Python——循环

for x in range(1,21):
    if x==20:
        print(x)
    else:
        print(x,end=' ')

for x in range(1,21):
    if x%5==0:
        print(x)
    else:
        print(x,end=' ')

#我用了多组输入
while True:
    try:
        n=int(input())
        for i in range(n):
            for j in range(n-i-1):
                print(" ",end='')
            for j in range(2*i+1):
                print("*",end='')
            print("");
        for i in range(n):
            for j in range(n-1):
                print(" ",end='')
            print("*")
    except:break

for i in range(1,10):
    for j in range(i):
        sum=i*(j+1)
        if(j==i-1):
            print(j+1,"x",i,"=",sum,sep='')
        else:
            print(j + 1, "x", i, "=", sum, sep='',end=' ')

a=0
b=1
for i in range(20):
    print(b,end=' ')
    b=a+b
    a=b