python 中的嵌套循环列表理解；无法识别外循环中的变量
nested loop list comprehension in python ; can't recognize variable in outer loop
def maxXor( l, r):
return max(a^b for b in range(a,r+1) for a in range(l,r+1))
报错显示NameError: global name 'a' is not defined.
我认为错误是range(a,r+1)
这里我想要'a' in range(a,r+1) reference 'a' in inner loop for a in range(l,r+1)).
def maxXor( l, r):
return max(a^b for a in range(l,r+1) for b in range(a,r+1))
def maxXor( l, r):
return max(a^b for b in range(a,r+1) for a in range(l,r+1))
报错显示NameError: global name 'a' is not defined.
我认为错误是range(a,r+1)
这里我想要'a' in range(a,r+1) reference 'a' in inner loop for a in range(l,r+1)).
def maxXor( l, r):
return max(a^b for a in range(l,r+1) for b in range(a,r+1))