Deprecation error with matplotlib.pyplot.gca(projection='3d')

[tran0923]

Per matplotlib's official documentation pyplot.gca will no longer accept keyword arguments.

For imexam, this breaks code like:
ax = fig.gca(projection='3d')
at line 1626 in imexamine.py.

One potential fix might be to use ax = fig.add_subplot(projection='3d') instead as suggested here.

This is only relevant for matplotlib version 3.4 and higher and can be avoided locally by using older versions.

[asteroidnerd]

This is in line 1628+1629 in my version? Fixed by replacing
1628 fig.add_subplot(111)
1629 ax = fig.gca(projection='3d')
with
1628 ax = fig.add_subplot(111, projection='3d')