Module 2 - 1

Flow control

The order of statement execution

Linear: one statement after another

By default, execution of code is

Boolean/condition expressions

Selection or decision statements are based on

None and False

Zero of any Numeric types (0, 0.0, 0j, etc.)

Empty Sequences

What is always False with boolean expressions (3)

if

elif

else

switch

Types of Selection/Conditional statements (4)

if

Block of code executes if a boolean expression is true. If the boolean expression is false, the block of code is skipped

elif

Must come under if or an elif. It will execute its block of code if the boolean expression is true and if the if/elif it is attached to evaluates to False

else

Must come under an if or elif and only one can be present per if block. It will execute if the if and all precending elif (if present) evaluate to False

switch

Lets the value of a variable determine where the program will branch to

Logical NOT

Logical AND

Logical OR

Boolean expressions can also use the following logical operators (3)

Logical NOT (logical negation, logical complement)

A unary operator that operates one operand

Logical AND and OR

Binary operators that operate on two operands

Mathematical operators have higher precedence than the relational and logical operators

Relational operators have higher precedence than logical operators

Precedence rules with Logical operators in boolean expressions (2)

Necessary

In python, indentation is

Nested if

An if statement can be put inside another if statement where the second if will be evaluated only if the first if evaluates to true

match

Provides another way to decide which statement to execute next and uses a variable and attempts to match the value to one of several possible cases

Case

Contains a value and a list of statements

Default case

A match statement can have an optional case that uses an underscore. If this is present, control will transfer to the default case if no other case value matches

Falls through to the statement after the switch statement

If there is no default case, and no other value matches control…