Practice Using Map(), Filter(), Reduce() (6.3) - Chapter 6: Functional Programming Tools in Python

Practice: Using map(), filter(), reduce()

Lesson 6.3Functional Programming Tools in Python

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10 questions

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6 sample questions

Question 1.
What does the map() function do?
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Think transformation or modification of a list.
Question 2.
How do you filter out odd numbers from a list using filter()?
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Look for the condition you need to check.
3Question 3.
What is the output of list(map(lambda x: x + 3, [1, 2, 3]))?
- [1, 2, 3]
- [4, 5, 6]
- [2, 3, 4]
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What happens when you add 3 to each number?
4Question 4.
filter() returns all elements for which the provided function returns True.
- True
- False
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Think about the purpose of filtering elements.
Question 5.
Using map(), filter(), and reduce(), write a Python program that processes a list of temperatures in Celsius. Convert them to Fahrenheit, filter out the temperatures below freezing, and find the average of the remaining temperatures.
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Plant each step: convert, filter, then average!
Question 6.
Design a function that takes a list of strings, uses map() to find their lengths, filter() to remove strings shorter than 5 characters, and finally uses reduce() to concatenate the remaining strings.
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Focus on the sequence of operations and ensure each is appropriate for the next step.

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