python 基本语法 遍历 for while

python 基本语法 遍历 for while

##普通遍历
a="123abc"
b=[1,2,3,4,5]
c=(1,2,3,"a","b","c")

for x in b: 
    if x >= 2:
        print(x,end=" ")
        
print(".") 

for x in range(len(a)):
   print(x,end=' ')
   
##字典遍历
d={1:111,2:2222,3:3333,4:4444}

for x in d:
    print(d[x])

# 取字典集合  
# print(d.items())

#拆分
for k,v in d.items():
    print(k)
    print(v)
else: #正常执行后就会输出
  print("ending")
    
    
    
    
    
    
    
    


#循环控制 
for x in range(1,10):
    print(x)
    if x==3: 
        pass #暂位       什么都不做
    if x==2:
      print("continue")
      continue
    if x==6:   #停止    
        break
    print("#"*10) #会输出
else:
    print("ending")
 ## 分开   
for x in range(1,11):
    print("----->",x)


while

from pip._vendor.distlib.compat import raw_input

while True:
    print("hello")
    x=raw_input("please,q for quit:") #输入q 结束
    if x =="q":
        print("brake----------->")
        break;
       
x="a"
while x != "q":
    print(x)
    x=raw_input("please input q exit:")
    if not x : #如果为null 退了, 什么都不输
      print("空 break")
      break
else: #输q 会输出
    print("ending.......")
   


你可能感兴趣的:(python)