Maps in Python

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Map

The map() function in Python is a built-in tool used to apply a function to every item of a list, tuple, or any iterable.

Transforms each element of an iterable
Returns a map object (convert to list/tuple to see output)
Faster & cleaner than loops
Wroks with lists, tuples, sets, strings, and multiple iterables

Syntax

1map(function, iterable)

▶ Output will appear here.

1. Basic Example

Convert all numbers to double

Uses map() with a lambda to transform each number in the list.

numbers = [1, 2, 3, 4]
result = map(lambda x: x * 2, numbers)
print(list(result))

▶ Output will appear here.

2. Using map() with a normal function

Applies a user-defined function to all items of an iterable.

def square(n):
 return n * n
nums = [1, 2, 3, 4]
result = map(square, nums)
print(list(result))

▶ Output will appear here.

3. map() with Two lists

Applies a function to each element of a tuple just like lists.

Example

Add two lists element-wise

a = [10, 20, 30]
b = [1, 2, 3]
result = map(lambda x, y: x + y, a, b)
print(list(result))

▶ Output will appear here.

4. map() with strings

Applies a function (like str.upper,str.lower) to each string in a list.

Convert each word to uppercase

words = ["hello", "python", "megha"]
result = map(str.upper, words)
print(list(result))

▶ Output will appear here.

5. map() with multiple data types

Converts each element of a list into another type (e.g., numbers to strings).

Convert list of numbers → strings

nums = [10, 20, 30]
result = map(str, nums)
print(list(result))

▶ Output will appear here.

6. map() with Tuples

Applies a function to each element of a tuple just like lists.

map() works with any iterable, including tuples.

t = (2, 4, 6)
result = map(lambda x: x * 5, t)
print(list(result))

▶ Output will appear here.

7. map() vs for loop (why map() is better)

map() provides a shorter and cleaner alternative to loops for transforming iterables.

Using a loop:

nums = [1, 2, 3]
new_list = []
for n in nums:
 new_list.append(n * 2)
print(new_list)

▶ Output will appear here.

Using map():

nums = [1, 2, 3]
result = map(lambda x: x * 2, nums)
print(list(result))

▶ Output will appear here.

Maps in Python

Map

Syntax

1. Basic Example

Convert all numbers to double

2. Using map() with a normal function

3. map() with Two lists

4. map() with strings

5. map() with multiple data types

6. map() with Tuples

7. map() vs for loop (why map() is better)

Using a loop:

Using map():

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