Control Structures - Formula Sheet

Control Structures Syntactic Formulas

1. Simple If Block

Structure:

if <condition>:
    statements-block

Definitions:

• <condition>: A relational or logical comparison that yields a Boolean value.
• statements-block: Indented instructions that execute if the condition is True.

2. If-Else Alternative Selection

Structure:

if <condition>:
    statements-block1
else:
    statements-block2

Definitions:

• statements-block1: Executed when the condition evaluates to True.
• statements-block2: Executed when the condition evaluates to False.

3. Inline Ternary Conditional Assignment

Structure:

<variable> = <value1> if <condition> else <value2>

Definitions:

• <variable>: The target variable receiving the assignment.
• <value1>: Assigned to the variable if the condition is True.
• <condition>: The conditional Boolean expression.
• <value2>: Assigned to the variable if the condition is False.

4. Entry-Controlled While Loop

Structure:

while <condition>:
    statements-block1
[else:
    statements-block2]

Definitions:

• statements-block1: Repeatedly executed as long as the condition remains True.
• else: Optional block executed once when the loop condition evaluates to False.

5. Definite For Loop over a Sequence

Structure:

for counter_variable in sequence:
    statements-block1
[else:
    statements-block2]

Definitions:

• counter_variable: Temporary variable that holds the current item from the sequence on each pass.
• sequence: An ordered range, list, tuple, or string.

6. Range Function Parameters

Structure:

range(start, stop[, step])

Definitions:

• start: The starting integer of the sequence (inclusive). Defaults to 0.
• stop: The terminal limit of the sequence (exclusive). Values go up to stop - 1.
• step: The integer increment or decrement value. Defaults to 1.