4.1.1

Identifiers

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Identifiers

Identifiers are the names given to variables, constants, and subroutines.

Variables

Variables

  • Variables should have lowercase names, with each word separated by an underscore. For example:
    • this_is_my_variable
    • user_money
  • Variable should also have descriptive names, for example user_money is much better than this_is_my_variable.
Constants

Constants

  • Constants should be named using the same rules as variables, but uppercase.
Subroutines

Subroutines

  • Subroutines should have lowercase names, with each word separated by an underscore. For example:
    • calculate_sum()
    • get_user_id()
  • Subroutines should have descriptive names where possible.
Global rules

Global rules

  • In general, all identifiers should be descriptive.
  • Characters which might be confused should be avoided, for example:
    • 0 and O.
    • 1 and l (lower case L).
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1

Introduction to Python

1.1

Python

1.1.1Python
1.2

Input & Output

1.2.1Input & Output
1.3

Data Types

1.3.1Data Types
1.4

Variables & Constants

1.4.1Variables & Constants
1.5

Operators

1.5.1Arithmetic & Relational Operators1.5.2Boolean & Assignment Operators 2
1.6

Program Flow

1.6.1Selection1.6.2Iteration
2

Data Structures

2.1

Lists & Strings

2.1.1Lists2.1.2Strings
2.2

File Handling

2.2.1File Handling
3

Modularity

3.1

Subroutines

3.1.1Subroutines
3.2

Data Flow

3.2.1Data Flow
4

Good Practice

4.1

Naming & Whitespace

4.1.1Identifiers4.1.2Whitespace
4.2

Comments

4.2.1Comments
4.3

Exceptions

4.3.1Exceptions

Practice questions on Identifiers

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  1. 1
    Which character should separate each word in variable and constant identifiers?Multiple choice
  2. 2
    Which of the following are suitable names for constants?True / false
  3. 3
    Subroutines follow the same naming rules as:Multiple choice
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Data Flow

Whitespace