for，while循环嵌套

a=0
while a<3:
    j=0
    while j<3:
        print("*",end="")#行end取消默认换号
        j+=1
    print()#列
    a+=1
a=0
while a<4:
    b=0
    while b <= a:
        print("*",end="")
        b+=1
    print()
    a+=1


# 1到100所有偶数的和
i=0
sum1=0
while i<=100:
    if i%2==0:
        sum1+=i
    i+=1
print(sum1)

# for 变量 in 集合
#     语句
# i =0
# while i<5:
#     print(i)
#     i+=1;

list=[0,1,2,3,4]
for i in list:
    print(i)


for i in "abfasf":
    print(i)
#range()函数列表生成器


lis1 = range(5)
print(lis1)
print(lis1[0])

for i in range(5):
    print(i)


print("****************")
for i in range(3,5,10):
    print(i)

for i in range(5,10):
    print(i)

print("*-*-*-*-*-*-*-*-*-*-*-*")
for i in range(1,10):
    for j in range(1,10):
        print(i*j,"   ",end="")
    print()
    # for j in range(1,10):
    #     print(i+"*"+j+"="+i*j)