Merge pull request wangzheng0822#90 from quanxing/master

修改了delete方法和插入方法

Author: wangzheng0822

python/05_array/myarray.py

@@ -9,35 +9,53 @@ class MyArray:
  """A simple wrapper around List.
  You cannot have -1 in the array.
  """
+
  def __init__(self, capacity: int):
+
  self._data = []
  self._count = 0
  self._capacity = capacity
 
  def __getitem__(self, position: int) -> int:
+
  """Support for subscript.
  Perhaps better than the find() method below.
  """
  return self._data[position]
 
  def find(self, index: int) -> Optional[int]:
+
  if index >= self._count or index <= -self._count: return None
  return self._data[index]
 
  def delete(self, index: int) -> bool:
+ 
  if index >= self._count or index <= -self._count: return False
+ 
  self._data[index:-1] = self._data[index+1:]
  self._count -= 1
+ # 真正将数据删除并覆盖原来的数据 ，这个需要增加
+ self._data = self._data[0:self._count]
+ print ('delet function',self._data)
  return True
 
  def insert(self, index: int, value: int) -> bool:
- if index >= self._count or index <= -self._count: return False
+
+ #if index >= self._count or index <= -self._count: return False
  if self._capacity == self._count: return False
- self._data.insert(index, value)
+ # 如果还有空间，那么插入位置大于当前的元素个数，可以插入最后的位置
+ if index >= self._count:
+ self._data.append(value)
+ # 同上，如果位置小于0 可以插入第０个位置.
+ if index < 0:
+ print (index)
+ self._data.insert(0, value)
+
  self._count += 1
  return True
 
  def insert_to_tail(self, value: int) -> bool:
+
  if self._count == self._capacity: return False
  if self._count == len(self._data):
  self._data.append(value) 
@@ -47,19 +65,24 @@ def insert_to_tail(self, value: int) -> bool:
  return True
 
  def __repr__(self) -> str:
+
  return " ".join(str(num) for num in self._data[:self._count])
 
  def print_all(self):
+
  for num in self._data[:self._count]:
- print(f"{num}", end=" ")
+ print("{num}", end=" ")
  print("\n", flush=True)
 
 if __name__ == "__main__":
  a = MyArray(6)
  for i in range(6):
  a.insert_to_tail(i)
 
- a.delete(2)
- print(a)
- a.insert_to_tail(7)
- print(a)
+ print('origin',a)
+ a.delete(4)
+ print ('delete ',a)
+
+ a.insert(100,10000)
+ print (a)
+