v1 = "YoungCyan"
v2 = "LiLei"
temp = v1 and v2
#第一步 将and前后的值装换为布尔值， 这里是 True and True
#第二部 判断本次操作谁能最终确定整个表达式真假，就返回谁做表达式的值。这里影响这个表达式的真假值是v2
#所以temp == v2;
#or表达式的推理也是如此
print(temp)
v1 = "" #bool值为false
v2 = "YoungCyan"
temp = v1 and v2
print(temp + "<========== '空字符串'")
v1 = "" #bool值为false
v2 = "YoungCyan"
temp = v2 and v1
print(temp + "<========== '空字符串'")
print("==================================================")
print("or 表达式")
v1 = "" #bool值为false
v2 = "YoungCyan"
temp = v1 or v2
print(temp)
v1 = "" #bool值为false
v2 = "YoungCyan"
temp = v2 and v1
print(temp+"<======'空字符串'")
v1 = "" #bool值为false
v2 = 0
temp = v2 and v1
print(temp)