# Python – Modify Equal Tuple Rows

Sometimes, while working with Python Records, we can have a problem in which we need to perform the modification of element records on equality of records. This can have a problem in domains that involve data. Let’s discuss certain ways in which this task can be performed.

Input :
test_list = [[(12, 5)], [(13, 2)], [(6, 7)]]
test_row = [(13, 2)]
Output : [[(12, 5)], [(13, 8)], [(6, 7)]]

Input :
test_list = [[(12, 5), (7, 6)]]
test_row = [(13, 2)]
Output : [[(12, 5), (7, 6)]]

Method #1 : Using loop + `enumerate()`
The combination of above functions can be used to solve this problem. In this, we apply brute force for performing task of checking for equality and performing required modification.

 `# Python3 code to demonstrate working of  ` `# Modify Equal Tuple Rows ` `# Using loop + enumerate() ` ` `  `# initializing list ` `test_list ``=` `[[(``12``, ``5``), (``13``, ``6``)], [(``12``, ``2``), (``13``, ``2``)]] ` ` `  `# printing original list ` `print``(``"The original list is : "` `+` `str``(test_list)) ` ` `  `# initializing check row  ` `test_row ``=` `[(``12``, ``2``), (``13``, ``2``)] ` ` `  `# Modify Equal Tuple Rows ` `# Using loop + enumerate() ` `# multiple y coordinate by 4 ` `for` `idx, val ``in` `enumerate``(test_list): ` `    ``if` `val ``=``=` `test_row: ` `        ``temp ``=` `[] ` `        ``for` `sub ``in` `val: ` `            ``ele ``=` `(sub[``0``], sub[``1``] ``*` `4``) ` `            ``temp.append(ele) ` `        ``test_list[idx] ``=` `temp ` `         `  `# printing result  ` `print``(``"List after modification : "` `+` `str``(test_list))  `

Output :

```The original list is : [[(12, 5), (13, 6)], [(12, 2), (13, 2)]]
List after modification : [[(12, 5), (13, 6)], [(12, 8), (13, 8)]]
```

Method #2 : Using list comprehension
This is yet another way in which this task can be performed. In this, we perform the task using list comprehension in a one-liner way similar to above method.

 `# Python3 code to demonstrate working of  ` `# Modify Equal Tuple Rows ` `# Using list comprehension ` ` `  `# initializing list ` `test_list ``=` `[[(``12``, ``5``), (``13``, ``6``)], [(``12``, ``2``), (``13``, ``2``)]] ` ` `  `# printing original list ` `print``(``"The original list is : "` `+` `str``(test_list)) ` ` `  `# initializing check row  ` `test_row ``=` `[(``12``, ``2``), (``13``, ``2``)] ` ` `  `# Modify Equal Tuple Rows ` `# Using list comprehension ` `# multiple y coordinate by 4 ` `res ``=` `[[(sub[``0``], sub[``1``] ``*` `4``) ``for` `sub ``in` `ele] ``if` `ele ``=``=` `test_row ``else` `ele ``for` `ele ``in` `test_list] ` `         `  `# printing result  ` `print``(``"List after modification : "` `+` `str``(res))  `

Output :

```The original list is : [[(12, 5), (13, 6)], [(12, 2), (13, 2)]]
List after modification : [[(12, 5), (13, 6)], [(12, 8), (13, 8)]]
```

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