A Assignment

🧹 Strings: Functions and Methods. Simple operators

Please save your solution Exercises 1 to 8 and write your solutions in a single Python script named unit03__ex(1-8)code.py.
For Bonus Exercise 8, use a separate Python script named unit03__ex10code.py.

Save all scripts in the same unit03 folder, compress the folder into a .zip file, and upload it to ILIAS.

For more information, please visit the following link:
https://geomoer.github.io/moer-base-python/unit00/unit00-04_submission_guidelines.html

Make sure your code is clearly structured and includes comments where helpful.

Exercise 1 – Short Text Questions

Answer the following questions in complete sentences:

  • What are strings in Python?
  • What does it mean that strings are immutable?
  • What operators do you know in Python?

Exercise 2 – String Functions and Methods

Use the following text:

text = "Python is fun and powerful!"

Write code that:

  • Prints the text in uppercase
  • Prints the number of characters using len()
  • Replaces the word "fun" with "easy"
  • Splits the text into a list of words

Exercise 3 – len() and print() with multiple parameters

Use this string:

sentence = "Learning Python is exciting"

Write code that:

  • Prints the sentence two times in one line, separated by a space
  • Prints the total number of characters in the sentence (including spaces)

Exercise 4 – find() and count() with optional parameters

Use this string:

quote = "Practice makes perfect. Keep practicing to improve."

Write code that:

  • Finds the position of the first occurrence of the word "practice" (case-sensitive!)
  • Counts how many times the word "practice" appears (case-sensitive)
  • Searches for the word "e" starting from index 10
  • Counts how many times the word "e" appears between index 10 and 30

🧠 Logical Operators

Exercise 5 – Boolean Logic

Use the variables:

a = True
b = False

Calculate and print the results of:

  • a and b
  • a or b
  • not a

Add short comments explaining the output.

Exercise 6 – Logical Expression Without if

Use:

x = 150
y = 25

Create a variable result that stores the result of this logical expression:

(x > 100 or y > 100) and x > 0 and y > 0

Then print the value of result.

📊 Comparison Operators

Exercise 7 – Comparing Strings

Use:

name1 = "Alice"
name2 = "Bob"

Write code that:

  • Checks if the names are equal
  • Compares their lengths and prints which one is longer or if they are the same length

Exercise 8 – Range Check

Use a variable:

number = 35

Write code that checks whether the number is between 10 and 50, inclusive, and prints the result.

📈 Mathematical Operators

Exercise 9 – Basic Calculations

Use:

a = 12
b = 5

Perform and print the result of each of the following:

  • a + b
  • a - b
  • a * b
  • a / b
  • a % b

Exercise 10 – BONUS: Combined String Methods

Use the following string:

text = "Success is not the key to happiness. Happiness is the key to success."

Write code that:

  • Counts how many times the word "key" appears in the text (case-sensitive)
  • Finds the position of the second occurrence of the word "success" (case-insensitive)
  • Capitalizes the first letter of the sentence
  • Replaces the second "key" with the word "secret"

Hints:

  • Use .count(), .lower(), .rfind(), .capitalize(), and .replace()
  • To find the second occurrence, first find the index of the first and start a second search from just after that position

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