如何只为一个值创建计数图？

import matplotlib.pyplot as plt

# 示例数组
data = [1, 2, 3, 2, 1, 3, 3, 4, 5, 4, 3, 2, 1]

# 创建空字典
count_dict = {}

# 统计每个元素的计数
for value in data:
    if value in count_dict:
        count_dict[value] += 1
    else:
        count_dict[value] = 1

# 提取键和计数
x = list(count_dict.keys())
y = list(count_dict.values())

# 创建柱状图
plt.bar(x, y)

# 设置图表标题和坐标轴标签
plt.title("Count Chart")
plt.xlabel("Value")
plt.ylabel("Count")

# 显示图表
plt.show()