1.最簡單的流程控制control flow

• Equal to (==)

2 == 2 True >>> 2 == 5 False

• Not equal to (!=)

2 != 5 True >>> 2 != 2 False

• Less than (<)

2 < 5 True >>> 5 < 2 False

• Less than or equal to (<=)

2 <= 2 True >>> 5 <= 2 False

• Greater than (>)

5 > 2 True >>> 2 > 5 False

• Greater than or equal to (>=)

5 >= 5 True >>> 2 >= 5 False

2.布林值Boolean operators

布林值的運算符號有三種
• and
例如
1 < 2 and 2 < 3 is True;
1 < 2 and 2 > 3 is False.
• or
例如
1 < 2 or 2 > 3 is True;
1 > 2 or 2 > 3 is False.
• Not
例如
not 41 > 40 傳回 False.

資料來源：https://www.codecademy.com/courses/learn-python/lessons/conditionals--control-flow/exercises/to-be-andor-not-to-be?action=resume_content_item

布林值的運算並不是左至右，其固定順序是

1. not
2. and
3. or
   例如：True or not False and False回傳 True
   True or (not False) and False
   = True or True and False
   = True or (True and False)
   = True or False
   = True

3.Conditional Statement Syntax條件語句
例子1：

例子2:

if, else語句

elif
“else if”的簡寫
例子：