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/cli/cli_helpers.py

@@ -1,21 +1,9 @@
 import os
-import urllib.parse
-from typing import List
 
 import click
 from click import Context
 from loguru import logger
 
-from ...core.base import (
-    Proof,
-    TokenV1,
-    TokenV2,
-    TokenV2Mint,
-    TokenV3,
-    TokenV3Token,
-    WalletKeyset,
-)
-from ...core.helpers import sum_proofs
 from ...core.settings import settings
 from ...wallet.crud import get_keyset
 from ...wallet.wallet import Wallet as Wallet
@@ -114,7 +102,7 @@ async def verify_mint(mint_wallet: Wallet, url: str):
         print(f"Mint URL: {url}")
         print("\n")
         click.confirm(
-            f"Do you trust this mint and want to receive the tokens?",
+            "Do you trust this mint and want to receive the tokens?",
             abort=True,
             default=True,
         )