Chapter 2 Operators, Truthy and Falsy Values

• Operators: constructs that can manipulate the value of operands ex: 4+5=9, 4&5 ⇒ operands, + ⇒ operator

Types of operators

1. Arithmetic operators: + - * / % ** (return a number)
2. Assignment operators: =, +=, -=, *=, /=, **=

• <Code>

1. Membership operators

• <Code>

1. Comparison operators: ==, !=, >, <, >=, <= (return a boolean value)

• <Code>

1. Logical operators (return a boolean value)

• <Code>

1. Bitwise operators

• <Code>

1. Identity operators: 少用到(不講)

Truthy and Falsy Values in Python

• In a Boolean context, almost all Python objects can be evaluated to be either True or False. ⇒ logical operator: 3 and 9, 3 is not a boolean, but it is applied in a boolean context. Thus, 3 will be evaluated to be either True or False.
• condition if(…) then ⇒ boolean context
• 被當成True的object : Truthy values / 被當成False的object: Falsy values (只需要記得Falsy objects)