Error renameDimension / renameVariable

[pgamez]

Hello

When using renameVariable after renameDimension on a coordinate, all the values from the variable are removed.

Here is a code that could reproduce the problem (version 1.4.0):

#!/usr/bin/env python3

import netCDF4 as nc

with nc.Dataset('test.nc', 'w') as fp:
    fp.createDimension('x', 3)
    ncvar = fp.createVariable('x', float, ('x',))
    ncvar[:] = [1.1, 2.2, 3.3]

with nc.Dataset('test.nc', 'r+') as fp:
    fp.renameDimension('x', 'lon')
    fp.renameVariable('x', 'lon')

I expect a variable lon with values [1.1, 2.2, 3.3]. However, the result is this:

$ ncdump test.nc
netcdf test {
dimensions:
	lon = 3 ;
variables:
	double lon(lon) ;
data:

 lon = _, _, _ ;
}

This problem doesn't happens when executing first renameVariable and then renameDimension

Greetings,

Pedro

[jswhit]

In your case, the variable is also a dimension - so I think it makes sense that you have to rename the variable before renaming the dimension. This is because the dimension information is attached to the variable, if you change the the dimension name first you are breaking this connection.

[pgamez]

OK Jeff, thank you! I didn't have that information...
Pedro