Python Foundations, Lab 2: Practice with Flow Control¶

Instructor: Wesley Beckner

Solved: notebook

In this lab we will continue to practice flow control.

➿ L2 Q1: Print and For Loops¶

Create a Pyramid Using for loops

Part A¶

Example output:

* 
* * 
* * * 
* * * * 
* * * * *

# Code Cell for L2 Q1 A

Part B¶

Example output:

        * 
      * * 
    * * * 
  * * * * 
* * * * *

# Code Cell for L2 Q1 B

Part C¶

Example output:

         * 
        * * 
       * * * 
      * * * * 
     * * * * *

# Code Cell for L2 Q1 C

         * 
        * * 
       * * * 
      * * * * 
     * * * * * 
    * * * * * * 
   * * * * * * * 
  * * * * * * * * 
 * * * * * * * * *

🔙 L2 Q2: Conditionals and For Loops¶

Complete the Fibonacci sequence up to the 10^th place using any or all of the following:

for
if elif else
append
range

The Fibonacci sequence with indices:

0
1
1
2
3
5
8
etc..

Example input:

index = 10

Example output:

Index: 10
Value: 34

# Cell for L2 Q2

🧺 L2 Q3: Practice with Collections¶

concatenate the following dictionaries to create a new one. If you need to, refer to documentation for python dictionaries!

Input:

dict1={1:10, 2:20}
dict2={3:30, 4:40}
dict3={5:50, 6:60}

Output:

new_dict={1:10, 2:20, 3:30, 4:40, 5:50, 6:60}

# Cell for L2 Q3

🐝 L2 Q4 The FizzBuzz task¶

Let's do this! FizzBuzz is our first task for this session. FizzBuzz is a common toy programming problem that is often used in software engineering job interviews. Today, we are not after the most compact, most clever, or even the most beautiful solution. Your goal is to solve the problem using for and if as your primary tools. You will likely also want to use the % operator. Before we describe FizzBuzz, let's talk about the moduluo operation.

If you recall from session 1, you may have experimented with the modulus or % operator. When used between two integer values, it returns the integer remainder of division. Let's start with a simple example of 5 modulo 3:

5 % 3

5 % 3

Let's do another example... What is the result of the following:

10 % 5

10 % 5

Now, on to FizzBuzz. No it isn't the high-test caffeine cola you might need right now. Instead, it is a challenge to output certain text as the code iterates over elements in a list. Here is the formal definition of the problem that we will use today.

"Write a program that prints the numbers from 1 to 100. But for multiples of three print Fizz instead of the number and for the multiples of five print Buzz. For numbers which are multiples of both three and five print FizzBuzz."

To get started, you will need a for loop and it will probably use a range list. Inside of the for loop, you will likely have at least two if statements that use the % operator followed by a print.

# Cell for L2 Q4

For advanced folks, a hint here is that you might be able to avoid some if statements by using the end parameter to the print function. Notice how these two cell blocks output differently.

print("Fizz")
print("Buzz")

In another cell:

print("Fizz", end="")
print("Buzz", end="")
print()