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🚧 Debugging Practice – Python Data Structures

This document contains structured problems to enhance your problem-solving skills using Python's core data structures. Each problem demonstrates common beginner-level mistakes related to Lists, Tuples, Dictionaries, Sets, and Mixed Types.

🔢 1. List Debugging: Index Errors & Operations

🧬 Problem:

You're trying to access an index that doesn’t exist and modify a list item.

fruits = ["apple", "banana", "orange"]
fruits.append("grape")
fruits[3] = "melon"
print(fruits[4])

🧠 What to Learn:

  • How append() affects indexing
  • What happens when accessing out-of-range indexes
  • Proper way to replace an item

🖇️ 2. Tuple Debugging: Immutability

🧬 Problem:

Trying to modify a tuple, which is not allowed.

student_info = ("John", 16, "Grade 10")
student_info[1] = 17
print("Updated Age:", student_info[1])

🧠 What to Learn:

  • Tuples are immutable
  • How to work with tuples if you need changes (hint: convert to list)

🔑 3. Dictionary Debugging: Key Errors & Incorrect Add Method

🧬 Problem:

Accessing a non-existent key and misusing append() on a dictionary.

grades = {"Alice": 85, "Bob": 92}
print("Charlie’s grade is", grades["Charlie"])
grades["Alice"] = 88
grades.append("Eve": 90)

🧠 What to Learn:

  • How to handle missing keys safely (get() or in)
  • Adding new entries properly (grades["Eve"] = 90)

🎨 4. Set Debugging: No Indexing & Hashable Elements

🧬 Problem:

Trying to access sets using index and adding unhashable elements.

colors = {"red", "blue", "green"}
colors[1] = "yellow"
colors.add(["black", "white"])
print(colors)

🧠 What to Learn:

  • Sets do not support indexing
  • Only hashable (immutable) types can be added (e.g., strings, tuples)

🔁 5. Mixed Debugging: Type-Specific Operations

🧬 Problem:

Applying a list method to a set and accessing keys that don’t exist.

students = ["Alice", "Bob", "Charlie"]
ages = {"Alice": 15, "Bob": 16}
unique_names = set(students)
unique_names.add("Alice")
students.add("Daniel")
print(ages["Charlie"])

🧠 What to Learn:

  • .add() doesn't work on lists, use .append()
  • KeyError when accessing missing dictionary keys

📚 Next Steps: Try fixing each bug and re-run the corrected code. Make sure you understand:

  • Data type behavior
  • Safe data access
  • Proper method usage

✅ Day 5 – Python Debugging Tasks

🔧 TASK 1: List Debugging – Index Errors & Operations

❓ Problem:

fruits = ["apple", "banana", "orange"]
fruits.append("grape")
fruits[3] = "melon"
print(fruits[4])

🛠️ Bug Description:

  • fruits[3] = "melon" is fine as it replaces "grape".
  • But print(fruits[4]) throws IndexError since there's no 5th element.

✅ Corrected:

fruits = ["apple", "banana", "orange"]
fruits.append("grape")
fruits[3] = "melon"
print(fruits)

🔧 TASK 2: Tuple Debugging – Immutability

❓ Problem:

student_info = ("John", 16, "Grade 10")
student_info[1] = 17
print("Updated Age:", student_info[1])

🛠️ Bug Description:

  • Tuples are immutable. You can't change student_info[1].

✅ Corrected:

student_info = ("John", 17, "Grade 10")
print("Updated Age:", student_info[1])

🔧 TASK 3: Dictionary Debugging – Key Errors & Adding Elements

❓ Problem:

grades = {"Alice": 85, "Bob": 92}
print("Charlie’s grade is", grades["Charlie"])
grades["Alice"] = 88
grades.append("Eve": 90)

🛠️ Bug Description:

  • grades["Charlie"] raises KeyError.
  • .append() doesn't work with dictionaries.

✅ Corrected:

grades = {"Alice": 85, "Bob": 92}
print("Charlie’s grade is", grades.get("Charlie", "Not Found"))
grades["Alice"] = 88
grades["Eve"] = 90

🔧 TASK 4: Set Debugging – No Indexing & Hashable Elements

❓ Problem:

colors = {"red", "blue", "green"}
colors[1] = "yellow"
colors.add(["black", "white"])
print(colors)

🛠️ Bug Description:

  • Sets don't support indexing like colors[1].
  • .add() can only take hashable (immutable) items, not a list.

✅ Corrected:

colors = {"red", "blue", "green"}
colors.add("yellow")
colors.update(["black", "white"])
print(colors)

🔧 TASK 5: Mixed Debugging – Type-Specific Operations

❓ Problem:

students = ["Alice", "Bob", "Charlie"]
ages = {"Alice": 15, "Bob": 16}
unique_names = set(students)
unique_names.add("Alice")
students.add("Daniel")
print(ages["Charlie"])

🛠️ Bug Description:

  • students is a list; you can't use .add(), use .append() instead.
  • ages["Charlie"] causes KeyError.

✅ Corrected:

students = ["Alice", "Bob", "Charlie"]
ages = {"Alice": 15, "Bob": 16}
unique_names = set(students)
unique_names.add("Alice")
students.append("Daniel")
print(ages.get("Charlie", "Not Found"))