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/wallet/api/router.py

@@ -1,4 +1,3 @@
-import asyncio
 import os
 from datetime import datetime
 from itertools import groupby, islice
@@ -119,7 +118,7 @@ async def invoice(
     global wallet
     wallet = await load_mint(wallet, mint)
     if not settings.lightning:
-        r = await wallet.mint(amount, split=optional_split)
+        await wallet.mint(amount, split=optional_split)
         return InvoiceResponse(
             amount=amount,
         )
@@ -392,7 +391,7 @@ async def wallets():
                             }
                         }
                     )
-        except:
+        except Exception:
             pass
     return WalletsResponse(wallets=result)
 
@@ -417,7 +416,7 @@ async def info():
             client = NostrClient(private_key=settings.nostr_private_key, connect=False)
             nostr_public_key = client.private_key.bech32()
             nostr_relays = settings.nostr_relays
-        except:
+        except Exception:
             nostr_public_key = "Invalid key"
             nostr_relays = []
     else: