如何使用 Dataframe 和 Python 中的 mathplotlib 设置轴标题和主标题？

Question

I am trying to set axis labels and a graph title using Dataframe and mathplotlib.

Below is my code:

# Plot line chart showing average, minimum, and maximum temperature
title = "Daily minimum, average, and maximum temperatures - 2022 San Diego, CA"
fig, ax = plt.subplots()
ax.set_title(title, fontsize=20)
ax.set_xlabel('Dates', fontsize=16)
fig.autofmt_xdate()
ax.set_ylabel("Temperature (C)", fontsize=16)
data.plot(y=['tavg', 'tmin', 'tmax'])
plt.show()

I was expecting all to be on one graph.

However, when I run the code, it makes and shows two separate graphs. One graph only showing the data (the average, minimum, and maximum temperatures) and axis numbers. Another graph showing only the axis labels and graph title. I am trying to put all on one graph.

Answer 1

When plotting with the pandas utility you need to specify the matplotlib axis object you want to place the plot in if you don't want a new figure ie:

# Plot line chart showing average, minimum, and maximum temperature
title = "Daily minimum, average, and maximum temperatures - 2022 San Diego, CA"
fig, ax = plt.subplots()
ax.set_title(title, fontsize=20)
ax.set_xlabel('Dates', fontsize=16)
fig.autofmt_xdate()
ax.set_ylabel("Temperature (C)", fontsize=16)
data.plot(y=['tavg', 'tmin', 'tmax'], ax=ax) #set the ax argument here 
plt.show()