用Python判断任意整数x是否是质数

def is_prime(x):
    if x inrange(0,2):
       return False
    else:
       if x>=2:
           for n in range(2,x):
               if x%n==0:
                   return False
                   break
           else:
               return True
       elif x<2:
           for n in range(x,2):
               if x%n==0:
                   return False
                   break
           else:      
               return True
用Python实现字符串反转

def reverse(text):
   text=list(text)
   
  
    for i inrange(len(text)):
       if i<=len(text)-i-1:
           temp=text[i]
           text[i]=text[len(text)-1-i]
           text[len(text)-i-1]=temp
    return"".join(text) #将序列转换成字符串