6_8_exercise-loop-solution.py

#!/usr/bin/env python3
# -*- coding: utf-8 -*-
"""
Created on Sun Oct 20 08:50:32 2019

@author: Giles
"""

'''
Question 1
Ask the user for two numbers between 1 and 100. Then count from the 
lower number to the higher number. Print the results to the screen.
'''
#num_1 = int(input('Please enter a number between 1-100:> '))
#num_2 = int(input('Please enter a number between 1-100:> '))
# 
#while num_1 < 0 or num_2 < 0 or num_1 > 100 or num_2 > 100 or num_1 == num_2:
#    print('Numbers must be different values between 1 and 100, try again')
#    num_1 = int(input('Please enter a number between 1-100:> '))
#    num_2 = int(input('Please enter a number between 1-100:> '))
#    
#if num_1 < num_2:
#    for i in range(num_1,num_2+1):
#        print(i,end=' ')
#else:
#    for i in range(num_2,num_1+1):
#        print(i,end=' ')

'''
Question 2
Ask the user to input a string and then print it out to the screen in
reverse order (use a for loop).
'''
  
#word = input('Please enter a word:> ')
#reverse_string = ''
#for char in word:
#    reverse_string = char + reverse_string
#    
#print(reverse_string)    
    
#print(word[::-1]) 

'''
Question 3
Ask the user for a number between 1 and 12 and then display a times
table for that number.
'''

#user_input = input('Please enter a number between 1 and 12:> ')
#
#while (not user_input.isdigit()) or (int(user_input) < 1 or int(user_input) >12):
#    print('Must be an integer between 1 and 12')
#    user_input = input('Please make selection:> ' )
#user_input = int(user_input)
#print('===============================')
#print()
#print(f'This is the {user_input} times table')
#print()
#for i in range(1,13):
#    print(f'{i} x {user_input} = {i*user_input}')

'''
Question 4
Can you amend the solution to question 3 so that it just prints out all
times tables between 1 and 12? (no  need to ask user for input)
'''
#for i in range(1,13):
#    print('===============================')
#    print()
#    print(f'This is the {i} times table')
#    print()
#    for j in range(1,13):
#        print(f'{j} x {i} = {j*i}')

'''
Question 5
Ask the user to input a sequence of numbers. Then calculate the mean
and print the result
'''
#user_input = input('Please enter a number type exit to stop:> ')
#numbers = []
#while user_input.lower() != 'exit':
#    while not user_input.isdigit():
#        print('That is not a number! Numbers only please:> ')
#        user_input = input('Try again:> ')
#    numbers.append(int(user_input))
#    user_input = input('Please enter next number:> ')
#total = 0
#for number in numbers:
#    total += number
#
#print(f'Mean is {total/len(numbers)}')    
#print(sum(numbers)/len(numbers))


'''
Question 6
Write code that will calculate 15 factorial. (factorial is product of 
positive ints up to a given number. e.g 5 factorial is 5x4x3x2x1)
'''

#n = 15
#fact = 1
#for i in range(1,n+1):
#    fact = fact * i
#    
#print(fact)   
# Can you modify the code to ask user for input first?
'''
Question 7
Write code to calculate Fibonacci numbers. Create list containing 
first 20 Fibonacci numbers, (Fib  numbers made by sum of preceeding
two. Series starts 0 1 1 2 3 5 8 13 ....)
'''

### Number of fib numbers required
#n = 20
#
## Set a and b to the first two numbers in the sequence
#a = 0
#b = 1 
#
## List in which to store numbers
#fib_nums = []
#
## Use a for loop to create the sequence, repeat n times
#for i in range(n):
#    fib_nums.append(a)
#    a,b = b,a+b     
#    
#print(f'The first {n} Fibonacci numbers are, {fib_nums}')


'''
Question 8
The previous question was the first to contain comments. Go back 
through the other questions in this file and add comments to the 
solutions.
'''

'''
Question 9

     *****
     *
     **** 
     *
     *
     *
Can you draw this using python? (comment the solution code)
'''

#star = '*'
#
#for i in range(1,7):
#    for j in range(1,6):
#        if i == 1 and j < 6:
#            print(star,end='')
#        elif i == 2 and j == 1:
#            print()
#            print(star)
#        elif i == 3 and j < 5:
#            print(star,end='')
#        elif i == 4 and j == 1:
#            print()
#            print(star)  
#        elif i == 5 and j == 1:
#            print(star)
#        elif i == 6 and j == 1:
#            print(star)    

'''
Question 10
Write some code that will determine all odd and even numbers
between 1 and 100. Put the odds in a list named odd and the evens
in a list named even.
'''

# Numbers required
n = 100

# Instantiate empty lists
evens = []
odds = []

for i in range(n+1):
    if not i % 2:
        evens.append(i)
    else:
        odds.append(i)
print(f'The evens are {evens}')
print(f'The odds are {odds}')