Python Interview Questions
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Python - Data Types
1. What is the type of the following: 1
A) float
B) int
C) str
Answer: int
Explanation: As there is no decimal, the number is of type int
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2. What is the type of the following "7.1"
A) float
B) int
C) str
Answer: str
Explanation: The type is string
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3. What is the result of the following code segment: int(12.3)
A) 12.3
B) 12
C) 13
Answer: 12
Explanation: In Python, if you cast a float to an integer, the conversion truncates towards zero.
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4. What is the result of the following code segment: int(True)
A) 1
B) 0
C) error
Answer: 1
Explanation: When you cast a boolean True to an integer you get a 1
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5. What do you call a value that doesn’t have decimal values?
A) A number
B) An integer
C) A string
Answer: An integer
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6. What do you call a value that does have decimal values?
A) A float
B) A number
C) An integer
Answer: A float
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7. What data type can only have either a value of True or False?
A) A string
B) A boolean
C) An integer
Answer: A boolean
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8. What code would turn the string “1” into an integer?
A)str(1)
B) int("1")
C) float("1")
Answer: int("1")
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9. What character begins a single line comment?
A)'''
B) //
C) #
Answer:#
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10. What do we call it when we convert from one data type to another?
A)casting
B) converting
C) changing
Answer:casting
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11. What is the datatype of np.nan?
A) int
B) float
C) str
D) None
Answer: float
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12. Which of the following numbers is NOT a float?
A) 1.5
B) 2.333333
C) 0.0
D) 0
Answer: 0
Explanation:0 on its own is an int. 0.0 however, is a float.
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13. What values can the Boolean data type hold?
A) Integers, fractions, complex numbers
B) Unicode characters
C) True or False values
D) Any other data type
Answer: True or False values
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14. WWhat does it mean that Python is a dynamically-typed language?
A) Variables in python can implicitly change to other types when comparing. For examples you can compare a string "2" and the number 2 using ==.
B) Python variables can be assigned to different types and changes types at will.
C) Python is a more efficient language than C++
D) All of the above
Answer: Python variables can be assigned to different types and changes types at will.
Explanation: Dynamic-typing just refers to the ability for variables to flexibly learn their types during assignment.
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