Introduction to Python

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Questions and Answers

Which of the following describes Python's primary function?

  • A high-performance database management system.
  • A versatile, high-level programming language. (correct)
  • A dedicated hardware description language.
  • An advanced operating system kernel.

Which of the following is a valid variable name in Python?

  • _my_variable (correct)
  • my variable
  • my-variable
  • 2nd_variable

What data type does the value False belong to in Python?

  • String
  • Float
  • Integer
  • Boolean (correct)

Which operator is used to calculate the power of a number in Python (e.g., $x^y$)?

<p>** (B)</p>
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What will the expression type(3.14) return in Python?

<p><code>&lt;class 'float'&gt;</code> (B)</p>
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Which keyword is used to begin the definition of a new function in Python?

<p>def (C)</p>
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What will print(7 == '7') output in Python?

<p>False (D)</p>
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Which function would you use to convert the string '3.14' into a floating-point number?

<p>float() (B)</p>
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What will be the output of the len([10, 20, 30, 40, 50]) function call?

<p>5 (A)</p>
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What does the expression 17 // 5 evaluate to in Python?

<p>3 (C)</p>
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Flashcards

What is Python?

A high-level, versatile programming language known for its readability and wide range of applications.

What is a String?

A sequence of characters.

Valid variable name?

A valid variable name begins with a letter or underscore, followed by letters, numbers, or underscores.

What is a Boolean?

A data type representing logical values: True or False.

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Exponentiation operator

The ** operator is used for exponentiation (raising to a power).

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Function Definition Keyword

The def keyword is used to define a function.

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What does print(5 == '5') return?

False, because the equality operator == checks for value equality, but not type equality. 5 is an integer and '5' is a string, so they are not equal.

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String to Integer Conversion

The int() function converts a string into an integer.

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What will len([1, 2, 3, 4]) return?

It will return 4

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What does print(3 // 2) output?

It will output 1. The // operator performs integer division, discarding any fractional part.

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Study Notes

  • Python is a programming language.

Variables

  • _var is a valid variable name.

Data Types

  • True is a Boolean data type in Python.

Operators

  • ** is the operator used for exponentiation.
  • print(type(42)) outputs <class 'int'>.

Functions

  • def keyword defines a function

Conditionals

  • print(5 == '5') returns False.

Type Conversion

  • int() function converts a string into an integer.
  • len([1, 2, 3, 4]) returns 4.
  • print(3 // 2) outputs 1.

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