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PCEP-30-02 Practice Test Compendium
  • Introduction
  • Part 1 | About PCEP-30-02
    • About this guide
      • PCEP-30-02 – Practice Test Compendium
      • PCEP-30-02 Practice Test Compendium – Structure
    • PCEP-30-02: Exam specs, exam policies, delivery channels, and FAQs
      • Section 1: About PCEP-30-02
      • PCEP-30-02 Practice Test Compendium – Exam Specs
      • PCEP-30-02 Practice Test Compendium – Exam Policies
      • PCEP-30-02 Practice Test Compendium – FAQs
  • Part 2 | Study Pages & Exam Section Questions
    • Exam Block #1: Computer Programming and Python Fundamentals
      • Module 01
        • 1.1.1 PCEP-30-02 Practice Test Compendium – Exam Block #1
          • PCEP-30-02 Practice Test Compendium – Exam Block #1
        • 1.2.1 Pcep-30-02 Practice Test Compendium – Fundamental Concepts
          • 1.2.1.1 PCEP-30-02 Practice Test Compendium – Fundamental Concepts
          • 1.2.1.2 PCEP Practice Test Compendium – Python basic types and literals
          • 1.2.1.3 PCEP Practice Test Compendium – Python basic types and literals
          • 1.2.1.4 PCEP-30-02 Practice Test Compendium – Operators
          • 1.2.1.5 PCEP-30-02 Practice Test Compendium – Operators
          • 1.2.1.6 PCEP-30-02 Practice Test Compendium – Variables, assignments, comments
          • 1.2.1.7 PCEP-30-02 Practice Test Compendium – Variables, assignments, comments
          • 1.2.1.8 PCEP-30-02 Practice Test Compendium – Basic Input/Output
      • Module 02
        • 2.1.1 Exam block #1 Practice Questions – Computer Programming and Python Fundamentals
          • Exam Block #1 Practice Questions: Computer Programming and Python Fundamentals
    • Exam Block #2: Control Flow – Conditional Blocks and Loops
      • Module 01
        • 1.1.1 PCEP-30-02 Practice Test Compendium - Exam Block #2
          • PCEP-30-02 Practice Test Compendium – Exam Block #2
          • PCEP-30-02 Practice Test Compendium – Conditional statements
          • PCEP-30-02 Practice Test Compendium – Loops
      • Module 02
        • 2.1.1 Exam Block #2 Practice Questions: Control Flow - Conditional Blocks and Loops
          • Exam Block #2 Practice Questions: Control Flow - Conditional Blocks and Loops
    • Exam Block #3: Data Collections – Tuples, Dictionaries, Lists, and Strings
      • Module 01
        • 1.1.1 PCEP-30-02 Practice Test Compendium – Exam Block #3
          • 1.1.1.0 PCEP-30-02 Practice Test Compendium – Exam Block #3
          • 1.1.1.1 PCEP-30-02 Practice Test Compendium – Exam Block #3
        • 1.2.1 PCEP-30-02 Practice Test Compendium – Lists and Strings
          • 1.2.1.1 PCEP-30-02 Practice Test Compendium – Lists and strings
          • 1.2.1.2 PCEP-30-02 Practice Test Compendium – Lists and strings
          • 1.2.1.3 PCEP-30-02 Practice Test Compendium – Tuples and dictionaries
          • 1.2.1.4 PCEP-30-02 Practice Test Compendium – Tuples and dictionaries
      • Module 02
        • 2.1.1 Exam Block 3 Practice Questions Data Collections - Tuples, Dictionaries, Lists, and Strings
          • Exam Block 3 Practice Questions: Data Collections - Tuples, Dictionaries, Lists, and Strings
    • Exam Block #4: Functions and Exceptions
      • Module 01
        • 1.1.1 PCEP-30-02 Practice Test Compendium – Exam Block #4
          • 1.1.1.0 PCEP-30-02 Practice Test Compendium – Exam Block #4
          • 1.1.1.1 PCEP-30-02 Practice Test Compendium – Exam Block #4
          • 1.2.1.1 PCEP-30-02 Practice Test Compendium – Functions
          • 1.2.1.2 PCEP-30-02 Practice Test Compendium – Functions
          • 1.2.1.3 PCEP-30-02 Practice Test Compendium – Exceptions and debugging
      • Module 02
        • 2.1.1 Exam Block 4 Practice Questions Functions and Exceptions
          • Exam Block 4 Practice Questions: Functions and Exceptions
    • PRACTICE TEST
      • PCEP-30-02 - Practice Test (Exam Blocks 1-4)
  • Part 3 | Final Practice Test
    • FINAL PRACTICE TEST
      • Final Practice Test
  • Appendix 01: Solutions to Practice Questions (Exam Blocks 01-04)
  • Appendix 02: Solutions to PCEP-30-02 - Practice Test (Exam Blocks 1-4)
  • Appendix 03: Solutions to Final Practice Test
  • Appendix 04: Modifications
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On this page
  • Variables
  • The assignment operator
  1. Part 2 | Study Pages & Exam Section Questions
  2. Exam Block #1: Computer Programming and Python Fundamentals
  3. Module 01
  4. 1.2.1 Pcep-30-02 Practice Test Compendium – Fundamental Concepts

1.2.1.6 PCEP-30-02 Practice Test Compendium – Variables, assignments, comments

Previous1.2.1.5 PCEP-30-02 Practice Test Compendium – OperatorsNext1.2.1.7 PCEP-30-02 Practice Test Compendium – Variables, assignments, comments

Last updated 2 years ago

Variables

01) A variable is a named container able to store data.

02) A variable's name can consist of:

  • letters (including non-Latin ones)

  • digits

  • underscores (_)

and must start with a letter (note: underscores count as letters). Upper- and lower-case letters are treated as different.

03) Variable names which start with underscores play a specific role in Python – don't use them unless you know what you're doing.

04) Variable names are not limited in length.

05) The name of the variable must not be any of Python's keywords (also known as reserved words). The complete list of Python 3.8 keywords looks as follows:

'False', 'None', 'True', 'and', 'as', 'assert', 'async', 'await', 'break', 'class', 'continue', 'def', 'del', 'elif', 'else', 'except', 'finally', 'for', 'from', 'global', 'if', 'import', 'in', 'is', 'lambda', 'nonlocal', 'not', 'or', 'pass', 'raise', 'return', 'try', 'while', 'with', 'yield'

* Note: Python 3.9 introduced a new keyword, __peg_parser__, which is an easter egg related to the rollout of a new PEG parser for CPython. You can read more about this in . The keyword will most probably be removed in Python 3.10.

06) These are some legal, but not necessarily the best, Python variable names:

  • i

  • counter_2

  • _

  • Tax22

The assignment operator

07) The assignment operator = is designed to assign a value to a variable:

variable = expression

For example:

counter = 0
pi2 = 3.1415 ** 2

or – when more than one variable is assigned with the same value:

variable_1 = variable_2 = ... = expression

For example:

counter = stages = 0

08) A variable must be assigned (defined) before its first use – using a variable without prior definition (assignment) raises the NameError exception.

09) Python is a dynamically typed language, which means that a variable can freely change its type according to the last assignment it took part in.

10) There are some short-cut (compound) operators which simplify certain kinds of assignments.

PEP 617