Python Lambda / Anonymous Function

1) Basic Lambda

Create a lambda that adds 5 to a number and print result for input 10.

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2) Two-Argument Lambda

Write a lambda to multiply two numbers. Test it with 3 and 4.

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3) Square Lambda

Use a lambda to compute the square of a number.

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4) Lambda in Variable

Assign a lambda to a variable f that returns x + 10. Call f(5).

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5) Lambda in print()

Use a lambda inside a print() to double 7.

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6) Lambda with map()

Given list [1, 2, 3, 4], use map + lambda to add 1 to each and print the new list.

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7) Lambda with filter()

From the list [1,2,3,4,5], use filter + lambda to get only even numbers.

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8) Lambda Sort Key

Sort the list of tuples [(1,3),(2,1),(3,2)] by second value using lambda.

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9) Lambda with reduce()

Use functools.reduce + lambda to compute the product of the list [1, 2, 3, 4].

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10) Double Values with Map

Use map + lambda to double each number in [3, 5, 7, 9].

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11) Filter Odd Numbers

From [2,3,4,5,6] use filter + lambda to get only odd numbers.

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12) Lambda Returning a Boolean

Create a lambda that checks if a number is > 10. Test with 7 and 15.

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13) Lambda With Default Input

Write a lambda expression that adds two numbers but supply default values if none given.

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14) Nested Lambda Call

Define a lambda that returns another lambda; use it to multiply numbers.

Example pattern:

f = lambda x: (lambda y: x * y)

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15) Increment with Lambda

Use a lambda in a loop to increment each number in a list.

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16) Lambda With String

Use a lambda to capitalize a string. Test with "hello".

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17) Tuple Transformation

Use map + lambda to turn [(1,2),(3,4)] into [3,7] (sum of pair).

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18) Filter Strings

From ["hi", "hello", "ok"], use filter + lambda to keep only strings with length > 2.

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19) Lambda Sort Strings

Sort ["cat","apple","dog"] by length using lambda.

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20) Combined Map & Filter

Given [1,2,3,4,5,6], first filter even numbers, then double them using lambda + map.

Expected pattern:

[4,8,12]

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🧠 Concepts Practiced

Topic	Example Use
Basic lambda	lambda x: x+5
Two–arg lambda	lambda x,y: x*y
Map	Transform lists
Filter	Select elements
Reduce	Aggregate values
Sort key	Custom ordering
Nested lambda	Lambdas returning lambdas

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📌 Quick Snippet Examples

Add 5 to 10

print((lambda x: x + 5)(10))

Map + Lambda

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

Filter + Lambda

nums = [1,2,3,4]
evens = list(filter(lambda x: x % 2 == 0, nums))
print(evens)

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canvil: 333f6c7d-6876-4f7e-b6ad-1bdb2233f5c1