python - Make a Scatter Plot in matplotlib with dates on x axis and values on y

Question

I am having trouble making a scatter plot that has from a date array and a bunch of PM 2.5 values. My lists would look like the following:

dates = ['2015-12-20','2015-09-12']  
PM_25 = [80, 55]

Answer 1

import pandas as pd
dates = ['2015-12-20','2015-09-12']  
PM_25 = [80, 55]
dates = [pd.to_datetime(d) for d in dates]

plt.scatter(dates, PM_25, s =100, c = 'red')

s sets the size c sets the color

There are a whole bunch of other args as well: http://matplotlib.org/api/pyplot_api.html#matplotlib.pyplot.scatter