Matplotlib package is installed, and the code is not working

Question

The code is not working, but in the site "repl.it" it´s working,, nothing happens. the fig.show() should print a graphic chart.

import matplotlib.pyplot as plt

seq_human = {'AA': 116, 'AT': 95, 'AC': 97, 'AG': 113, 'TA': 85, 'TT': 113, 'TC': 109, 'TG': 111, 'CA': 87, 'CT': 105, 'CC': 184, 'CG': 170, 'GA': 134, 'GT': 105, 'GC': 155, 'GG': 184}
seq_bacteria = {'AA': 105, 'AT': 64, 'AC': 86, 'AG': 111, 'TA': 64, 'TT': 57, 'TC': 60, 'TG': 108, 'CA': 83, 'CT': 75, 'CC': 74, 'CG': 97, 'GA': 113, 'GT': 93, 'GC': 109, 'GG': 147}


fig, (ax1, ax2) = plt.subplots(1, 2, figsize=(16, 5))

ax1.bar(seq_human.keys(), seq_human.values(), width=0.4, align='edge', label='Human: 18S rRNA gene')
ax1.bar(seq_bacteria.keys(), seq_bacteria.values(), width=-0.4, align='edge', label='Bacteria: Escherichia coli 16S ribosomal')
ax1.set_ylabel('Frequency')
ax1.set_xlabel('Nitrogenous Bases')
ax1.legend()
fig.show()

Answer 1

From the doc string of fig.show

Warning:

This does not manage an GUI event loop. Consequently, the figure may only be shown briefly or not shown at all if you or your environment are not managing an event loop.

Proper use cases for .Figure.show include running this from a GUI application or an IPython shell.

If you're running a pure python shell or executing a non-GUI python script, you should use matplotlib.pyplot.show instead , which takes care of managing the event loop for you.

emphasis is mine…