Python Dictionary

1) Create & Print a Dictionary

Ask the user to enter a name and age, store them in a dictionary, and print it.

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2) Access a Value

Given:

student = {"name": "Alice", "age": 20}

Print the value of "name".

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3) Change a Value

Update the age in:

student = {"name": "Bob", "age": 18}

to a new age and print.

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4) Add a New Key-Value Pair

Start with:

info = {"city": "Toronto"}

Add "country": "Canada" and print.

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5) Remove a Key

Given:

info = {"name": "John", "age": 25, "city": "Delhi"}

Remove "age" and print.

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6) Get All Keys

Create a dictionary and print only its keys.

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7) Get All Values

Create a dictionary and print only its values.

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8) Loop Through Dictionary

Given a dictionary, loop through and print each key and its value.

Example output:

name : Alice
age : 20

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9) Check Membership

Ask the user for a key and check if it exists in the dictionary.

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10) Dictionary Length

Create a dictionary and print how many key-value pairs it has.

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11) Clear Dictionary

Create a dictionary, clear it using clear(), and print it.

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12) Copy Dictionary

Make a copy of a dictionary and print both original and copy.

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13) Nested Dictionary

Create a dictionary containing another dictionary inside it, then print both.

Example:

student = {
  "name": "Alice",
  "marks": {"math": 90, "science": 85}
}

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14) Update Dictionary

Use update() to add multiple key–value pairs at once.

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15) Pop an Element

Use pop() to remove a key and print the removed value.

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16) Default Value with get()

Try to access a key using get() that might not exist, and provide a default message.

Example:

dict.get("height", "Not found")

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17) Loop Keys Only

Loop through and print just the dictionary’s keys.

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18) Loop Values Only

Loop through and print just the dictionary’s values.

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19) Create Dictionary from Two Lists

Given:

keys = ["name", "age"]
values = ["Amy", 22]

Create a dictionary using a loop.

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20) Count Character Occurrences

Ask the user for a word. Create a dictionary where the keys are characters and values are the count of each character.

Example:

input: hello
result: {"h":1, "e":1, "l":2, "o":1}

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📝 Tips for Students

• Dictionaries are unordered collections of key–value pairs.

• Keys must be unique and hashable (e.g., strings, numbers, tuples).

• Common operations:

  • dict[key] — access value

  • dict[key] = value — add or update

  • .keys(), .values(), .items() — iterate

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