问Geopandas上的Colorbar

EN

import geopandas as gp
import pandas as pd
import matplotlib.pyplot as plt

#Import csv data
df = df.from_csv('data.csv')

#Convert Pandas DataFrame to GeoPandas DataFrame
g_df = g.GeoDataFrame(df)

#Plot
plt.figure(figsize=(15,15)) 
g_plot = g_df.plot(column='column_name',colormap='hot',alpha=0.08)
plt.colorbar(g_plot)

AttributeError                            Traceback (most recent call last)
<ipython-input-55-5f33ecf73ac9> in <module>()
      2 plt.figure(figsize=(15,15))
      3 g_plot = g_df.plot(column = 'column_name', colormap='hot', alpha=0.08)
----> 4 plt.colorbar(g_plot)

...

AttributeError: 'AxesSubplot' object has no attribute 'autoscale_None'