Python | N consecutive Odd or Even Numbers

The problem focused in this article is quite specific and may be less useful in different domains. But the way this is going to solve may open doors to solve potentially like problems, hence making it worth a read. This article solves the problem of testing if a list contains series of odd or even elements. Let’s discuss certain ways in which this problem can be solved.

Method #1 : Using `sum()` + list comprehension + `zip() + any()`

This problem can be solved using the combination of above functions. This method solves problem in 2 steps. In 1st step, we compute all the possible pairs of N using list comprehension and zip function and in the second step we use sum and any function to test for N divisible result, if we find any one of it, we return positive.

 `# Python3 code to demonstrate ` `# N consecutive Odd or Even Numbers ` `# using sum() + zip() + any() + list comprehension ` ` `  `# initializing list ` `test_list ``=` `[``1``, ``5``, ``6``, ``4``, ``8``] ` ` `  `# printing original list ` `print``(``"The original list : "` `+` `str``(test_list)) ` ` `  `# initializing N  ` `N ``=` `3` ` `  `# using sum() + zip() + any() + list comprehension ` `# N consecutive Odd or Even Numbers ` `temp ``=` `( test_list[i : i ``+` `N] ``for` `i ``in` `range``(``len``(test_list) ``-` `N ``+` `1``) ) ` `res ``=` `any``( ``sum``(ele ``%` `2` `for` `ele ``in` `temps) ``%` `N ``=``=` `0` `for` `temps ``in` `temp ) ` ` `  `# print result ` `print``(``"Does list contain the desired consecution : "` `+` `str``(res)) `

Output :

```The original list : [1, 5, 6, 4, 8]
Does list contain the desired consecution : True
```

Method #2 : Using `groupby() + any()`

The whole logic of doing the 1st step in the above method can be managed using the groupby function in which we perform the grouping and any function can be used later for checking the consecution.

 `# Python3 code to demonstrate ` `# N consecutive Odd or Even Numbers ` `# using groupby() + any() ` `from` `itertools ``import` `groupby ` ` `  `# initializing list ` `test_list ``=` `[``1``, ``5``, ``6``, ``4``, ``8``] ` ` `  `# printing original list ` `print``(``"The original list : "` `+` `str``(test_list)) ` ` `  `# initializing N  ` `N ``=` `3` ` `  `# using groupby() + any() ` `# N consecutive Odd or Even Numbers ` `res ``=` `any``(``len``(``list``(sub)) ``=``=` `N ``for` `idx, sub ``in` `     ``groupby([sub ``%` `2` `for` `sub ``in` `test_list])) ` ` `  `# print result ` `print``(``"Does list contain the desired consecution : "` `+` `str``(res)) `

Output :

```The original list : [1, 5, 6, 4, 8]
Does list contain the desired consecution : True
```

My Personal Notes arrow_drop_up

Check out this Author's contributed articles.

If you like GeeksforGeeks and would like to contribute, you can also write an article using contribute.geeksforgeeks.org or mail your article to contribute@geeksforgeeks.org. See your article appearing on the GeeksforGeeks main page and help other Geeks.

Please Improve this article if you find anything incorrect by clicking on the "Improve Article" button below.

Article Tags :

Be the First to upvote.

Please write to us at contribute@geeksforgeeks.org to report any issue with the above content.