🧪 Practice: Spot the Tokens

🧪 Practice: Spot the Tokens

Module 2 gave you the atoms: keywords, identifiers, literals, operators, delimiters — plus comments, docstrings, and the indentation rule. Time to prove it. Attempt everything before peeking at the solutions.

Exercise 1 — Token autopsy

List every token in this line, and name each one’s family:

total = price + 50

Exercise 2 — Legal or illegal?

Mark each identifier as legal or illegal. If illegal, say why:

1. my_score
2. 2nd_player
3. for
4. For
5. user-name
6. _temp
7. class
8. Class2

Exercise 3 — Keyword or identifier?

True, true, while, While, none, None, is, is_not

Which are keywords?

Exercise 4 — Comment or docstring?

Which of these does Python store for help() to display?

# A: keeps the app alive
""" B: Keeps the app alive """

def keep_alive():
    # C: keeps the app alive
    """ D: Keeps the app alive """
    pass

Exercise 5 — The indentation detective

This code has three indentation problems. Find and fix them:

score = 75
if score >= 50:
print("Passed!")
  print("Well done")
else:
print("Failed")

Exercise 6 — Predict the output

Before running, write down what this prints:

# count = 10
count = 5
print(count)

Solutions

Exercise 1: total (identifier) = (operator) price (identifier) + (operator) 50 (literal).

Exercise 2:

1. my_score ✅
2. 2nd_player ❌ starts with a digit
3. for ❌ keyword
4. For ✅ — case-sensitive, For ≠ for
5. user-name ❌ hyphen reads as minus
6. _temp ✅ underscore is legal (and means “internal use” by convention)
7. class ❌ keyword
8. Class2 ✅ — contains the keyword but isn’t one

Exercise 3: True, while, None, is are keywords. true, While, none, is_not are identifiers — keywords are case-sensitive.

Exercise 4: Only D — a docstring placed first inside the function is stored and shown by help(). A is a comment, B is a floating string at module level (stored as __doc__ of the module, but the classic answer: D is the function’s docstring), C is a comment.

Exercise 5:

score = 75
if score >= 50:
    print("Passed!")
    print("Well done")
else:
    print("Failed")

Problems were: (1) print("Passed!") needed indenting under the if, (2) print("Well done") was indented 2 spaces — must match the block’s 4, (3) print("Failed") needed indenting under the else.

Exercise 6: It prints 5. The first line is a comment — Python never saw it. Comments are for humans; only real code runs.

✅ Checkpoint

Six exercises done from your own keyboard? Module 2 complete. You now speak Python’s alphabet: tokens, names, comments, and indentation.

Next module: Variables & Data Types — where your programs finally start remembering things.