pyPython Practice LabFrom first print to final round
TOPIC 08 OF 18

Sets and Dictionaries Python practice problems

Uniqueness, membership tests, key-value lookup, frequency counting, and grouping.

20 exercises8+ conceptsBeginner → interview context
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WHAT YOU WILL PRACTISE

Core concepts

Calculate set union and intersectionCount unique wordsBuild a word-frequency tableCalculate a student's averageUpdate inventoryGroup anagramsInvert a dictionaryFind the top k frequent values
REUSABLE THINKING

Problem-solving patterns

  • set operators · sorting
  • set · normalization
  • Counter · dictionary
  • nested data · average
  • state update · business rule
PRACTICE OUTCOME

What this topic builds

Learn the idea once, use it across the exercises, and explain why your approach works.

ORDERED PRACTICE

All 20 problems in this topic

Work from top to bottom to build the concept gradually.

  1. #113
    Calculate set union and intersection: Shared course IDs

    Compare course IDs selected by two students.

    StarterPremium
  2. #114
    Calculate set union and intersection: Disjoint choices

    Handle two groups with no values in common.

    StarterPremium
  3. #115
    Count unique words: Repeated topic words

    Count distinct words in a short, case-insensitive note.

    StarterPremium
  4. #116
    Count unique words: All repeated

    Return one when the same word appears with different capitalization.

    StarterPremium
  5. #117
    Build a word-frequency table: Analyze feedback

    Count every word in a short feedback line.

    BeginnerPremium
  6. #118
    Build a word-frequency table: Single vocabulary item

    Count a line containing just one repeated word.

    BeginnerPremium
  7. #119
    Calculate a student's average: Three assessments

    Create a small record and report a learner's average.

    BeginnerPremium
  8. #120
    Calculate a student's average: Decimal results

    Support assessment scores with decimal values.

    BeginnerPremium
  9. #121
    Update inventory: Deliveries and sales

    Apply a sequence of deliveries and sales to current stock.

    BeginnerPremium
  10. #122
    Update inventory: Prevent negative stock

    Clamp stock at zero if an outgoing request exceeds availability.

    BeginnerPremium
  11. #123
    Group anagrams: Several word families

    Group words that contain the same letters.

    BeginnerPremium
  12. #124
    Group anagrams: No matches

    Produce one single-word group for each unrelated word.

    IntermediatePremium
  13. #125
    Invert a dictionary: Code lookup

    Reverse a name-to-code mapping so codes become searchable keys.

    IntermediatePremium
  14. #126
    Invert a dictionary: Numeric-looking values

    Invert text pairs whose values happen to contain digits.

    IntermediatePremium
  15. #127
    Find the top k frequent values: Top two product codes

    Find the two most frequent product codes.

    IntermediatePremium
  16. #128
    Find the top k frequent values: Frequency tie

    Break equal-frequency ties by choosing smaller values first.

    IntermediatePremium
  17. #129
    Merge numeric dictionaries: Combine branch sales

    Add sales totals from two branches by product key.

    IntermediatePremium
  18. #130
    Merge numeric dictionaries: No shared keys

    Merge mappings whose keys do not overlap.

    AdvancedPremium
  19. #131
    Build an adjacency list: Small network

    Convert a small undirected network into neighbor lists.

    AdvancedPremium
  20. #132
    Build an adjacency list: Include an isolated vertex

    Show an empty adjacency list for a vertex with no edges.

    AdvancedPremium