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SciTools / cartopy

Cartopy - a cartographic python library with matplotlib support
https://scitools.org.uk/cartopy/docs/latest
BSD 3-Clause "New" or "Revised" License
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Pickle crs.epsg missing argument 'code' #2042

Closed chunhei37 closed 6 months ago

chunhei37 commented 2 years ago

Description

Cannot pickle crs.epsg(). It can be dumped, but cannot be loaded.

TypeError: __init__() missing 1 required positional argument: 'code'

Code to reproduce

import pickle
import cartopy.crs as ccrs

proj = ccrs.epsg(3088)
pickle.dump(proj, open("test.pickle", "wb"))
proj = pickle.load(open("test.pickle", "rb"))

Traceback

Traceback (most recent call last):
  File "/Users/user01/opt/anaconda3/lib/python3.9/runpy.py", line 197, in _run_module_as_main
    return _run_code(code, main_globals, None,
  File "/Users/user01/opt/anaconda3/lib/python3.9/runpy.py", line 87, in _run_code
    exec(code, run_globals)
  File "/Users/user01/.vscode/extensions/ms-python.python-2022.4.1/pythonFiles/lib/python/debugpy/__main__.py", line 45, in <module>
    cli.main()
  File "/Users/user01/.vscode/extensions/ms-python.python-2022.4.1/pythonFiles/lib/python/debugpy/../debugpy/server/cli.py", line 444, in main
    run()
  File "/Users/user01/.vscode/extensions/ms-python.python-2022.4.1/pythonFiles/lib/python/debugpy/../debugpy/server/cli.py", line 285, in run_file
    runpy.run_path(target_as_str, run_name=compat.force_str("__main__"))
  File "/Users/user01/opt/anaconda3/lib/python3.9/runpy.py", line 268, in run_path
    return _run_module_code(code, init_globals, run_name,
  File "/Users/user01/opt/anaconda3/lib/python3.9/runpy.py", line 97, in _run_module_code
    _run_code(code, mod_globals, init_globals,
  File "/Users/user01/opt/anaconda3/lib/python3.9/runpy.py", line 87, in _run_code
    exec(code, run_globals)
  File "/Users/user01/1/2/3/try.py", line 6, in <module>
    proj = pickle.load(open("test1.pickle", "rb"))
TypeError: __init__() missing 1 required positional argument: 'code'
Full environment definition ### Operating system macOS ### Cartopy version 0.20.2 ### conda list ``` # Name Version Build Channel _anaconda_depends 2021.11 py39_0 _ipyw_jlab_nb_ext_conf 0.1.0 py39hecd8cb5_1 alabaster 0.7.12 pyhd3eb1b0_0 anaconda custom py39_1 anaconda-client 1.9.0 py39hecd8cb5_0 anaconda-navigator 2.1.4 py39hecd8cb5_0 anaconda-project 0.10.2 pyhd3eb1b0_0 anyio 3.5.0 py39hecd8cb5_0 appdirs 1.4.4 pyhd3eb1b0_0 applaunchservices 0.2.1 pyhd3eb1b0_0 appnope 0.1.2 py39hecd8cb5_1001 appscript 1.1.2 py39h9ed2024_0 argh 0.26.2 py39hecd8cb5_0 argon2-cffi 21.3.0 pyhd3eb1b0_0 argon2-cffi-bindings 21.2.0 py39hca72f7f_0 arrow 1.2.2 pyhd3eb1b0_0 asn1crypto 1.4.0 py_0 astroid 2.6.6 py39hecd8cb5_0 astropy 5.0.4 py39h67323c0_0 asttokens 2.0.5 pyhd3eb1b0_0 async_generator 1.10 pyhd3eb1b0_0 atomicwrites 1.4.0 py_0 attrs 21.4.0 pyhd3eb1b0_0 autopep8 1.6.0 pyhd3eb1b0_0 babel 2.9.1 pyhd3eb1b0_0 backcall 0.2.0 pyhd3eb1b0_0 backports 1.1 pyhd3eb1b0_0 backports.functools_lru_cache 1.6.4 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py39hecd8cb5_0 xz 5.2.5 h1de35cc_0 yaml 0.2.5 haf1e3a3_0 yapf 0.31.0 pyhd3eb1b0_0 zeromq 4.3.4 h23ab428_0 zfp 0.5.5 he9d5cce_6 zict 2.0.0 pyhd3eb1b0_0 zipp 3.7.0 pyhd3eb1b0_0 zlib 1.2.11 h6c3fc93_1014 conda-forge zope 1.0 py39hecd8cb5_1 zope.event 4.5.0 py39hecd8cb5_0 zope.interface 5.4.0 py39h9ed2024_0 zstd 1.5.2 h582d3a0_0 conda-forge ```
dopplershift commented 2 years ago

This is coming from the __reduce__ method on CRS: https://github.com/SciTools/cartopy/blob/63fd1e3ce7bc146a0e1a5b120441dabd4d38651c/lib/cartopy/crs.py#L203-L211

which says you can create an empty instance with just the class and no args, which is not correct, technically it's not even correct for the CRS class, but it does work for the subclasses:

proj = ccrs.CRS(ccrs.PlateCarree().to_wkt())
pickle.dump(proj, open("test.pickle", "wb"))
proj = pickle.load(open("test.pickle", "rb"))

fails.

Not sure if the right solution is fix CRS.__reduce__ or add a new implementation to ccrs._epsg._EPSGProjection.