python 操作符 or Operator 的傳回值

or operater

1. BOOLEAN：

x	y	x or y
True	True	True
True	False	True
False	True	True
False	False	False

True or True => True
False or True => True
True or False => True
False or False => False
           

x	y	x or y
x	y	x, if x is true, otherwise y

隻看or左側的，如果非空，則傳回左側數值；若空，則直接傳回右側

會傳回False的Objects：

• constants defined to be false: None and False.
• zero of any numeric type: 0, 0.0, 0j, Decimal(0), Fraction(0, 1)
• empty sequences and collections: ‘’, (), [], {}, set(), range(0)

0 or 1 => 1
1 or 2 => 1
2 or 1 => 2
[] or 1 => 1
[] or 0 => 0
2 < 4 or [] => True
5 > 10 or [] => []
5 > 10 or 0 => 0
True or 4 < 3 => True
False or 0 < 3 => True