2020-01-16 for and while loop

while loop

#while 布林值:
    #若布林值为true，执行命令
    #回到上方，做下一个的循环判断

n = 1
sum = 0
while n <=10:
    print("n =",n)
    sum = sum +n
    n+=1
print(sum)

for loop

#for 变量 in 列表或者字符串:
    #列表或者字符中的变量逐一取出，逐一处理

for x in [4,1,2]:
    print(x)

for c in "hello":
    print(c)

#range() 连续数字的列表

#range(3) = [0,1,2]
#range(5) = [0,1,2,3,4]
#range(3,6)= [3,4,5]
# for x in range(4):
    #print(x)

sum = 0
for x in range(11):
    sum = sum+x
print(sum)