all: Enable ruff F841 'Local variable is assigned to but never used'.

Most of these look like they were used for print debugging and then kept in
when the print statements were removed or commented.

Some look like missing or incomplete functionality, these have been marked
with comments where possible.

Signed-off-by: Angus Gratton <angus@redyak.com.au>

micropython/bluetooth/aioble/examples/l2cap_file_client.py

@@ -85,7 +85,7 @@ async def size(self, path):
     async def download(self, path, dest):
         size = await self.size(path)
 
-        send_seq = await self._command(_COMMAND_SEND, path.encode())
+        await self._command(_COMMAND_SEND, path.encode())
 
         with open(dest, "wb") as f:  # noqa: ASYNC101
             total = 0
@@ -97,7 +97,7 @@ async def download(self, path, dest):
                 total += n
 
     async def list(self, path):
-        send_seq = await self._command(_COMMAND_LIST, path.encode())
+        await self._command(_COMMAND_LIST, path.encode())
         results = bytearray()
         buf = bytearray(self._channel.our_mtu)
         mv = memoryview(buf)

micropython/bluetooth/aioble/examples/l2cap_file_server.py

@@ -132,23 +132,20 @@ async def control_task(connection):
                 file = msg[2:].decode()
 
                 if command == _COMMAND_SEND:
-                    op_seq = seq
                     send_file = file
                     l2cap_event.set()
                 elif command == _COMMAND_RECV:
-                    op_seq = seq
                     recv_file = file
                     l2cap_event.set()
                 elif command == _COMMAND_LIST:
-                    op_seq = seq
                     list_path = file
                     l2cap_event.set()
                 elif command == _COMMAND_SIZE:
                     try:
                         stat = os.stat(file)
                         size = stat[6]
                         status = 0
-                    except OSError as e:
+                    except OSError:
                         size = 0
                         status = _STATUS_NOT_FOUND
                     control_characteristic.notify(

micropython/bluetooth/aioble/multitests/ble_descriptor.py

@@ -32,9 +32,7 @@ async def instance0_task():
     char1_desc1.write("char1_desc1")
     char1_desc2 = aioble.Descriptor(char1, CHAR1_DESC2_UUID, read=True, write=True)
     char1_desc2.write("char1_desc2")
-    char2 = aioble.Characteristic(
-        service, CHAR2_UUID, read=True, write=True, notify=True, indicate=True
-    )
+    aioble.Characteristic(service, CHAR2_UUID, read=True, write=True, notify=True, indicate=True)
     char3 = aioble.Characteristic(
         service, CHAR3_UUID, read=True, write=True, notify=True, indicate=True
     )

micropython/espflash/espflash.py

@@ -258,7 +258,6 @@ def flash_write_file(self, path, blksize=0x1000):
         print(f"Flash write size: {size} total_blocks: {total_blocks} block size: {blksize}")
         with open(path, "rb") as f:
             seq = 0
-            subseq = 0
             for i in range(total_blocks):
                 buf = f.read(blksize)
                 # Update digest

micropython/ucontextlib/tests.py

@@ -24,7 +24,7 @@ def test_context_manager(self):
     def test_context_manager_on_error(self):
         exc = Exception()
         try:
-            with self._manager(123) as x:
+            with self._manager(123):
                 raise exc
         except Exception as e:
             self.assertEqual(exc, e)

micropython/udnspkt/udnspkt.py

@@ -43,36 +43,28 @@ def parse_resp(buf, is_ipv6):
     if is_ipv6:
         typ = 28  # AAAA
 
-    id = buf.readbin(">H")
+    buf.readbin(">H")  # id
     flags = buf.readbin(">H")
     assert flags & 0x8000
-    qcnt = buf.readbin(">H")
+    buf.readbin(">H")  # qcnt
     acnt = buf.readbin(">H")
-    nscnt = buf.readbin(">H")
-    addcnt = buf.readbin(">H")
-    # print(qcnt, acnt, nscnt, addcnt)
+    buf.readbin(">H")  # nscnt
+    buf.readbin(">H")  # addcnt
 
     skip_fqdn(buf)
-    v = buf.readbin(">H")
-    # print(v)
-    v = buf.readbin(">H")
-    # print(v)
+    buf.readbin(">H")
+    buf.readbin(">H")
 
     for i in range(acnt):
         # print("Resp #%d" % i)
         # v = read_fqdn(buf)
         # print(v)
         skip_fqdn(buf)
-        t = buf.readbin(">H")
-        # print("Type", t)
-        v = buf.readbin(">H")
-        # print("Class", v)
-        v = buf.readbin(">I")
-        # print("TTL", v)
+        t = buf.readbin(">H")  # Type
+        buf.readbin(">H")  # Class
+        buf.readbin(">I")  # TTL
         rlen = buf.readbin(">H")
-        # print("rlen", rlen)
         rval = buf.read(rlen)
-        # print(rval)
 
         if t == typ:
             return rval

micropython/urllib.urequest/urllib/urequest.py

@@ -48,10 +48,10 @@ def urlopen(url, data=None, method="GET"):
         if data:
             s.write(data)
 
-        l = s.readline()
-        l = l.split(None, 2)
+        l = s.readline()  # Status-Line
+        # l = l.split(None, 2)
         # print(l)
-        status = int(l[1])
+        # status = int(l[1])  # FIXME: Status-Code element is not currently checked
         while True:
             l = s.readline()
             if not l or l == b"\r\n":

pyproject.toml

@@ -63,7 +63,6 @@ ignore = [
   "F405",
   "E501",
   "F541",
-  "F841",
   "ISC001",
   "ISC003",  # micropython does not support implicit concatenation of f-strings
   "PIE810",  # micropython does not support passing tuples to .startswith or .endswith

python-ecosys/aiohttp/aiohttp/__init__.py

@@ -104,7 +104,6 @@ async def __aexit__(self, *args):
 
     async def _request(self, method, url, data=None, json=None, ssl=None, params=None, headers={}):
         redir_cnt = 0
-        redir_url = None
         while redir_cnt < 2:
             reader = await self.request_raw(method, url, data, json, ssl, params, headers)
             _headers = []

python-ecosys/cbor2/cbor2/_decoder.py

@@ -159,7 +159,7 @@ def decode_simple_value(decoder):
 
 
 def decode_float16(decoder):
-    payload = decoder.read(2)
+    decoder.read(2)
     raise NotImplementedError  # no float16 unpack function