5. f) Lambda Expression (Problem)

Write a python program that adds two number using python lambda expression?

Write a python program that finds the cube of a number using lambda expression?

You are given a list of numbers.

Write a python program that uses lambda expressions to create a function that can be used to double a given value. Create a new list with the new values and display it.

Write a python program to find the sum of values in a list using python lambda function?

Write a python program that finds intersection of two array using lambda expression?

Note: This is an advanced use of the filter function. If you’re a complete beginner to programming then it is recommended that you skip this example until you’ve run through the whole course once.

Hint: Recall that filter function returns you a list. How does it create that list? By using the following method:

filter( how_do_I_decide_function, list1)

The filter is going to take 2 params. (1) The first is a function that returns either True or False. (2) The second is a list.

How filter works is that it takes each element from list1 –> puts it into the given function.

• If the function returns True, the element is filtered (or kept).
• If the function returns False, the element is rejected (it won’t be present in the final list)

The final list is returned back.

Given a list of dictionaries:

list1 = [{ “name” : “Lechuck”, “age” : 25},
{ “name” : “Wally”, “age” : 8 },
{ “name” : “Guybrush” , “age” : 19 }]

Write a python program to sort list by the dictionary’s age values.

Hint: This will become a lot simpler if you use the lambda function and the sorted function.

Hint 2: 

To help you recall, sorted works in the following way:
sorted( list_that_needs_sorting, key = key_function )

key_function = The key function will be consuming each element from the list and return
back a different value. In this case, key_function takes a dictionary
and should return back the value of “age”.

Sorted will pick up each element from the list and pass it to the key_function. It will
collect all the returned values and sort the original list in the same way
as it would sort this list.

Write a python program to show the odd numbers from a list using a lambda expression and the filter function?

Given:  li = [5, 7, 22, 97, 54, 62, 77, 23, 73, 61]

Hint:

To help you recall, filter function has the following syntax:

filter( function_which_helps_decide_True_or_False – AKA whether to keep the element or discard it   ,    the list to be filtered )

Write a python program that uses a filter function to filter all vowels from a tuple containing number of alphabets?

Given:

sequence = [‘b’, ‘e’, ‘o’, ‘j’, ‘r’, ‘s’, ‘p’, ‘r’]

Hint:

To help you recall, filter function has the following syntax:

filter( function_which_helps_decide_True_or_False – AKA whether to keep the element or discard it   ,    the list to be filtered )