Solutions — Chapter 2
Assign a message to a variable, and then print that message.
msg = "I love learning to use Python." print(msg) I love learning to use Python. 2-2: Simple Messages
Assign a message to a variable, and print that message. Then change the value of the variable to a new message, and print the new message.
msg = "I love learning to use Python." print(msg) msg = "It's really satisfying!" print(msg) I love learning to use Python. It's really satisfying! 2-3: Personal Message
Use a variable to represent a person’s name, and print a message to that person. Your message should be simple, such as, “Hello Eric, would you like to learn some Python today?”
name = "eric" msg = f"Hello name.title()>, would you like to learn some Python today?" print(msg) Hello Eric, would you like to learn some Python today? 2-4: Name Cases
Use a variable to represent a person’s name, and then print that person’s name in lowercase, uppercase, and title case.
name = "eric" print(name.lower()) print(name.upper()) print(name.title()) 2-5: Famous Quote
Find a quote from a famous person you admire. Print the quote and the name of its author. Your output should look something like the following, including the quotation marks:
Albert Einstein once said, «A person who never made a mistake never tried anything new.»
print('Albert Einstein once said, "A person who never made a mistake') print('never tried anything new."') Albert Einstein once said, "A person who never made a mistake never tried anything new." 2-6: Famous Quote 2
Repeat Exercise 2-5, but this time, represent the famous person’s name using a variable called famous_person . Then compose your message and represent it with a new variable called message . Print your message.
famous_person = "Albert Einstein" message = f'famous_person> once said, "A person who never made a mistake never tried anything new."' print(message) Albert Einstein once said, "A person who never made a mistake never tried anything new." The line that defines message in this file is longer than we’d typically like to write. You’ll see this a little later in Chapter 7, but you can add to a string using the += operator. So this program could also be written like this, with exactly the same output:
famous_person = "Albert Einstein" message = f'famous_person> once said, "A person who never made a mistake' message += ' never tried anything new."' print(message) 2-7: Stripping Names
Use a variable to represent a person’s name, and include some whitespace characters at the beginning and end of the name. Make sure you use each character combination, «\t» and «\n» , at least once.
Print the name once, so the whitespace around the name is displayed. Then print the name using each of the three stripping functions, lstrip() , rstrip() , and strip() .
name = "\tEric Matthes\n" print("Unmodified:") print(name) print("\nUsing lstrip():") print(name.lstrip()) print("\nUsing rstrip():") print(name.rstrip()) print("\nUsing strip():") print(name.strip()) Unmodified: Eric Matthes Using lstrip(): Eric Matthes Using rstrip(): Eric Matthes Using strip(): Eric Matthes 2-8: File Extensions
Python has a removesuffix() method that works exactly like removeprefix() . Assign the value ‘python_notes.txt’ to a variable called filename . Then use the removesuffix() method to display the filename without the file extension, like some file browsers do.
filename = 'python_notes.txt' simple_filename = filename.removesuffix('.txt') print(simple_filename) 2-10: Favorite Number
Use a variable to represent your favorite number. Then, using that variable, create a message that reveals your favorite number. Print that message.
fav_num = 42 msg = f"My favorite number is fav_num>." print(msg)