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Python – String Integer Product
• Last Updated : 25 Jun, 2020

Sometimes, while working with data, we can have a problem in which we receive a series of lists with data in string format, which we wish to find the product of each string list integer. Let’s discuss certain ways in which this task can be performed.

Method #1 : Using loop + `int()`
This is the brute force method to perform this task. In this, we run a loop for the entire list, convert each string to integer and perform product listwise and store in a separate list.

 `# Python3 code to demonstrate working of``# String Integer Product``# using loop + int()`` ` `# getting Product``def` `prod(val) :``    ``res ``=` `1` `    ``for` `ele ``in` `val:``        ``res ``*``=` `int``(ele)``    ``return` `res `` ` `# initialize list ``test_list ``=` `[[``'1'``, ``'4'``], [``'5'``, ``'6'``], [``'7'``, ``'10'``]]`` ` `# printing original list ``print``(``"The original list : "` `+` `str``(test_list))`` ` `# String Integer Product``# using loop + int()``res ``=` `[]``for` `sub ``in` `test_list:``    ``par_prod ``=` `prod(sub)``    ``res.append(par_prod)`` ` `# printing result``print``(``"List after product of nested string lists : "` `+` `str``(res))`
Output :
```The original list : [['1', '4'], ['5', '6'], ['7', '10']]
List after product of nested string lists : [4, 30, 70]
```

Method #2 : Using loop + `int()` + list comprehension
This is the shorthand with the help of which this task can be performed. In this, we run a loop on lists using list comprehension and extract product using explicit product function.

 `# Python3 code to demonstrate working of``# String Integer Product``# using loop + int() + list comprehension`` ` `# getting Product``def` `prod(val) :``    ``res ``=` `1` `    ``for` `ele ``in` `val:``        ``res ``*``=` `int``(ele)``    ``return` `res `` ` `# initialize list ``test_list ``=` `[[``'1'``, ``'4'``], [``'5'``, ``'6'``], [``'7'``, ``'10'``]]`` ` `# printing original list ``print``(``"The original list : "` `+` `str``(test_list))`` ` `# String Integer Product``# using loop + int() + list comprehension``res ``=` `[prod(sub) ``for` `sub ``in` `test_list]`` ` `# printing result``print``(``"List after product of nested string lists : "` `+` `str``(res))`
Output :
```The original list : [['1', '4'], ['5', '6'], ['7', '10']]
List after product of nested string lists : [4, 30, 70]
```

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