Consider: d = {'a': 1, 'b': 2}; d['c'] = 3. What is d?

The correct answer is B: {'a': 1, 'b': 2, 'c': 3}. Dictionaries are mutable. The assignment d['c'] = 3 adds a new key-value pair to the dictionary. d becomes {'a': 1, 'b': 2, 'c': 3}.

What will be the type of x after executing: x = [1, 2.5, 'hello']?

The correct answer is A: list. Square brackets [] create a list object. Lists in Python can contain elements of different data types (heterogeneous).

What will be the output of: len('Python')?

The correct answer is B: 6. The string 'Python' has 6 characters: P, y, t, h, o, n. The len() function returns the number of characters.

What is the difference between list and tuple in Python?

The correct answer is A: Lists are mutable, tuples are immutable. Lists (created with []) can be modified after creation, while tuples (created with ()) cannot be changed after initialization.

What will be the output of: print(isinstance(5, int))?

The correct answer is A: True. isinstance() checks if an object is an instance of a class. 5 is an integer, so isinstance(5, int) returns True.

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Python Programming
Basics & Syntax

Python fundamentals to advanced for interviews

33 Q 2 Topics Take Mock Test

Difficulty: All Easy Medium Hard 31–33 of 33

Topics in Python Programming

All Basics & Syntax 100 Data Types & Lists 19

Q.31 Easy Basics & Syntax

What will be the output of: print(type(5.0))?

Correct Answer: B.

EXPLANATION

5.0 is a floating-point number in Python. The type() function returns <class 'float'> for decimal numbers.

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Q.32 Easy Basics & Syntax

Which of the following is NOT a valid Python identifier?

A _variable

B variable2

C 2variable

D var_name

Correct Answer: C. 2variable

EXPLANATION

Python identifiers cannot start with a digit. They must begin with a letter or underscore.

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Q.33 Easy Basics & Syntax

What is the correct way to create a variable in Python?

A variable_name = value

B $variable_name = value

C variable-name = value

D variable name = value

Correct Answer: A. variable_name = value

EXPLANATION

Python variables are created using the assignment operator (=) with valid identifiers containing letters, digits, and underscores.

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Python Programming Basics & Syntax

Python Programming
Basics & Syntax