5.4. Exercises#

5.4.1. Exercise 1#

Suppose that we have the following list of numbers: list_of_numbers = [1,2,3]. Then we want to insert a list of numbers at position 1. For this we execute: list_of_numbers.insert(1, [30,40]). Do you think this is valid? Will this code produce any errors? What will happen after executing it? You can use the cell below to check your answer.

# write your code here

5.4.2. Exercise 2#

Suppose that someone has given us the following list of wrongly mixed fermented food and drinks: fermented_food = ['milk', 'yoghurt', 'beer', 'cider', 'tempeh', 'sauerkraut', 'kefir']. Our task is to have the food in one list and the drinks in another one. Find a way to separate them by using list comprehension.

# write your code here

5.4.3. Exercise 3#

# write function here

# write function calls here

5.4.4. Exercise 4#

You are given the following list of numbers: [10,20,24,45,30,10,32,20,14,8,9,12,24,20,12,3]. Write a function to find the first and last indices of a given key value (passed as argument) in a list this time using the index() method. Hint: Function definition may look something like: def find_key_2(key, list). Also the function should return a tuple containing the first and last indices.

# write function here

# write code here

5.4.5. Exercise 5#

Variables a and b mistakenly were assigned values a = 3 and b = 5. The correct version would be: a = 5 and b = 3. Use sequence unpacking to correct this.

# write your code here

5.4.6. Exercise 6#

What happens when you make a shallow copy of a tuple and then change one of the tuples? Where will the changes be reflected?

# write answer here - you can write code to test your reasoning as well

5.4.7. Exercise 7 (Optional)#

You are given a list of values: [1,2,3,4,5,6,7,8,9] and need to find which of the squares of any of the values are divisible by 2. Use a lambda expression to find out. Hint: the iterable of the map() function has to be used as input to the filter() function.

# write your code here

Python for Food Scientists

Exercises

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