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Solutions - Chapter 2

2-1: Simple Message

Assign a message to a variable, and then print that message.

simple_message.py
msg = "I love learning to use Python."
print(msg)
Output:
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.

simple_messages.py
msg = "I love learning to use Python."
print(msg)

msg = "It's really satisfying!"
print(msg)
Output:
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?”

personal_message.py
name = "eric"
msg = f"Hello {name.title()}, would you like to learn some Python today?"

print(msg)
Output:
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_cases.py
name = "eric"

print(name.lower())
print(name.upper())
print(name.title())
Output:
eric
ERIC
Eric

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."

famous_quote.py
print('Albert Einstein once said, "A person who never made a mistake')
print('never tried anything new."')
Output:
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_quote_2.py
famous_person = "Albert Einstein"

message = f'{famous_person} once said, "A person who never made a mistake never tried anything new."'

print(message)
Output:
Albert Einstein once said, "A person who never made a mistake never tried anything new."
Note

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_quote_3.py
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().

stripping_names.py
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())
Output:
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.

file_extensions.py
filename = 'python_notes.txt'
simple_filename = filename.removesuffix('.txt')

print(simple_filename)
Output:
python_notes

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.

favorite_number.py
fav_num = 42
msg = f"My favorite number is {fav_num}."

print(msg)
Output:
My favorite number is 42.