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Python Filter List Of Strings

Last Updated : Aug 23, 2023

Python Filter List Of Strings

In this article we will show you the solution of python filter list of strings, with the help of the effective built-in function "filter" in Python, you can effectively filter a list of strings according to a specified criterion.

Using the filter function to filter lists of strings is very helpful when you wish to isolate particular components from a bigger collection according to predetermined standards.

It makes the code easier to understand and enables a clear and effective solution.

You can quickly alter and extract pertinent strings from a list using Python's filter feature, which enables you to handle data more efficiently and carry out focused operations on the string subsets you want.

Now move to the concept of python filter list of strings.

Step By Step Guide On Python Filter List Of Strings :-

def filter_condition(string):
    vowels = ['a', 'e', 'i', 'o', 'u']
    if len(string) > 5:
        vowel_count = sum(1 for char in string.lower() if char in vowels)
        if vowel_count % 2 != 0:
            return True
    return False
strings = ['meena', 'reena', 'seema', 'hema', 'prema']
filtered_strings = list(filter(filter_condition, strings))
print(filtered_strings)
  1. We create the named function filter_condition, which only accepts the string parameter.
  2. The filter function's filtering condition will be this function.
  3. We begin via establishing a listing of vowels inside the characteristic, vowels, which includes the letters "a," "e," "i," "o," and "u."
  4. Next, we decide if the enter string's period exceeds five. If so, we move directly to the only that comes subsequent phase.
  5. In order to keep music of the wide variety of vowels inside the string, we initialize the variable vowel_count.
  6. We use a generator expression, 1 for char in string.lower() if char in vowels, to traverse over each individual within the lowercase variation of the string in addition to depend handiest the characters that exist in the vowels listing.
  7. The total number of vowels is then determined using the sum function.
  8. We determine if the vowel_count is odd after counting the vowels.
  9. To accomplish this, we verify whether the remainder of vowel_count divided by two is not equal to zero using the modulo operator%.
  10. If it is not equal to 0, the vowel count is odd.
  11. The function returns True, indicating that the string should be included in the filtered list, if both requirements—that is, the length of the string being larger than 5 and the count of vowels being odd—are met.
  12. We reach the function's end and return False if the conditions are not satisfied.
  13. The values ['meena','reena','seema', 'hema', and 'prema'] are contained in a list of strings named strings in the code's main section.
  14. We use the filter_condition function as the filtering condition to the strings list using the filter function.
  15. A new iterator that only contains the strings that meet the filtering requirement is returned when the filter function iterates through each element of the strings list.
  16. The filtered texts are then saved in the variable filtered_strings after the iterator has been converted to a list using list().
  17. The strings that satisfied the filtering requirement are subsequently displayed when we print the values of the variable filtered_strings.

Conclusion :-

As a result, we were able to understand the idea behind the Python filter list of strings.

We also discovered how effective the filter function in Python is at filtering a list of texts according to specific requirements.

You can quickly extract the desired strings from a larger collection by specifying a filtering condition using a lambda function or a named function.

I hope this article on python filter list of strings helps you and the steps and method mentioned above are easy to follow and implement.