python作业（一）

a = 1
while a < 11:
	if a != 7:
		print(a)
	a += 1

a = 1
b = 0
while a < 101:
	b += a
	a += 1
print(b)

a = 1
while a < 100:
	print(a)
	a += 2

a = 2
while a < 101:
	print(a)
	a += 2

a = 1
b = 0
while a < 100:
	c = a % 2
	if c == 1:
		b += a 
	else:
		b -= a
	a += 1
print(b)

yname = "jinyu"
pd = "123456"
a = 1


while a < 4:
	inuname = input("请输入用户名")
	inpd = input("请输入密码")
	if a == 3:
		if inuname != yname or inpd != pd :
			print("错误次数太多，重新登陆")
			break 
	if inuname != yname:
		a += 1
		print("账户名错误，请重新输入")
		continue
	else :
		if inpd != pd :
			a += 1
			print("密码错误，请重新输入")
			continue
		else :
			print("登陆成功")
			break