flake8 . --count --select="$ELECTRUM_LINTERS" --ignore="$ELECTRUM_LINTERS_IGNORE" --show-source --statistics --exclude "*_pb2.py,electrum/_vendor/"
./electrum/plugins/ledger/ledger.py:369:29: F821 undefined name 'btchip'
        self.dongleObject = btchip(HIDDongleHIDAPI(dev, True, False))
                            ^
./electrum/plugins/ledger/ledger.py:369:36: F821 undefined name 'HIDDongleHIDAPI'
        self.dongleObject = btchip(HIDDongleHIDAPI(dev, True, False))
                                   ^
./electrum/plugins/ledger/ledger.py:447:25: F821 undefined name 'compress_public_key'
            publicKey = compress_public_key(nodeData['publicKey'])
                        ^
./electrum/plugins/ledger/ledger.py:454:21: F821 undefined name 'compress_public_key'
        publicKey = compress_public_key(nodeData['publicKey'])
                    ^
./electrum/plugins/ledger/ledger.py:463:48: F821 undefined name 'btchip'
    def has_detached_pin_support(self, client: 'btchip'):
                                               ^
./electrum/plugins/ledger/ledger.py:467:16: F821 undefined name 'BTChipException'
        except BTChipException as e:
               ^
./electrum/plugins/ledger/ledger.py:472:40: F821 undefined name 'btchip'
    def is_pin_validated(self, client: 'btchip'):
                                       ^
./electrum/plugins/ledger/ledger.py:476:16: F821 undefined name 'BTChipException'
        except BTChipException as e:
               ^
./electrum/plugins/ledger/ledger.py:519:16: F821 undefined name 'BTChipException'
        except BTChipException as e:
               ^
./electrum/plugins/ledger/ledger.py:658:29: F821 undefined name 'bitcoinTransaction'
                    txtmp = bitcoinTransaction(bfh(utxo[0]))
                            ^
./electrum/plugins/ledger/ledger.py:736:16: F821 undefined name 'BTChipException'
        except BTChipException as e:
               ^
./electrum/plugins/ledger/ledger.py:775:16: F821 undefined name 'BTChipException'
        except BTChipException as e:
               ^
./electrum/plugins/ledger/ledger.py:827:22: F821 undefined name 'HIDDongleHIDAPI'
        hid_device = HIDDongleHIDAPI(dev, ledger, debug=False)
                     ^
./electrum/plugins/ledger/ledger.py:828:29: F821 undefined name 'btchip'
        self.dongleObject = btchip(hid_device)
                            ^
./electrum/plugins/ledger/ledger.py:852:20: F821 undefined name 'BTChipException'
            except BTChipException as e:
                   ^
./electrum/plugins/ledger/ledger.py:871:16: F821 undefined name 'BTChipException'
        except BTChipException as e:
               ^
16    F821 undefined name 'btchip'
16