无法绘制日期时间 pandas 系列与 matplotlib

Question

I'm trying to plot "created_at" versus "rating".

"Created_at" is datetime format

Why is the x-axis being shown as float values instead of dates like I am intending with the line

plt.plot(data['created_at'].values, data['rating'],"b.", alpha =0.5)

shown in the bottom picture

Answer 1

The easiest way to achieve this is to define a temporary dataframe with the datetimes as index (see this SO post ):

rating_vs_creationdate = data.copy()
rating_vs_creationdate = rating_vs_creationdate.set_index('created_at')
rating_vs_creationdate = rating_vs_creationdate['rating']
plt.plot(rating_vs_creationdate)

Maybe you will run into problems with the date format. The link provided by MrFuppes in the comments gives an easy date formatting example.