十流程控制的for循环

Posted 2021-03-19 linjiahua

for的循环控制

game_list=['xiaoziaokan','kaixinxiaole','tiaoyitiao','chaojimali','ranzheshengui','hundluo']
ins=0
while ins < 6:
    print(game_list[ins])
    ins += 1

xiaoziaokan
kaixinxiaole
tiaoyitiao
chaojimali
ranzheshengui
hundluo

for的运用

for i in 列表or字典：
print（i）i代表了是字典或列表的值

for i in game_list:
    print(i)

xiaoziaokan
kaixinxiaole
tiaoyitiao
chaojimali
ranzheshengui
hundluo

for +break

for i in game_list:
    if i == 'chaojimali':
        break  #循环到chaojimali这里停止所以输出的是前三个
    print(i)

xiaoziaokan
kaixinxiaole
tiaoyitiao

for+ continue

for i in game_list:
    if i == 'chaojimali':
        continue  #循环到chaojimali这里跳过除了chaojimali不输出其他正常输出
    print(i)

xiaoziaokan
kaixinxiaole
tiaoyitiao
ranzheshengui
hundluo

for+else

for i in game_list:
    if i == 'chaojimali':
        continue  #循环到chaojimali这里跳过除了chaojimali不输出其他正常输出
    print(i)
    
else:
    print('我没有被跳过')

xiaoziaokan
kaixinxiaole
tiaoyitiao
ranzheshengui
hundluo
我没有被跳过

for i in game_list:
    if i == 'chaojimali':
        break  #循环到chaojimali这里跳过除了chaojimali不输出其他正常输出
    print(i)
    
else:
    print('我被跳过了')

xiaoziaokan
kaixinxiaole
tiaoyitiao

for的嵌套

print('laoding',end='')
for i in range(6):
    print('.',end='')

laoding......

n = 5
for i in range(1, n+1): # 控制三角形的高,也就是层数
    for k in range(2*(n-i)):  # 控制每层第一个*的空格,从最后一层往上数分别是0, 2, 4, 6....,因为三角形越大,
        #第一层空格反而越多,想起这个应该跟i
        #有关,而且肯定是被减的那个数,发现刚好是2n-2i 
         print("",end=" ")
    for j in range(1, 2*i):     # 控制每层*的个数,由于是1,3,5,7,9...所以很快知道是2i-1
          print("*",end=' ')
    print()

        * 
      * * * 
    * * * * * 
  * * * * * * * 
* * * * * * * * * 

n = 5
for i in range(1, n+1): # 控制三角形的高,也就是层数
    for k in range(2*(n-i)):    # 控制空格
        print("",end=" ")
    if 1 < i < n:
        print("*",end="")
        for j in range(1, (2*(i-1)-1)*2 + 1 +1):
                print(" ",end='')
        print("*", end="")
    else:
        for j in range(1, 2*i): # 控制每层*的个数,由于是1,3,5,7,9...所以很快知道是2i-1
                print("*",end=' ')
    print()

        * 
      *   *
    *       *
  *           *
* * * * * * * * *