In this exercise you summarise a year of rainfall measurements with pandas and draw the result as a bar chart with matplotlib.

Each measurement is a [month, rainfall] pair, where month is an integer from 1 (January) to 12 (December) and rainfall is an amount in millimetres. There can be any number of measurements per month, in any order.

Assignment

Write a function rainfall_chart(records) that:

1. computes the total rainfall per month and returns it as a list of twelve integers, ordered from January to December. Months without any measurement get a total of 0.
2. draws a bar chart of those monthly totals (the month on the horizontal axis, the total rainfall on the vertical axis) and shows it with plt.show().

Example

>>> rainfall_chart([[1, 12], [1, 8], [2, 5], [2, 5], [3, 20]])
[20, 10, 20, 0, 0, 0, 0, 0, 0, 0, 0, 0]

(and a bar chart is drawn)

When you submit, the judge captures the chart your code draws and shows it back to you in the feedback below the test results, so you can see exactly what your code produced.