# 赋值运算符
a = 1
b = 2
c = 3
d = 4
e = 5
f = 6
g = 7
# 加法赋值运算符
# a += 1

# 减法、 乘法、除法赋值运算符
b -= a # b = b - a
print(b)
c *= 3
print(c)
d //= 1
print(d)

# 取模、幂赋值

sheet = ['张三']
if '张三' in sheet:
    print('他在上课')
else:
    print('他旷课了啊')
