ryanorsinger/list_comprehension_practice.py

## list_comprehension_practice.py
# 17 list comprehension problems in python

fruits = ['mango', 'kiwi', 'strawberry', 'guava', 'pineapple', 'mandarin orange']

numbers = [2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 13, 17, 19, 23, 256, -8, -4, -2, 5, -9]

# Example for loop solution to add 1 to each number in the list
numbers_plus_one = []
for number in numbers:
    numbers_plus_one.append(number + 1)

# Example of using a list comprehension to create a list of the numbers plus one.
numbers_plus_one = [number + 1 for number in numbers]

# Example code that creates a list of all of the list of strings in fruits and uppercases every string
output = []
for fruit in fruits:
    output.append(fruit.upper())

# Exercise 1 - rewrite the above example code using list comprehension syntax. Make a variable named uppercased_fruits to hold the output of the list comprehension. Output should be ['MANGO', 'KIWI', etc...]

# Exercise 2 - create a variable named capitalized_fruits and use list comprehension syntax to produce output like ['Mango', 'Kiwi', 'Strawberry', etc...]

# Exercise 3 - Use a list comprehension to make a variable named fruits_with_more_than_two_vowels. Hint: You'll need a way to check if something is a vowel.

# Exercise 4 - make a variable named fruits_with_only_two_vowels. The result should be ['mango', 'kiwi', 'strawberry']

# Exercise 5 - make a list that contains each fruit with more than 5 characters

# Exercise 6 - make a list that contains each fruit with exactly 5 characters

# Exercise 7 - Make a list that contains fruits that have less than 5 characters

# Exercise 8 - Make a list containing the number of characters in each fruit. Output would be [5, 4, 10, etc... ]

# Exercise 9 - Make a variable named fruits_with_letter_a that contains a list of only the fruits that contain the letter "a"

# Exercise 10 - Make a variable named even_numbers that holds only the even numbers

# Exercise 11 - Make a variable named odd_numbers that holds only the odd numbers

# Exercise 12 - Make a variable named positive_numbers that holds only the positive numbers

# Exercise 13 - Make a variable named negative_numbers that holds only the negative numbers

# Exercise 14 - use a list comprehension w/ a conditional in order to produce a list of numbers with 2 or more numerals

# Exercise 15 - Make a variable named numbers_squared that contains the numbers list with each element squared. Output is [4, 9, 16, etc...]

# Exercise 16 - Make a variable named odd_negative_numbers that contains only the numbers that are both odd and negative.

# Exercise 17 - Make a variable named numbers_plus_5. In it, return a list containing each number plus five.

# BONUS Make a variable named "primes" that is a list containing the prime numbers in the numbers list. *Hint* you may want to make or find a helper function that determines if a given number is prime or not.
	# 17 list comprehension problems in python

	fruits = ['mango', 'kiwi', 'strawberry', 'guava', 'pineapple', 'mandarin orange']

	numbers = [2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 13, 17, 19, 23, 256, -8, -4, -2, 5, -9]

	# Example for loop solution to add 1 to each number in the list
	numbers_plus_one = []
	for number in numbers:
	numbers_plus_one.append(number + 1)

	# Example of using a list comprehension to create a list of the numbers plus one.
	numbers_plus_one = [number + 1 for number in numbers]

	# Example code that creates a list of all of the list of strings in fruits and uppercases every string
	output = []
	for fruit in fruits:
	output.append(fruit.upper())

	# Exercise 1 - rewrite the above example code using list comprehension syntax. Make a variable named uppercased_fruits to hold the output of the list comprehension. Output should be ['MANGO', 'KIWI', etc...]

	# Exercise 2 - create a variable named capitalized_fruits and use list comprehension syntax to produce output like ['Mango', 'Kiwi', 'Strawberry', etc...]

	# Exercise 3 - Use a list comprehension to make a variable named fruits_with_more_than_two_vowels. Hint: You'll need a way to check if something is a vowel.

	# Exercise 4 - make a variable named fruits_with_only_two_vowels. The result should be ['mango', 'kiwi', 'strawberry']

	# Exercise 5 - make a list that contains each fruit with more than 5 characters

	# Exercise 6 - make a list that contains each fruit with exactly 5 characters

	# Exercise 7 - Make a list that contains fruits that have less than 5 characters

	# Exercise 8 - Make a list containing the number of characters in each fruit. Output would be [5, 4, 10, etc... ]

	# Exercise 9 - Make a variable named fruits_with_letter_a that contains a list of only the fruits that contain the letter "a"

	# Exercise 10 - Make a variable named even_numbers that holds only the even numbers

	# Exercise 11 - Make a variable named odd_numbers that holds only the odd numbers

	# Exercise 12 - Make a variable named positive_numbers that holds only the positive numbers

	# Exercise 13 - Make a variable named negative_numbers that holds only the negative numbers

	# Exercise 14 - use a list comprehension w/ a conditional in order to produce a list of numbers with 2 or more numerals

	# Exercise 15 - Make a variable named numbers_squared that contains the numbers list with each element squared. Output is [4, 9, 16, etc...]

	# Exercise 16 - Make a variable named odd_negative_numbers that contains only the numbers that are both odd and negative.

	# Exercise 17 - Make a variable named numbers_plus_5. In it, return a list containing each number plus five.

	# BONUS Make a variable named "primes" that is a list containing the prime numbers in the numbers list. Hint you may want to make or find a helper function that determines if a given number is prime or not.