map() function in Python - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to apply the str function to each number in the list using map().

Python

numbers = [1, 2, 3]
result = list(map([1], numbers))
print(result)

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Alen

Bint

Csum

Dstr

Attempts:

3 left

💡 Hint

Common Mistakes

Using int instead of str which does not convert numbers to strings.

Using sum which expects an iterable, not a single value.

Using len which returns length, not conversion.

The map() function applies the given function to each item in the list. Here, str converts numbers to strings.

2fill in blank

medium

Complete the code to square each number in the list using map() and a lambda function.

Python

numbers = [1, 2, 3]
squared = list(map(lambda x: x[1]2, numbers))
print(squared)

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A+

B**

C*

D-

Attempts:

3 left

💡 Hint

Common Mistakes

Using * without repeating the variable (like x*x inside lambda).

Using + which adds instead of squares.

Using - which subtracts.

The lambda function squares each number using the exponent operator **.

3fill in blank

hard

Fix the error in the code to convert all strings in the list to uppercase using map().

Python

words = ['apple', 'banana', 'cherry']
upper_words = list(map([1], words))
print(upper_words)

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Astr.upper

Bstr.upper()

Cupper

Dstr.uppercase

Attempts:

3 left

💡 Hint

Common Mistakes

Using str.upper() which calls the method immediately and causes an error.

Using upper which is undefined.

Using str.uppercase which does not exist.

Use str.upper without parentheses to pass the method itself to map().

4fill in blank

hard

Fill both blanks to create a dictionary with words as keys and their lengths as values using map().

Python

words = ['cat', 'dog', 'bird']
lengths = dict(zip(words, map([1], [2])))
print(lengths)

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Alen

Bwords

Crange(len(words))

Dstr

Attempts:

3 left

💡 Hint

Common Mistakes

Using range(len(words)) which gives indices, not words.

Using str which converts to string, not length.

Mapping over something other than the words list.

Use len to get length of each word and map it over the words list.

5fill in blank

hard

Fill all three blanks to filter and create a dictionary of words longer than 3 characters with their uppercase forms using map() and filter().

Python

words = ['cat', 'dog', 'bird', 'elephant']
filtered = filter(lambda w: len(w) [1] 3, words)
result = {w[2]: [3](w) for w in filtered}
print(result)

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A>

B==

C.upper()

Dstr.upper

Attempts:

3 left

💡 Hint

Common Mistakes

Using == instead of > in filter condition.

Using upper without calling it as a method.

Using str.upper incorrectly without parentheses.

Filter words longer than 3 using >, then create keys as words with uppercase values using str.upper method.