add exercise files for lessons 1-3

Author: s-kganz

advanced/lesson1/diagnostic.py

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+# -- Part 1: What is the output? --
+
+# 1.
+foo = "bar"
+print(foo)
+print("foo")
+ 
+ 
+ 
+#2.
+a = True
+b = False
+c = False
+ 
+if (a or b) and c: 
+	print("coffee")
+else: 
+	print("tea") 
+
+
+ 
+#3. 
+def mul(a,b):
+   return a * b
+print(a*b == mul(a,b))
+
+# -- Part 2: Loops --
+
+# 1.
+# Print each element of the list
+lis = ["Interior", "Crocodile", "Alligator", "Chevrolet"]
+for i in range(len(lis)):
+   # Your code here:
+
+
+
+# 2.
+# End the loop using ‘break’ if the age is less than 18
+age = 0
+while age < 18:
+   age = int(input("What is your age? "))
+   # Your code here
+
+
+
+# 3.
+# Set x and y so that the loop prints the numbers
+# 1, 2, 3, and 4 ONLY.
+ 
+# Your code here
+x =
+y =
+for i in range(x, y):
+   print(i)
+
+# -- Part 3: Getting Functional --
+# Write a function (also called ‘method’) to perform the indicated operation.
+
+# 1.
+'''
+Write a function that takes one number, n, as a
+parameter and returns the sum of all numbers from 1
+to n, inclusive.
+ 
+e.g.
+sum_to(1) -> 1
+sum_to(3) -> 1 + 2 + 3 -> 6
+sum_to(10) -> 55
+'''
+# Your code here
+
+
+
+
+
+# 2.
+'''
+Write a function that counts the number
+of vowels in a word.
+ 
+Vowels are any of a, e, i, o, and u
+ 
+e.g.
+count_vowels("abc") -> 1
+count_vowels("aeiou") -> 5
+count_vowels("abracadabra") -> 5
+'''
+# Your code here
+
+i = 0
+while i < 5:
+   print(i)
+   i += 1

advanced/lesson1/hello.py

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+print("Hello, world!")

advanced/lesson1/practice.py

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+'''
+This file includes practice code that should refresh
+your memory on basic Python concepts. If anything here
+looks totally out of wack, ask an instructor for help!
+
+Remove the triple quotes around each code block to run it
+'''
+# ~~ Variables and I/O ~~
+'''
+x = 9
+x += 2 # x is now 11
+print(x)
+
+a = "strings can be"
+b = " added "
+c = "like this!"
+print(a + b + c)
+
+# Get input from the user, click into the terminal to respond
+name = input("Hi there, what is your name? ")
+print("Thanks for coming, " + name + "!")
+'''
+
+# ~~ If Statements and Logic ~~
+'''
+a = True
+b = False
+
+# Not 'flips' a boolean variable
+print("a and b flipped are:")
+print('a: ' + str(not a))
+print('b: ' + str(not b))
+
+# An if statement can have two branching paths
+# Don't forget the colons!
+if a:
+    print("a is true")
+else:
+    print("a is false")
+
+# Add more outcomes with elif
+if a:
+    print("a is still true")
+elif b:
+    print("a is false but b is true")
+else:
+    print("nothing is true")
+
+# and, not, and or make if statements more complex
+if a or b:
+    print("One of a and b are true")
+if a and b:
+    print("Both a and b are true")
+if not (a or b):
+    print("Neither a nor b are true")
+'''
+
+# ~~ Loops ~~
+'''
+# There are two flavors of loops: for and while
+
+# For loops execute a set number of times
+print("Numbers from 1-10 (for loop)")
+for i in range(11):
+    print(i, end=" ")
+print()
+# While loops execute as long as a condition is true
+i = 0
+print("Numbers from 1-10 (while loop)")
+while i <= 10:
+    print(i, end=" ")
+    i += 1 # What if this was multiplication by 2?
+print()
+# A more complex while loop
+# 'break' tells Python to end the loop prematurely
+print("Some more numbers")
+i = 1
+while i < 6:
+  print(i, end=" ")
+  if i == 3:
+    break
+  i += 1
+
+print()
+'''
+
+# ~~ Functions ~~
+'''
+# Functions collect code with a common purpose in one block
+def star_staircase(steps):
+    """ 
+    I'm a comment that says what the function does
+
+    It makes a stair case of stars, like so:
+    star_staircase(3) ->
+      *
+     **
+    *** 
+    """
+    
+    for i in range(steps):
+        print(" " * (steps - i - 1), end="")
+        print("*" * (i+1))
+
+star_staircase(3)
+star_staircase(6)
+
+# star_staircase doesn't return a value, but this one does
+def pig_latin(string):
+    """
+    Translates string to pig latin under the following rules:
+    - If first letter is a vowel, simply add 'ay'
+    - If first letter is consonant, put it at the end of the word and add
+        'ay'
+    """
+    vowels = 'aeiou'
+    ay = 'ay'
+    if string[0].lower() not in vowels:
+        string += string[0]
+        string = string[1:]
+    
+    return string.lower().capitalize() + ay
+
+print(pig_latin("Hello"))
+print(pig_latin("Please"))
+'''

advanced/lesson3/files.py

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+'''
+File I/O exercises.
+'''
+
+'''
+# 1. Write a loop to write each string in the list
+#      to the file.
+
+# To make a new line, use '\n' e.g. file.write('foo\n')
+
+to_write = ["All", "my", "favorite", "things"]
+with open('write.txt', 'w') as file:
+    # Your code here
+
+print("Finished exercise 1")
+'''
+
+'''
+# 2. Read each line from read.txt and print its length
+#      on screen.
+# Expected output:
+# ---------------------
+# 2
+# 3
+# 4
+
+with open('read.txt', 'r') as file:
+    # Your code here
+
+print("Finished exercise 2")
+'''
+
+'''
+# 3. Write each line that starts with an 'a' in mix.txt
+#      to only_a.txt
+
+# Remember, make a new line by adding '\n' e.g. file.write(line + '\n')
+
+to_write = []
+with open('mix.txt', 'r') as file:
+    # Your code here
+'''
+
+# Don't modify this code, it checks your work in exercise 3.
+
+success = True
+line_seen = False
+with open('only_a.txt', 'r') as file:
+    for line in file:
+        line_seen = True
+        if line[0] != 'a':
+            success = False
+            break
+
+if success and line_seen:
+    print("Exercise 3 correct and finished!")
+else:
+    print("Something not right with exercise 3...")

advanced/lesson3/list.txt

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+Milk
+Grapes
+Peanut butter
+Sugar
+Flour

advanced/lesson3/mix.txt

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+apple
+orange
+pear
+avocado
+fig
+plum

advanced/lesson3/only_a.txt

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+is
+not
+food

advanced/lesson3/read.txt

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+'''
+A program to read and write from a shopping list file.
+'''
+FILE = 'list.txt'
+
+while True:
+    print("Would you like to (1) view shopping list, (2) add an item, (3) remove an item, or (4) quit?")
+    choice = input("Choice: ")
+
+    if choice == '1':
+        # TODO Simply print all items in list.txt to the screen
+        print("Items in the shopping list: ")
+        
+    elif choice == '2':
+        # Get an input item from the user and append to the shopping list
+        add = input("What item to add? ")
+        
+    elif choice == '3':
+        # Get an item to remove from the user
+        remove = input("What item to remove? ")
+        
+        # TODO Read all items from the shopping list
+        items = []
+        
+
+        # TODO Write all items back into the shopping list if they are not
+        #   the item to be removed
+        
+    elif choice == '4':
+        print("Goodbye!")
+        break
+    else:
+        print("Unrecognized choice.")
+    print()

advanced/lesson3/shopping.py

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+'''
+A program to read and write from a shopping list file.
+'''
+FILE = 'list.txt'
+
+while True:
+    print("Would you like to (1) view shopping list, (2) add an item, (3) remove an item, or (4) quit?")
+    choice = input("Choice: ")
+
+    if choice == '1':
+        # TODO Simply print all items in list.txt to the screen
+        print("Items in the shopping list: ")
+        with open(FILE, 'r') as file:
+            for line in file:
+                print('-\t' + line)
+    elif choice == '2':
+        # Get an input item from the user and append to the shopping list
+        add = input("What item to add? ")
+        with open(FILE, 'a') as file:
+            file.write(add + '\n')
+    elif choice == '3':
+        # Get an item to remove from the user
+        remove = input("What item to remove? ")
+        
+        # TODO Read all items from the shopping list
+        items = []
+        with open(FILE, 'r') as file:
+            for line in file:
+                items.append(line.strip())
+        
+
+        # TODO Write all items back into the shopping list if they are not
+        #   the item to be removed
+        with open(FILE, 'w') as file:
+            for item in items:
+                if item != remove.strip():
+                    file.write(item + "\n")
+    elif choice == '4':
+        print("Goodbye!")
+        break
+    else:
+        print("Unrecognized choice.")
+    print()

advanced/lesson3/shopping_complete.py

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+print("Hello, World!")