py之循环，函数

循环

a=1
while a<10:
	print(a)
	a+=1

a=[123,1235,123124,1231]
while a:
	a1=a.pop()
	print(a1)

for a1 in a:
	print(a1)

for i in range(4):
	print(a[i])

for i in range(len(a)):
	print(a[i])

a=[1,2,3,4,5,6,7]
for i in a:
	if i%2==0:
		print(i)
	else:
		continue
		#break
	print(i)

函数

a=1
b=3

def printer():
	print(a)

printer()
def add_ad(a,b):
	print(a+b)

s=add_ad(1,3)
print(s)

def add_ad(a=1,b=3):
	print(a+b)

s=add_ad()
print(s)

s=add_ad(2,b=3)
print(s)

def add(a,*args):
	sum=0
	for i in args:
		sum+=i
	return sum

def add_2(a,**kwargs):
	for arg,val in kwargs.items():
		print(arg,val)

add(1,x=1,y=2)

#参数元组，*args代表自动识别参数的个数，实现变长参数的输入
#**kwargs接受的一个(str=any)的这样的一对值，变成字典保存下来

def add(a,*args):
	sum=0
	op=9
	for i in args:
		sum+=i
	return sum,op

d=add(1,2,4,5)
print(type(d))
print(d)
#for arg, val in dict.items():
#	print(arg, val)