Why is my plt.savefig is not working?

I have a simple python code as follows:

import numpy as np
import matplotlib.pyplot as plt

"""
Here are the solutions and the plot.
"""

# Create the axis and plot.
plt.axis([0, 10, 0, 10])
axis_x = range(1, 11)
grd = [1.1, 2.1, 3.1, 4.1, 5.1, 6.1, 7.1, 8.1, 9.1, 10.1]
grd2 = [1.2, 2.2, 3.2, 4.2, 5.2, 6.2, 7.2, 8.2, 9.2, 10.2]
plt.plot(axis_x, grd, '-g', label='BR1')
plt.plot(axis_x, grd2, '-b', label='BR2')
plt.legend(loc='upper left')
plt.grid()
plt.show()

# Save the results vector to a text file.
np.savetxt('test.out', (grd, grd2))

# Save the figure as '.eps' file.
plt.savefig('expl.pdf', format='pdf', dpi=1200)

When I open the output files expl.pdf and/or test.out I find them blank and nothing in there. Why?

Thanks.

When you close the image displayed by plt.show(), the image is closed and freed from memory.

You should call savefig and savetxt before calling show.

I just ran into the same issue and the resolution was to put the savefig command before the plt.show() statement, but specify the filetype explicitly. Here is my code:

plt.suptitle("~~~~")
plt.title("~~~~")
ax = sns.boxplot(x=scores_df.score, y=scores_df.response)
plt.savefig("test.png", format="png") # specify filetype explicitly
plt.show()

plt.close()

Your plot cannot be generated because you defined the list axis_x having only the length 9, while grd and grd2 have the length equal to 10. Just replace the definition of axis_x with:

axis_x=range(1,11) and your plot will show up and it will be saved OK.