Python plot two lists with different length

Question

I have two lists with different prices. The first list is for the years 2008-2018 and the second for the years 2010-2018. How I can plot them under the condition that the years 2008 to 2018 are on the X-axis and the second list starts in 2010?

I have the following as an example of a short code:

from matplotlib import pyplot as plt

Geb_b30 = [11, 10, 12, 14, 16, 19, 17, 14, 18, 17]
Geb_a30 = [12, 10, 13, 14, 12, 13, 18, 16]

fig, ax = plt.subplots()
ax.plot(Geb_b30, label='Prices 2008-2018', color='blue')
ax.plot(Geb_a30, label='Prices 2010-2018', color = 'red')
legend = ax.legend(loc='center right', fontsize='x-large')
plt.xlabel('years')
plt.ylabel('prices')
plt.title('Comparison of the different prices')
plt.show()

Answer 1

I suggest you to simply define the x values (i.e. the list of years) for each set of points, and to pass them in parameters of ax.plot(), as follows:

from matplotlib import pyplot as plt

Geb_b30 = [11, 10, 12, 14, 16, 19, 17, 14, 18, 17]
years_b30 = range(2008,2018)
Geb_a30 = [12, 10, 13, 14, 12, 13, 18, 16]
years_a30 = range(2010,2018)

fig, ax = plt.subplots()
ax.plot(years_b30, Geb_b30, label='Prices 2008-2018', color='blue')
ax.plot(years_a30, Geb_a30, label='Prices 2010-2018', color = 'red')
legend = ax.legend(loc='center right', fontsize='x-large')
plt.xlabel('years')
plt.ylabel('prices')
plt.title('Comparison of the different prices')
plt.show()

Answer 2

IIUC, just pad your missing years with None/NaN:

import pandas as pd

years = list(range(2008, 2018))
Geb_b30 = [11, 10, 12, 14, 16, 19, 17, 14, 18, 17]
Geb_a30 = [None, None, 12, 10, 13, 14, 12, 13, 18, 16]
df = pd.DataFrame({"years":years, "b30": Geb_b30, "a30": Geb_a30})

df.plot(x="years")