No module named 'lupa' in fake redis

Question

When I was using lock.release from fakeredis lib, I got below exception:

   File "/usr/local/lib/python3.6/site-packages/redis/lock.py", line 111, in acquire
     if self.do_acquire(token):
   File "/usr/local/lib/python3.6/site-packages/redis/lock.py", line 258, in do_acquire
     client=self.redis))
   File "/usr/local/lib/python3.6/site-packages/redis/client.py", line 2950, in __call__
     return client.evalsha(self.sha, len(keys), *args)
   File "/usr/local/lib/python3.6/site-packages/redis/client.py", line 2079, in evalsha
     return self.execute_command('EVALSHA', sha, numkeys, *keys_and_args)
   File "/usr/local/lib/python3.6/site-packages/redis/client.py", line 667, in execute_command
     connection.send_command(*args)
   File "/usr/local/lib/python3.6/site-packages/redis/connection.py", line 610, in send_command
     self.send_packed_command(self.pack_command(*args))
   File "/usr/local/lib/python3.6/site-packages/redis/connection.py", line 590, in send_packed_command
     self._sock.sendall(item)
   File "/usr/local/lib/python3.6/site-packages/fakeredis/_server.py", line 808, in sendall
     self._parser.send(data)
   File "/usr/local/lib/python3.6/site-packages/fakeredis/_server.py", line 725, in _parse_commands
     self._process_command(fields)
   File "/usr/local/lib/python3.6/site-packages/fakeredis/_server.py", line 827, in _process_command
     result = self._run_command(func, sig, fields[1:], False)
   File "/usr/local/lib/python3.6/site-packages/fakeredis/_server.py", line 741, in _run_command
     result = func(*args)
   File "/usr/local/lib/python3.6/site-packages/fakeredis/_server.py", line 2439, in evalsha
     return self.eval(script, numkeys, *keys_and_args)
   File "/usr/local/lib/python3.6/site-packages/fakeredis/_server.py", line 2386, in eval
     from lupa import LuaRuntime, LuaError, as_attrgetter
 No module named 'lupa'

I didn't find a similar question (So far) so I just wanted to share the solution for those people who will face this exception in the future

Answer 1

As mentioned in the doc,

Although fakeredis is pure Python, you will need lupa if you want to run Lua scripts (this includes features like redis.lock.Lock, which are implemented in Lua). If you install fakeredis with pip install fakeredis[lua] it will be automatically installed.

So:

pip install fakeredis[lua]