按位 AND

Created: November-22, 2018

& 運算子將執行二進位制 AND ，如果兩個運算元中都存在一個位，則複製該位。這意味著：

# 0 & 0 = 0
# 0 & 1 = 0
# 1 & 0 = 0
# 1 & 1 = 1

# 60 = 0b111100
# 30 = 0b011110
60 & 30
# Out: 28
# 28 = 0b11100

bin(60 & 30)
# Out: 0b11100