File I/O in Python
15 questions · 12 min · Medium
Dictionaries in Python
Test your knowledge of Python dictionaries, including creation, accessing values, updating items, dictionary methods, iteration, and nested dictionaries.
- 15
- Questions
- 12 min
- Time limit
- Medium
- Difficulty
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All 15 questions and answers Spoilers: this shows the questions and answers. Try the quiz first! Open
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1. Which data type is used to create a dictionary in Python?
- A. dict
- B. list
- C. tuple
- D. set
Show answer
A. dict
Python dictionaries are instances of the built-in dict type.
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2. Which brackets are used to define a dictionary literal in Python?
- A. []
- B. {}
- C. ()
- D. <>
Show answer
B. {}
Curly braces are used to create dictionary literals, such as {"name": "John"}.
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3. Which of the following correctly creates a dictionary?
- A. {"name": "Alice", "age": 25}
- B. ["name", "Alice", "age", 25]
- C. ("name", "Alice", "age", 25)
- D. {"name", "Alice", "age", 25}
Show answer
A. {"name": "Alice", "age": 25}
A dictionary contains key-value pairs separated by colons and separated from each other by commas.
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4. How do you access the value associated with the key "name" in a dictionary called person?
- A. person(name)
- B. person["name"]
- C. person->name
- D. person.name
Show answer
B. person["name"]
Dictionary values can be accessed using square brackets with the corresponding key.
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5. What happens when you access a dictionary using a key that does not exist with square brackets?
- A. It returns None
- B. It returns False
- C. It raises a KeyError
- D. It creates the key automatically
Show answer
C. It raises a KeyError
Accessing a missing key with dictionary[key] raises a KeyError.
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6. Which dictionary method can safely retrieve a value without raising a KeyError when the key is missing?
- A. find()
- B. get()
- C. fetch()
- D. read()
Show answer
B. get()
The get() method returns the value for a key and can return a default value if the key does not exist.
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7. Which statement adds or updates a key-value pair in a dictionary?
- A. person["age"] = 30
- B. person.add("age", 30)
- C. person.insert("age", 30)
- D. person.updateValue("age", 30)
Show answer
A. person["age"] = 30
Assigning a value to a key adds the key if it is new or updates the existing value if the key already exists.
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8. Which method returns all keys in a dictionary?
- A. keys()
- B. allKeys()
- C. keyList()
- D. getKeys()
Show answer
A. keys()
The keys() method returns a view containing the dictionary's keys.
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9. Which method returns all values in a dictionary?
- A. values()
- B. getValues()
- C. allValues()
- D. valueList()
Show answer
A. values()
The values() method returns a view containing the dictionary's values.
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10. Which dictionary method returns key-value pairs?
- A. pairs()
- B. items()
- C. entries()
- D. keyvalues()
Show answer
B. items()
The items() method returns a view of the dictionary's key-value pairs.
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11. Which method removes a specified key and returns its value?
- A. remove()
- B. delete()
- C. pop()
- D. discard()
Show answer
C. pop()
The pop() method removes the specified key and returns its associated value.
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12. Which method removes all items from a dictionary?
- A. empty()
- B. clear()
- C. removeAll()
- D. reset()
Show answer
B. clear()
The clear() method removes all key-value pairs from the dictionary.
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13. Which operator can be used to check whether a key exists in a dictionary?
- A. in
- B. contains
- C. exists
- D. has
Show answer
A. in
The in operator checks whether a specified key exists in a dictionary.
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14. What does the following code print? data = {"a": 1, "b": 2}; print(data["b"])
- A. 1
- B. 2
- C. b
- D. None
Show answer
B. 2
The key "b" is associated with the value 2, so data["b"] returns 2.
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15. Which statement about Python dictionaries is correct?
- A. Dictionary keys must be unique
- B. Dictionary values must be unique
- C. Dictionaries can only contain strings
- D. Dictionaries cannot contain nested dictionaries
Show answer
A. Dictionary keys must be unique
Each key in a dictionary is unique. Assigning a new value to an existing key replaces its previous value.