将Dataframe绘制为条形图，其中每列位于单独的y轴上

import pandas as pd
import matplotlib.pyplot as plt

# 创建一个示例Dataframe
data = {'Category': ['A', 'B', 'C', 'D'],
        'Value1': [10, 15, 7, 12],
        'Value2': [5, 8, 3, 10]}
df = pd.DataFrame(data)

# 设置每列的y轴
fig, ax1 = plt.subplots()
ax2 = ax1.twinx()

# 绘制条形图
df['Value1'].plot(kind='bar', color='red', ax=ax1, position=0, width=0.4)
df['Value2'].plot(kind='bar', color='blue', ax=ax2, position=1, width=0.4)

# 设置图例和标签
ax1.legend(['Value1'], loc='upper left')
ax2.legend(['Value2'], loc='upper right')
ax1.set_ylabel('Value1')
ax2.set_ylabel('Value2')
plt.xlabel('Category')

# 显示图形
plt.show()