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@@ -933,40 +933,45 @@ comments: true
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=== "Python"
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```python title="my_list.py"
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""" 列表类简易实现 """
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class MyList:
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""" 构造方法 """
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""" 列表类简易实现 """
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def __init__(self):
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""" 构造方法 """
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self.__capacity = 10 # 列表容量
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self.__nums = [0] * self.__capacity # 数组(存储列表元素)
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self.__size = 0 # 列表长度(即当前元素数量)
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self.__extend_ratio = 2 # 每次列表扩容的倍数
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""" 获取列表长度(即当前元素数量) """
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def size(self):
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""" 获取列表长度(即当前元素数量) """
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return self.__size
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""" 获取列表容量 """
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def capacity(self):
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""" 获取列表容量 """
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return self.__capacity
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""" 访问元素 """
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def get(self, index):
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""" 访问元素 """
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# 索引如果越界则抛出异常,下同
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assert index >= 0 and index < self.__size, "索引越界"
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return self.__nums[index]
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""" 更新元素 """
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def set(self, num, index):
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""" 更新元素 """
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assert index >= 0 and index < self.__size, "索引越界"
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self.__nums[index] = num
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def add(self, num):
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""" 尾部添加元素 """
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# 元素数量超出容量时,触发扩容机制
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if self.size() == self.capacity():
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self.extend_capacity();
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self.__nums[self.__size] = num
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self.__size += 1
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""" 中间插入(尾部添加)元素 """
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def add(self, num, index=-1):
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def insert(self, num, index):
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""" 中间插入元素 """
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assert index >= 0 and index < self.__size, "索引越界"
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# 若不指定索引 index ,则向数组尾部添加元素
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if index == -1:
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index = self.__size
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# 元素数量超出容量时,触发扩容机制
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if self.__size == self.capacity():
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self.extend_capacity()
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@@ -977,10 +982,10 @@ comments: true
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# 更新元素数量
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self.__size += 1
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""" 删除元素 """
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def remove(self, index):
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""" 删除元素 """
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assert index >= 0 and index < self.__size, "索引越界"
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num = self.nums[index]
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num = self.__nums[index]
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# 索引 i 之后的元素都向前移动一位
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for j in range(index, self.__size - 1):
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self.__nums[j] = self.__nums[j + 1]
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@@ -989,15 +994,15 @@ comments: true
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# 返回被删除元素
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return num
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""" 列表扩容 """
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def extend_capacity(self):
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""" 列表扩容 """
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# 新建一个长度为 self.__size 的数组,并将原数组拷贝到新数组
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self.__nums = self.__nums + [0] * self.capacity() * (self.__extend_ratio - 1)
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# 更新列表容量
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self.__capacity = len(self.__nums)
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""" 返回有效长度的列表 """
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def to_array(self):
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""" 返回有效长度的列表 """
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return self.__nums[:self.__size]
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```
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@@ -1311,7 +1316,7 @@ comments: true
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public toArray(): number[] {
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let size = this.size();
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// 仅转换有效长度范围内的列表元素
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let nums = new Array(size);
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const nums = new Array(size);
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for (let i = 0; i < size; i++) {
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nums[i] = this.get(i);
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}
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