Workshop: Strings and f-strings (Optional, Self-Study)¶

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From the lesson

Workshop problems for Section 03 Concepts. Build each yourself first, then expand the solution to check.

Four optional workshop problems, one per concept step, in a car scenario. The numbers line up with the steps. Self-study: the stubs say WHAT to do; check python-workshop/solutions.

Step-01: Making Strings¶

Concepts: joining strings with +, len().

Write a program that joins a brand (Honda) and a model (Civic) into a label with a space between them, prints the label, and prints its length.

Expected output

Honda Civic
11

Need a hint?

Join with + plus a " " space string; len() of "Honda Civic" is 11 because the space counts.

Show the solution

s03_workshop01_sol_making_strings.py

brand = "Honda"
model = "Civic"
label = brand + " " + model
print(label)
print(len(label))

View the full solution file on GitHub

Pages for this step: Concept | Practice | Workshop

Python Files for this step: Concept | Practice | Practice Solutions | Workshop | Workshop Solutions

Step-02: f-strings¶

Concepts: f-strings.

Write a program that uses a brand (Honda), a model (Civic), and a year (2022) with an f-string to print Honda Civic (2022).

Expected output

Honda Civic (2022)

Need a hint?

An f-string drops brand, model, and year into the text; type the literal parentheses around {year} yourself.

Show the solution

s03_workshop02_sol_fstrings.py

brand = "Honda"
model = "Civic"
year = 2022
print(f"{brand} {model} ({year})")

View the full solution file on GitHub

Pages for this step: Concept | Practice | Workshop

Python Files for this step: Concept | Practice | Practice Solutions | Workshop | Workshop Solutions

Step-03: String Methods¶

Concepts: upper(), replace().

Warning

.upper() and .replace() do not change plate in place. Strings are immutable, so each call returns a NEW string. Print the returned value (or store it in a new variable); plate itself stays "tn09xy5678".

Problem-1: Plate Case.

Write a program that, for a plate "tn09xy5678":

Task-1: print it in UPPER CASE.
Task-2: print it again with "tn" replaced by "TN".

Expected output

TN09XY5678
TN09xy5678

Need a hint?

.upper() returns an all-caps copy and .replace("tn", "TN") swaps only the matched part.

Show the solution

s03_workshop03_sol_string_methods.py

plate = "tn09xy5678"
# Problem-03 Task-1: print the plate in upper case
print(plate.upper())

# Problem-03 Task-2: print plate with "tn" replaced by "TN"
print(plate.replace("tn", "TN"))

View the full solution file on GitHub

Problem-2: Plate Digits.

Write a program that prints whether "5678" is all digits and whether "tn09" is all digits.

Expected output

True
False

Need a hint?

.isdigit() is True only when every character is a digit, so "tn09" is False.

Show the solution

s03_workshop03_sol_string_methods.py

print("5678".isdigit())
print("tn09".isdigit())

View the full solution file on GitHub

Pages for this step: Concept | Practice | Workshop

Python Files for this step: Concept | Practice | Practice Solutions | Workshop | Workshop Solutions

Step-04: Indexing and Slicing¶

Concepts: slicing.

Write a program that, for a car code "Civic2022LX", using slices:

Task-1: print the model (Civic, the first 5 letters).
Task-2: print the year (2022, the four characters in the middle).
Task-3: print the trim (LX, the rest at the end).

Expected output

Civic
2022
LX

Need a hint?

code[:5] slices the first five (the model); code[5:9] slices the middle four (the year); code[9:] takes the rest (the trim).

Show the solution

s03_workshop04_sol_indexing_slicing.py

code = "Civic2022LX"
# Task-1: print the model (first 5 letters)
print(code[:5])   # Civic (the model)
# Task-2: print the year (four middle characters)
print(code[5:9])  # 2022 (the year)
# Task-3: print the trim (the rest at the end)
print(code[9:])   # LX (the trim)

View the full solution file on GitHub

Pages for this step: Concept | Practice | Workshop

Python Files for this step: Concept | Practice | Practice Solutions | Workshop | Workshop Solutions

Finished this section?

Check your work against the solutions above, then head back to the Section 03 lesson, or try the Section 03 practice for more reps.

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