例如, def function(data=None):
print(data,id(data))
if data is None:
data=[]
print(data,id(data))
data.append(1)
print("==================")
function()
function()
>>
我一直在处理一个问题我不明白为什么递归函数步骤返回None? 这里是代码: import sys
def minIndx(list):
x=10
indx=0
for i in range(len(list)):
if (list[i]<x):
x=list[i]
indx=i
return indx
def
我想二叉树总结节点: def average(tree):
if tree is None:
return
total = (tree['data']) + (average(tree['left'])) + (average(tree['right']))
print(total)
我也试图与“是”和“不是”,然而它仍然给了我下面的错误: TypeE
这里是我的代码: class Prizes(object):
def __init__(self, purchases, n, d):
self.p = purchases
self.n = n
self.d = d
self.x = 1
def __iter__(self):
return self
d