Data Types and Variables

Familiarizing yourself with data types (integers, floats, strings, booleans) and how to declare and use variables.Here are 25 questions focusing on Python data types and variables, along with an examp

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1

What are the basic data types available in Python?

• Example:

  int_type = 10  # Integer
  float_type = 10.5  # Float
  str_type = "Hello"  # String
  bool_type = True  # Boolean

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2

How do you create an integer variable in Python?

• Example:

  age = 25
  print(age)  # Output: 25

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3

How do you create a floating-point variable in Python?

• Example:

  temperature = 98.6
  print(temperature)  # Output: 98.6

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4

How do you create a string variable in Python?

• Example:

  message = "Hello, World!"
  print(message)  # Output: Hello, World!

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5

How do you create a boolean variable in Python?

• Example:

  is_active = True
  print(is_active)  # Output: True

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6

How do you concatenate two strings in Python?

• Example:

  first_name = "John"
  last_name = "Doe"
  full_name = first_name + " " + last_name
  print(full_name)  # Output: John Doe

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7

How do you convert a string to an integer?

• Example:

  number_str = "123"
  number_int = int(number_str)
  print(number_int)  # Output: 123

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8

How do you convert an integer to a string?

• Example:

  number_int = 456
  number_str = str(number_int)
  print(number_str)  # Output: "456"

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9

How do you check the type of a variable in Python?

• Example:

  variable = 42
  print(type(variable))  # Output: <class 'int'>

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10

What will be the output of the following code?

x = 5
y = 2.5
z = x + y
print(z)  # Output: 7.5

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11

How do you create a list in Python?

• Example:

  fruits = ["apple", "banana", "cherry"]
  print(fruits)  # Output: ["apple", "banana", "cherry"]

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12

How do you access the first element of a list?

• Example:

  numbers = [10, 20, 30]
  print(numbers[0])  # Output: 10

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13

How do you create a tuple in Python?

• Example:

  coordinates = (10, 20)
  print(coordinates)  # Output: (10, 20)

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14

How do you create a set in Python?

• Example:

  unique_numbers = {1, 2, 3, 3, 4}
  print(unique_numbers)  # Output: {1, 2, 3, 4}

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15

How do you create a dictionary in Python?

• Example:

  person = {"name": "Alice", "age": 30}
  print(person)  # Output: {"name": "Alice", "age": 30}

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16

How do you access a value in a dictionary using a key?

• Example:

  person = {"name": "Alice", "age": 30}
  print(person["name"])  # Output: Alice

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17

How do you add a new key-value pair to a dictionary?

• Example:

  person = {"name": "Alice", "age": 30}
  person["city"] = "New York"
  print(person)  # Output: {"name": "Alice", "age": 30, "city": "New York"}

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18

How do you remove a key-value pair from a dictionary?

• Example:

  person = {"name": "Alice", "age": 30, "city": "New York"}
  del person["city"]
  print(person)  # Output: {"name": "Alice", "age": 30}

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19

What is the difference between a list and a tuple?

• Example:

  my_list = [1, 2, 3]
  my_tuple = (1, 2, 3)
  my_list[0] = 10  # Lists are mutable
  # my_tuple[0] = 10  # This would raise an error because tuples are immutable

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20

How do you check if an element exists in a list?

• Example:

  fruits = ["apple", "banana", "cherry"]
  print("banana" in fruits)  # Output: True

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21

How do you get the length of a list?

• Example:

  numbers = [1, 2, 3, 4, 5]
  print(len(numbers))  # Output: 5

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22

How do you convert a list to a tuple?

• Example:

  my_list = [1, 2, 3]
  my_tuple = tuple(my_list)
  print(my_tuple)  # Output: (1, 2, 3)

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23

How do you create a set from a list?

• Example:

  my_list = [1, 2, 2, 3, 4]
  my_set = set(my_list)
  print(my_set)  # Output: {1, 2, 3, 4}

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24

How do you check the data type of a variable in Python?

• Example:

  x = 3.14
  print(type(x))  # Output: <class 'float'>

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25

How do you use type casting to change a variable from one type to another?

• Example:

  value = "100"
  int_value = int(value)  # Cast string to integer
  print(int_value)  # Output: 100

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