Cannot pickle TransformerLocal object

[jolivetr]

Dear all,

I have the impression that some objects cannot be pickled in pyproj. I saw that issue #897 raised the problem which got solved in #901, but I still cannot pickle a TransformerLocal object.

Here is an example of what does not work on my machine.

import pickle

import pyproj as pp
from pyproj import Transformer

utm = pp.CRS(proj='utm', zone=10, ellps='WGS84')

trans = Transformer.from_crs(pp.CRS('WGS84'), utm, always_xy=True)

with open('temp.pickle', 'wb') as f:
    pickle.dump(trans, f)

with open('temp.pickle', 'rb') as f:
    trans_unpickled = pickle.load(f)

print(trans == trans_unpickled)

Problem description

Running this little script returns a TypeError: cannot pickle 'TransformerLocal' object

Environment Information

• pyproj version 3.3.0
• PROJ version 8.2.0
• PROJ data directory /opt/local/lib/proj8/share/proj
• Python version 3.8.13 (default, Mar 17 2022, 17:04:31) [Clang 13.0.0 (clang-1300.0.29.30)]
• Operation System Information macOS-12.2.1-x86_64-i386-64bit

Installation method

MacPorts