递归，yield，参数槽

#1、
records = [('f',1,2,4),('k',3,4,5),('z','e','d')]

for key,value,*val in records:
#可迭代对象，解构
if key == 'f':

f(val)

print('val:{0},{1}'.format(*val))

print('key:{0},value:{1}'.format(key,value))

#2、参数槽
#以*分隔，{非命名参数，命名参数}
#不可使用可变位置参数
#可变关键字参数必须在命名参数之后
def func(a,b,c=3,*,f=5,k=3,j,**kw):

print(a)

print(b)

print(c)

print(f)

print(k)

print(j)

print(kw)

func(9,4,f=4,j=7,s=8)

9
4
3
4
3
7
{'s': 8}

#3、递归
lst = []
#十进制转换二进制
def to_binary(n):

r = n % 2

if n >= 2:

to_binary(n/2)

lst.append(int(r))

to_binary(10)

print(lst)

[1, 0, 1, 0]

#4、生成器（斐波那契数列）
def fib():
a,b = 0,1
while True:
a,b = b,a+b# 解包，封包
yield b

gen=fib()
def func(x):
for i in range(x):
print(next(gen))

5、斐波那契数列：
def fab(n):
#(1)
a = 1

b = 1

for i in range(n):

print(a)

a,b = b,a+b

def fab():
#(2)
a = 1

b = 1

while True:

yield a

a,b = b,a+b

gen = fab()
for i in range(10):

print(next(gen))

def fab(n):
#(3)
if n == 1 or n == 0:

return 1

return fab(n-1)+fab(n-2)