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I try to build a graphy with one x-axis and two y-axes, with all axes comming from a dataframe (similar to the graphs here). Here are my example data:
import pandas as pd
df = pd.DataFrame(data={'year': [2000, 2001, 2002],
'deaths': [327, 456, 509],
'cheese': [13.5, 13.7, 13.8]})
I only found questions covering multiple lines based on a categorical variable (what I don't need) or more than two axis with an answer I, as a beginner, don't understand.
1 Answer
The matplotlib.pyplot module creates a figure and axes object (see help(plt.subplots) for details) that can be used to create a plot as requested:
import matplotlib.pyplot as plt # Impot the relevant module
fig, ax = plt.subplots() # Create the figure and axes object
# Plot the first x and y axes:
df.plot(x = 'year', y = 'deaths', ax = ax)
# Plot the second x and y axes. By secondary_y = True a second y-axis is requested:
# (see for details)
df.plot(x = 'year', y = 'cheese', ax = ax, secondary_y = True)
Output:
