Flow Control

Flow control statements can decide which Python instructions to execute under which conditions.

Boolean Values

Boolean data types only have two values: True and False. When typed as Python code, they should always start with upper case, and should not be inside quotes like what is done on strings. They can also be stored in variables.

Boolean Operators

Operators: and, or and not. They evaluate expressions down to a Boolean value. The and operator evaluates an expression to True if and only if both Boolean values are True.

The and Operator’s Truth Table
Expression	Evaluation Result
True and True	True
True and False	False
False and True	False
False and False	False

The or Operator’s Truth Table
Expression	Evaluation Result
True or True	True
True or False	True
False or True	True
False or False	False

The not Operator’s Truth Table (operates on only one Boolean Value)
Expression	Evaluation Result
not True	False
not False	True

Comparison Operators

Operators	Meaning
==	Equal To
!-	Not Equal To
<	Less Than
>	Greater Than
<=	Less Than or Equal To
>=	Greater Than or Equal To

Important points to remember with Comparison Operators

Integer or Floating-point value will always be unequal to a string value.
The <, >, <=, and >= operators only work properly with integer and floating point values.
== operator asks whether two values are the same as each other.
= operator puts the value on the right into the variable on the left (variable assignment).