Cannot import foma to Python

[Jasur Yusupov]

Installed foma:

sudo apt-get install foma

Downloaded foma.py as a module into my Python virtual environment:

Tried to import foma and got an error:

Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
  File "/home/username/dir/venv/lib/python3.8/site-packages/foma/__init__.py", line 107, in <module>
    foma_add_defined_function = foma.add_defined_function
  File "/usr/lib/python3.8/ctypes/__init__.py", line 386, in __getattr__
    func = self.__getitem__(name)
  File "/usr/lib/python3.8/ctypes/__init__.py", line 391, in __getitem__
    func = self._FuncPtr((name_or_ordinal, self))
AttributeError: /lib/x86_64-linux-gnu/libfoma.so.0: undefined symbol: add_defined_function

Python documentation is unclear!

[Jasur Yusupov]

Seems like the issue was in libfoma0 version (1:0.9.18)

$ sudo apt list -a libfoma0
Listing... Done
libfoma0/focal,now 1:0.9.18+r243-6 amd64 [installed,automatic]
libfoma0/unknown 0.10.0+s305-3~focal1 amd64

Installing version 0.10.0 solved the problem:

sudo apt-get install libfoma0=0.10.0+s305-3~focal1