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Mastering flat_map in Python with List Comprehension

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Introduction In Python, when working with nested lists or iterables, one common challenge is flattening them into a single list while applying transformations. Many programming languages provide a built-in flatMap function, but Python does not have an explicit flat_map method. However, Python’s powerful list comprehensions offer an elegant way to achieve the same functionality. This article examines implementation behavior using Python’s list comprehensions and other methods. What is flat_map ? Functional programming  flatMap is a combination of map and flatten . It transforms the collection's element and flattens the resulting nested structure into a single sequence. For example, given a list of lists, flat_map applies a function to each sublist and returns a single flattened list. Example in a Functional Programming Language: List(List(1, 2), List(3, 4)).flatMap(x => x.map(_ * 2)) // Output: List(2, 4, 6, 8) Implementing flat_map in Python Using List Comprehension Python’...
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How to Use List Function in Python

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Here's is an answer to calculate the length of the repeated lists. LIST is a principle data type in Python that holds a list of values. Usually strings.

List() Function the Real Usage

You can do various operations with Lists. The best examples are REPEAT, APPEND, INSERT, EXTEND, COUNT. Still more you can do.


Note: This question is from a test recently held by an HR company. HR firms usually ask to take an online test to filter the job-seekers.

You can find list length using list() and len() functions


IN THIS PAGE


1. Question
2. How to Find Length


Interview Question 

The '* 2' says times the list is repeated. In this question, they have given '2' times.


my_list = ['srini', 'seetha', 'rao']
b = len(list(list(list(list(list(my_list*2))))))
Print (b)


Select Answer

1. 5
2. 6
3. 7
4. None

Explanation:

  • In the first step, the '*' says, you repeated the List two times.
  • It confuses the test-taker since they have given multiple functions of the list().

How to get Length


You can code the way I did. So that you can get the length correctly. So, the answer to the question is '6'. The List is repeated twice. There's no effect of multiple lists on the list.


Result (Ubuntu Linux OS)


At the command level, the given question entered. After pressing enter, it showed the result as '6'. That means the list (which has initially '3' elements') doubled. So the list length is now '6'.


Result of Python List

References

  1. Here're the best examples on Python List
  2. Here's the complete list for your reference.

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