Python | Calculate difference between adjacent elements in given list

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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