print (1)
print ('asdfghj')

输出结果
1
asdfghj

x = 1
y = 2
def add (x, y):
    z = x + y
print (add(x,y))

输出结果
None

def func1():
    for i in range(1, 5):
        print (i)

def func2():
    for i in range(1, 5):
        return (i)

func1()

print ("..............")
print (func2())

输出结果
1
2
3
4
..............
1