#!/usr/bin/env python
# coding: utf-8

# # An Introduction to Python
# ## Lists
# 
# ### This notebook contains the programming exercises for [An Introduction to Python: Lists.](https://www.youtube.com/watch?v=bUULmSg9lMc)
# 
# References:
# - Fundamentals of Python Programming. Halterman, Richard. Southern Adventist Univesity. 2018.
# 

# # Exercises
# ## Do the following problems.

# ### Jupyter Notebook Shortcuts:
# 
# There are two modes when a cell is highlighted. 
# 
# #### Command Mode: Press ESC to activate. The cell has a blue border if this mode is active. In this mode, you can add, delete, create, copy and paste cells.
# 
# - create a new cell above the current cell: a
# - create a new cell below the current cell: b
# - delete the current cell: dd
# - change the current cell’s type to “Code”: y
# - change the current cell’s type to “Markdown”: m
# 
# #### Edit Mode: Press ENTER to activate. The cell has a green border if this mode is active. In this mode, you can edit and type text into the cell.
# 
# - execute the current cell and create a new cell: SHIFT + ENTER

# #### Create a list of 5 string objects representing different types of foods. Use a for loop to iterate over the list and print the objects separated by spaces.  

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# #### Use the list created in the previous problem and demonstrate the use of append, remove and pop by adding to, removing from and popping elements from the list.

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# #### Given the list `lst = [20, 1, -34, 40, -8, 60, 1, 3]` evaluate the following expressions. Write your answers in markdown first then use code to verify your answer.
# 
# - lst[0:3] 
# - lst[4:8] 
# - lst[-5:-3]
# - lst[4:]
# - lst[:]
# - lst[:4]
# - lst[1:5] 
# - -34 in lst
# - -34 not in lst 
# - len(lst)

# #### Create the following list: [1,2,3,4,5,6,7,8]. Use slicing to obtain the following sublists:
# - [2,3,4,5]
# - [1,3,5,7]
# - [1,2,3,4,5,6] (use negative indices for this problem)
# - [1,2,3,4,5,6,7,8]
# - [8,7,6,5,4,3,2,1]
# - [6,5,4,3]

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# #### Create an empty list. 
# 
# 1) Then use a for loop to append to the list the multiples of 3 from 12 to 2340. Print out the length of this list.  
# 
# 2) Redo part 1) of this problem but use list comprehensions instead of a for loop.
# 
# 3) Use list comprehension as in part 2) but add in the additional condition that the numbers need to be a multiple of 7.

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# #### Use the built-in function `list()` and the `range()` function to create a list of even numbers from 2 to 50. 

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# #### Use `sum` to find the sum of a list created in the previous problem.

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# #### Write the list represented by each of the following list comprehension expressions. Write your answers in markdown then check with code. 
# 
# - [x + 1 for x in [2, 4, 6, 8]]
# - [10*x for x in range(5, 10)]
# - [x for x in range(10, 21) if x % 3 == 0]
# 

# #### Suppose lst = [-2,4,6,-4,-5,12,-7,5,3]. Use list comprehension to extract the positive numbers from the list.

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# #### Write a segment of code that asks the user to input a positive integer `n`. Use list comprehension to create a list `factors` which is a list of factors of `n`.

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# #### Without running the following code, can you tell what it does for a given integer `n`? (Pretty cool!)
# ```python
# [x for x in range(2, n) if n % x == 0] == []
# ```

# #### Create a list where each element of the list is another list of a student name(string) and a gpa(float). Your list should have 4 student-gpa pairs. Then use a nested loop to print out each student name and gpa, each on a different line.
# 
# One sample output:
# 
# ```python
# Mike 2.3 
# John 3.5 
# Michele 3.7 
# Carol 3.2 
# ```

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