python学习笔记，视频day19-习题

1、bool值为false

 0、false、‘’、()、[]、{} 、None

2、根据范围获取其中3和7整除的所有数的和

 

def func(start,end,a=0,b=0):
    if start==end:
        return a,b
    if(start%3==0 and start%7==0):
        a+=1
        b+=start
    ret=func(start+1,end,a,b)
    return ret
ret=func(30,70)
print(ret)
# (2, 105)

 

def func(x,z,y):
    print(x,y,z)
func(1,3,2)
# 1 2 3

def func(x,z,y=5):
    print(x,y,z)
func(1,3,2)
# 1 2 3

def func(x,*z,**y):
    print(x,y,z)
func(1,3,2)
# 1 {} (3, 2)

def func(*y,**z):
    print(y,z)
func([1,2,3,4],{"name":"alex","age":19})
# ([1, 2, 3, 4], {'name': 'alex', 'age': 19}) {}

def func(*y,**z):
    print(y,z)
func(*[1,2,3,4],{"name":"alex","age":19})
# (1, 2, 3, 4, {'name': 'alex', 'age': 19}) {}

 

 

 

 

 

def f1(arg):
    print(arg+100)
def f2(arg):
    ret=f1(arg+1)
    print(arg)
    print(ret)
ret=f2(7)
print(ret)
# 108
# 7
# None
# None

def f1(arg):
    print(arg+100)
    return 100
def f2(arg):
    ret=f1(arg+1)
    print(arg)
    print(ret)
    return 200
ret=f2(7)
print(ret)
# 108
# 7
# 100
# 200

def func(n):
    if n==1:
        return 1
    return n*func(n-1)
f=func(3)
print(f)