# Python | Get positive elements from given list of lists

Given a list of list, the task is to get only positive element from given list. Below are some ways to solve the above problem.

Method #1: Using Iteration

 `# Python code to get positive  ` `# element from list of list ` ` `  `# List Initialisation ` `Input` `=` `[[``10``, ``-``11``, ``222``], [``42``, ``-``222``, ``-``412``, ``99``, ``-``87``]] ` `Output ``=` `[] ` ` `  `# Using iteration ` `for` `elem ``in` `Input``: ` `    ``temp ``=` `[] ` `    ``for` `x ``in` `elem: ` `        ``if` `x>``0``: ` `            ``temp.append(x) ` `    ``Output.append(temp) ` `   `  `# printing output ` `print``(``"Initial List is :"``, ``Input``) ` `print``(``"Modified list is :"``, Output) `

Output:

```Initial List is : [[10, -11, 222], [42, -222, -412, 99, -87]]
Modified list is : [[10, 222], [42, 99]]
```

Method #2: Using map and list Comprehension

 `# Python code to get positive element  ` `# from list of list ` ` `  `# List Initialisation ` `Input` `=` `[[``10``, ``-``11``, ``222``], [``42``, ``-``222``, ``-``412``, ``99``, ``-``87``]] ` ` `  `# Using list comprehension and map ` `temp ``=` `map``(``lambda` `elem: ``filter``(``lambda` `a: a>``0``, elem), ``Input``) ` `Output ``=` `[[a ``for` `a ``in` `elem ``if` `a>``0``] ``for` `elem ``in` `temp] ` ` `  `# printing output ` `print``(``"Initial List is :"``, ``Input``) ` `print``(``"Modified list is :"``, Output) `

Output:

```Initial List is : [[10, -11, 222], [42, -222, -412, 99, -87]]
Modified list is : [[10, 222], [42, 99]]
```

Method #3: Using List Comprehension

 `# Python code to get positive element  ` `# from list of list ` ` `  `# List Initialisation ` `Input` `=` `[[``10``, ``-``11``, ``222``], [``42``, ``-``222``, ``-``412``, ``99``, ``-``87``]] ` ` `  `# Using list comprehension ` `Output ``=` `[ [b ``for` `b ``in` `a ``if` `b>``0``] ``for` `a ``in` `Input``] ` ` `  `# printing output ` `print``(``"Initial List is :"``, ``Input``) ` `print``(``"Modified list is :"``, Output) `

Output:

```Initial List is : [[10, -11, 222], [42, -222, -412, 99, -87]]
Modified list is : [[10, 222], [42, 99]]
```

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