FEAT: Add flake8 (#267)

* init flake8

* exclude nostr client, and add ds_store to gitignore

* fix flake8 F811 issue, redefinition of unused variables

* add flake8 to workflow

* F401 unused imports

* F541 f-string is missing placeholders

* E501 line too long > 150 characters

* E722 no bare except

* E402 module level import not at top of file

* F405 no star imports

* E712 comparison to False should be 'if cond is False:'

* F841 local variable is assigned to but never used

* E266 too many leading '#' for block comment

* E265, E261

* E713 test for membership should be 'not in'

* E711, E741

E741 ambiguous variable name 'l'
E711 comparison to None should be 'if cond is None:'

* flake config

* isort

* refactor makefile flake8 usage

* reflaking the rebase

* black

* fix tests?

* black

* fix line lenght it test_cli

* sort out makefile

* fix strings

* reintroduce black-check

* reflake and mypy

* isort

* Update cashu/wallet/wallet.py

Co-authored-by: Angus Pearson <angus@toaster.cc>

* Update cashu/mint/ledger.py

Co-authored-by: Angus Pearson <angus@toaster.cc>

---------

Co-authored-by: Angus Pearson <angus@toaster.cc>

cashu/tor/tor.py

@@ -91,7 +91,7 @@ class TorProxy:
         try:
             logger.debug(f"Setting permissions of {PATHS[platform.system()]} to 755")
             os.chmod(PATHS[platform.system()], 0o755)
-        except:
+        except Exception:
             logger.debug("Exception: could not set permissions of Tor binary")
         return PATHS[platform.system()]
 
@@ -138,7 +138,7 @@ class TorProxy:
             s.connect(location)
             s.close()
             return True
-        except Exception as e:
+        except Exception:
             return False
 
     def read_pid(self):
@@ -163,7 +163,7 @@ class TorProxy:
         pid = int(pid)
         try:
             os.kill(pid, signal)
-        except:
+        except Exception:
             return False
         else:
             return True