 13]
```

Method #2: Using Naive approach

 `# Python code to demonstrate``# to calculate difference``# between adjacent elements in list`` ` ` ` `# initialising _list``ini_list ``=` `[``5``, ``4``, ``89``, ``12``, ``32``, ``45``]`` ` `# printing iniial_list``print``(``"intial_list"``, ``str``(ini_list))`` ` `# Calculating difference list``diff_list ``=` `[]`` ` `for` `i ``in` `range``(``1``, ``len``(ini_list)):``    ``diff_list.append(ini_list[i] ``-` `ini_list[i``-``1``])`` ` `# printing difference list``print` `(``"difference list: "``, ``str``(diff_list))`
Output:

```intial_list [5, 4, 89, 12, 32, 45]
difference list:  [-1, 85, -77, 20, 13]
```

Method #3: Using numpy

 `# Python code to demonstrate``# to calculate difference``# between adjacent elements in list`` ` `import` `numpy as np``# initialising _list``ini_list ``=` `np.array([``5``, ``4``, ``89``, ``12``, ``32``, ``45``])`` ` `# printing iniial_list``print``(``"intial_list"``, ``str``(ini_list))`` ` `# Calculating difference list``diff_list ``=` `np.diff(ini_list)`` ` `# printing difference list``print` `(``"difference list: "``, ``str``(diff_list))`
Output:
```intial_list [ 5  4 89 12 32 45]
difference list:  [ -1  85 -77  20  13]
```

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