Python控制流与小实例

# while
a=0
while (a<10):
  print("hello")
  a+=1

# for循环
a=['aa','b','cc','dd']
for i in a:
  print(i)
.
for i in range(0,10):
  print(i,"hello")
.
#中断语句，continue,break
# break：全部退出
# continue：中断一次循环，继续下次循环
for i in range(0,10):
  if (i==5):
    break
  print(i,"hello")

for i in range(0,10):
  if (i==5):
    continue
  print(i,"hello")

# 乘法口诀
for i in range(1,10):
  for j in range(1,i+1):    
    print(str(j)+"*"+str(i)+"="+str(i*j)+" ",end="") #end=""表示不换行
  print()

# 逆向乘法口诀
for i in range(9,0,-1):
  for j in range(1,i+1):    
    print(str(j)+"*"+str(i)+"="+str(i*j)+" ",end="")
  print()
.
for i in range(9,0,-1):
  for j in range(i,0,-1):    
    print(str(j)+"*"+str(i)+"="+str(i*j)+" ",end="")
  print()

end