Get list of variables defined from putdata

[PBrockmann]

I cannot list the python variables defined by previous pyferret.putdata commands without loading first a dataset

import numpy as np
import pyferret

b = {}
b['name']='myvar1'
x=np.linspace(-np.pi*4, np.pi*4, 500)
b['data']=np.sin(x)/x
b.keys()

pyferret.start()

# Why to do need the following line to load a dataset and to get the list of python variables
pyferret.run('use levitus_climatology')

pyferret.putdata(b)
pyferret.run('show data')

I get

     currently SET data sets:
    1> /opt/ferret_dsets/data/levitus_climatology.cdf  (default)
 name     title                             I         J         K         L
 TEMP     TEMPERATURE                      1:360     1:180     1:20      ...
 SALT     SALINITY                         1:360     1:180     1:20      ...
 ------ Python Variables ------
 MYVAR1   myvar1                           1:500     ...       ...       ...       ...       ...

I would like to get only (without any load command)

 ------ Python Variables ------
 MYVAR1   myvar1                           1:500     ...       ...       ...       ...       ...

[karlmsmith]

The current code only adds variables to the default existing dataset. Code needs to be added to allow the data to be added to any existing dataset, or to create a dataset and add it to that new dataset. Thus, marking it as both an enhancement that is needed as well as a bug.