def square(x):
        squared=x*x
        return squared

print(square(2))

#输出结果为4

square= lambda x:x*xprint(square(2))

#输出结果为 4

filter(lambda x: x>2, range(1,5))

#输出为[3,4]

map(lambda x: x*x, range(1,3))

#输出为[1,4]

reduce(lambda x,y: x+y, range(1,5))

#输出为10