This thread is focused on filtering those words from a series of words that contain at least 2 vowels. If you want to learn how to filter values from a series, check out the thread of Filtering out values from a series.
1. Using regular expression:
- A regular expression (also known as regex or regexp) is a sequence of characters that define a search pattern. They are used to match and manipulate text.
- They consist of a combination of special characters and literals, which define a pattern to search for within a string.
- In the example code below, a pattern is defined to find at least 2 vowels in a word and then used with a list comprehension.
2. Using Python's "count()" method:
- Python’s
count()method can be used with a list comprehension to count the number of vowels for each word and place the word in the list if the count is at least 2.
3. Using a boolean array:
- In this method, we create a boolean array by counting the number of vowels in each word, and if it is at least 2, then we return a
Truefor that word. - The array is then used as a mask to filter words from the series where the value is
True.
4. Using "apply()" with custom function:
- Here, we define a custom function that returns true for a word if its vowel count is at least 2.
- We then use the
apply()method to apply this function to the series, dropping allNaNvalues usingdropna()method where the condition was not true.