Add practice problems/solutions to Ch.9-11

Author: Neha Peddinti

2_intermediate/chapter10/practice/address.py

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+"""
+Address
+
+Create a 2D list where each row represents a
+person and has 3 elements: their name, their age,
+and their address.
+
+The entire list should have 4 such entries (4 people),
+so it will be a 4x3 list.
+
+Display the name and address of the 2nd person in the list.
+
+Then, display the entire list with the format:
+name (age): address
+"""
+
+# Insert your code here.

2_intermediate/chapter10/practice/random_grid.py

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+"""
+Random Grid
+
+Create a 2D list with 4 rows and a randomly
+determined number of columns. The column
+number should be a random EVEN number between
+2 and 16 (inclusive).
+
+All the even column numbers (including 0) should
+be filled with asterisks (*). The odd numbered
+columns should be filled with underscores (_).
+
+Display the grid at the end by printing out
+elements individually: don't use print(list).
+Assume that you don't know the size of the grid
+beforehand. In other words, if you wanted to display
+the 2D list without knowing the number of rows and
+columns in it, how would you code this?
+
+For example, a 4x6 grid would display this:
+*_*_*_
+*_*_*_
+*_*_*_
+
+This might be useful:
+print("a")
+print("a")
+would display the "a"s with newlines:
+a
+a
+
+print("a", end=" ")
+print("a")
+changes the end of the first "a" from a newline to a space.
+The output is this:
+a a
+
+"""
+
+# Insert your code here.

2_intermediate/chapter10/solutions/address.py

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+"""
+Address
+
+Create a 2D list where each row represents a
+person and has 3 elements: their name, their age,
+and their address.
+
+The entire list should have 4 such entries (4 people),
+so it will be a 4x3 list.
+
+Display the name and address of the 2nd person in the list.
+
+Then, display the entire list with the format:
+name (age): address
+"""
+
+contacts = [
+    ["Jeremy", 10, "45 Pancake Road"],
+    ["Nicey", 18, "111 Cupcake Street"],
+    ["Hawthorne", 15, "19 Sinister Avenue"],
+    ["Nilah", 14, "Banks of the Nile River"]
+]
+
+# 2nd person
+print(contacts[1][0] + ": " + contacts[1][2])
+print()
+
+# Display the entire list.
+for contact in contacts:
+    print(
+        contact[0] + " (%d): " % contact[1] + contact[2]
+    )

2_intermediate/chapter10/solutions/random_grid.py

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+"""
+Random Grid
+
+Create a 2D list with 4 rows and a randomly
+determined number of columns. The column
+number should be a random EVEN number between
+2 and 16 (inclusive).
+
+All the even column numbers (including 0) should
+be filled with asterisks (*). The odd numbered
+columns should be filled with underscores (_).
+
+Display the grid at the end by printing out
+elements individually: don't use print(list).
+Assume that you don't know the size of the grid
+beforehand. In other words, if you wanted to display
+the 2D list without knowing the number of rows and
+columns in it, how would you code this?
+
+For example, a 4x6 grid would display this:
+*_*_*_
+*_*_*_
+*_*_*_
+
+This might be useful:
+print("a")
+print("a")
+would display the "a"s with newlines:
+a
+a
+
+print("a", end=" ")
+print("a")
+changes the end of the first "a" from a newline to a space.
+The output is this:
+a a
+
+"""
+import random
+
+grid = []
+cols = random.randint(1, 8) * 2
+
+# Fill the grid 2D list.
+for row in range(4):
+    grid.append([])
+    for col in range(cols):
+        grid[row].append(
+            "*" if (col % 2 == 0) else "_"
+        )
+
+# Display the grid without knowing the size beforehand.
+for row in range(len(grid)):
+    for col in range(len(grid[row])):
+        print(grid[row][col], end="")
+    print()

2_intermediate/chapter11/practice/case.py

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+"""
+Case
+
+Display the string "Apple" in the following formats:
+1) normally
+2) all uppercase
+3) all lowercase
+
+Display the string "mRoWiE" in the same 3 formats.
+
+Ask the user to input a sentence, and display this
+input in the same 3 formats.
+
+Do this in AT MOST 8 lines of code.
+By the end of the program, 9 lines should have been
+displayed (3 formats for each of the 3 strings).
+
+Example of the 3 formats for one string:
+Apple
+APPLE
+apple
+"""
+
+# Insert your code here.

2_intermediate/chapter11/practice/product.py

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+"""
+Product
+
+Write a function that takes a list
+of numbers as input and returns
+the product of all the numbers in
+the list.
+
+Use it to print the products of the
+following sets of numbers:
+-1, 5, 3, 2, 8
+2.5, 3, 0
+4, 3, 7, 10
+"""
+
+# Insert your code here.

2_intermediate/chapter11/practice/rect.py

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+"""
+Rect
+
+Write a function that takes in 2 integer
+parameters: length, and width.
+
+The function should print out a rectangle of
+asterisks (*) with that length and width.
+
+Example, if the length is 5 and the width is 3,
+the function should print:
+*****
+*****
+*****
+
+Useful information:
+1)  print("a", end="")
+    removes the newline from the end of the print statement.
+2)  print("a" * 5) displays "aaaaa".
+
+Use the function to display rectangles with
+the following dimensions (with a linebreak
+between each one):
+2x6
+7x4
+3x5
+
+"""
+
+# Insert your code here.

2_intermediate/chapter11/solutions/case.py

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+"""
+Case
+
+Display the string "Apple" in the following formats:
+1) normally
+2) all uppercase
+3) all lowercase
+
+Display the string "mRoWiE" in the same 3 formats.
+
+Ask the user to input a sentence, and display this
+input in the same 3 formats.
+
+Do this in AT MOST 8 lines of code.
+By the end of the program, 9 lines should have been
+displayed (3 formats for each of the 3 strings).
+
+Example of the 3 formats for one string:
+Apple
+APPLE
+apple
+"""
+
+
+# Define a function that prints the 3 formats.
+def display(str):
+    print(str)
+    print(str.upper())
+    print(str.lower())
+
+
+display("Apple")
+display("mRoWiE")
+display(input("Enter a sentence: "))

2_intermediate/chapter11/solutions/product.py

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+"""
+Product
+
+Write a function that takes a list
+of numbers as input and returns
+the product of all the numbers in
+the list.
+
+Use it to print the products of the
+following sets of numbers:
+-1, 5, 3, 2, 8
+2.5, 3, 0
+4, 3, 7, 10
+"""
+
+
+# Define a product() function with a list parameter.
+def product(list):
+    product = 1
+    for i in list:
+        product *= i
+    return product
+
+
+# Use the function to display products, where
+# each set of numbers is given as a list.
+print(product([-1, 5, 3, 2, 8]))
+print(product([2.5, 3, 0]))
+print(product([4, 3, 7, 10]))

2_intermediate/chapter11/solutions/rect.py

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+"""
+Rect
+
+Write a function that takes in 2 integer
+parameters: length, and width.
+
+The function should print out a rectangle of
+asterisks (*) with that length and width.
+
+Example, if the length is 5 and the width is 3,
+the function should print:
+*****
+*****
+*****
+
+Useful information:
+1)  print("a", end="")
+    removes the newline from the end of the print statement.
+2)  print("a" * 5) displays "aaaaa".
+
+Use the function to display rectangles with
+the following dimensions (with a linebreak
+between each one):
+2x6
+7x4
+3x5
+
+"""
+
+
+# Define a function with length and width parameters.
+def draw_rect(length, width):
+    for row in range(width):
+        print("*" * length)
+    print()
+
+
+# Use the function to draw rectangles of various sizes.
+draw_rect(2, 6)
+draw_rect(7, 4)
+draw_rect(3, 5)