Day 7 - Dictionaries & Sets

Author: Zemerik

Day 7 - Dictionaries & Sets/README.md

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+# Day 7: Dictionaries & Sets
+
+## What You'll Learn:
+- Dictionary creation and key-value operations
+- Common dictionary methods (get(), keys(), items())
+- Set creation and mathematical operations
+- Unique element handling with sets
+
+## Files:
+1. `dictionary_basics.py` - Core dictionary operations
+2. `set_operations.py` - Set methods and math operations
+3. `nested_data.py` - Combining dictionaries and sets
+
+## Exercises:
+1. Create a user profile system that:
+   - Stores user info as dict (name, email, preferences)
+   - Allows updating preferences (add/remove items)
+   - Checks if mandatory fields exist
+
+2. Build a common interests finder that:
+   - Takes 2 sets of hobbies/interests
+   - Identifies shared interests
+   - Shows unique interests per person

Day 7 - Dictionaries & Sets/dictionary_basics.py

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+# Dictionary creation
+student = {
+    "name": "Alice",
+    "age": 20,
+    "courses": ["Math", "CS"]
+}
+
+# Accessing values
+print(student["name"])
+print(student.get("grade", "N/A"))  # Safe access
+
+# Modifying dict
+student["email"] = "[email protected]"
+del student["age"]
+
+# Dictionary methods
+print("Keys:", student.keys())
+print("Items:", student.items())

Day 7 - Dictionaries & Sets/nested_data.py

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+# Dictionary with set values
+movie_ratings = {
+    "action": {"John", "Mike", "Sarah"},
+    "comedy": {"Mike", "Emma"},
+    "drama": {"Sarah", "Emma"}
+}
+
+# Add new voter to genre
+movie_ratings["action"].add("Emma")
+
+# Find voters of multiple genres
+action_fans = movie_ratings["action"]
+drama_fans = movie_ratings["drama"]
+both_genres = action_fans & drama_fans
+
+print(f"Fans of both action and drama: {both_genres}")

Day 7 - Dictionaries & Sets/set_operations.py

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+# Set creation
+primes = {2, 3, 5, 7, 11}
+evens = {2, 4, 6, 8}
+
+# Set methods
+primes.add(13)
+primes.discard(2)
+
+# Mathematical operations
+print("Union:", primes | evens)
+print("Intersection:", primes & evens)
+print("Difference:", primes - evens)
+
+# Membership test
+print(7 in primes)  # True