diff --git a/src/modules/python/picoweb/__init__.py b/src/modules/python/picoweb/__init__.py
index 315de6e..9c23e46 100644
--- a/src/modules/python/picoweb/__init__.py
+++ b/src/modules/python/picoweb/__init__.py
@@ -28,10 +28,10 @@ def get_mime_type(fname):
 def sendstream(writer, f):
     buf = bytearray(64)
     while True:
-        l = f.readinto(buf)
-        if not l:
+        if l := f.readinto(buf):
+            yield from writer.awrite(buf, 0, l)
+        else:
             break
-        yield from writer.awrite(buf, 0, l)
 
 
 def jsonify(writer, dict):
@@ -47,7 +47,7 @@ def start_response(writer, content_type="text/html", status="200", headers=None)
         yield from writer.awrite("\r\n\r\n")
         return
     yield from writer.awrite("\r\n")
-    if isinstance(headers, bytes) or isinstance(headers, str):
+    if isinstance(headers, (bytes, str)):
         yield from writer.awrite(headers)
     else:
         for k, v in headers.items():
@@ -81,14 +81,8 @@ def parse_qs(self):
 class WebApp:
 
     def __init__(self, pkg, routes=None, serve_static=True):
-        if routes:
-            self.url_map = routes
-        else:
-            self.url_map = []
-        if pkg and pkg != "__main__":
-            self.pkg = pkg.split(".", 1)[0]
-        else:
-            self.pkg = None
+        self.url_map = routes or []
+        self.pkg = pkg.split(".", 1)[0] if pkg and pkg != "__main__" else None
         if serve_static:
             self.url_map.append((re.compile("^/(static/.+)"), self.handle_static))
         self.mounts = []
@@ -117,7 +111,7 @@ def _handle(self, reader, writer):
             request_line = yield from reader.readline()
             if request_line == b"":
                 if self.debug >= 0:
-                    self.log.error("%s: EOF on request start" % reader)
+                    self.log.error(f"{reader}: EOF on request start")
                 yield from writer.aclose()
                 return
             req = HTTPRequest()
@@ -127,9 +121,7 @@ def _handle(self, reader, writer):
             if self.debug >= 0:
                 self.log.info('%.3f %s %s "%s %s"' % (utime.time(), req, writer, method, path))
             path = path.split("?", 1)
-            qs = ""
-            if len(path) > 1:
-                qs = path[1]
+            qs = path[1] if len(path) > 1 else ""
             path = path[0]
 
             #print("================")
@@ -148,7 +140,7 @@ def _handle(self, reader, writer):
                         found = True
                         path = path[len(root):]
                         if not path.startswith("/"):
-                            path = "/" + path
+                            path = f"/{path}"
                         break
                 if not found:
                     break
@@ -170,22 +162,12 @@ def _handle(self, reader, writer):
                     found = True
                     break
                 elif not isinstance(pattern, str):
-                    # Anything which is non-string assumed to be a ducktype
-                    # pattern matcher, whose .match() method is called. (Note:
-                    # Django uses .search() instead, but .match() is more
-                    # efficient and we're not exactly compatible with Django
-                    # URL matching anyway.)
-                    m = pattern.match(path)
-                    if m:
+                    if m := pattern.match(path):
                         req.url_match = m
                         found = True
                         break
 
-            if not found:
-                headers_mode = "skip"
-            else:
-                headers_mode = extra.get("headers", self.headers_mode)
-
+            headers_mode = extra.get("headers", self.headers_mode) if found else "skip"
             if headers_mode == "skip":
                 while True:
                     l = yield from reader.readline()
@@ -205,7 +187,7 @@ def _handle(self, reader, writer):
             else:
                 yield from start_response(writer, status="404")
                 yield from writer.awrite("404\r\n")
-            #print(req, "After response write")
+                #print(req, "After response write")
         except Exception as e:
             if self.debug >= 0:
                 self.log.exc(e, "%.3f %s %s %r" % (utime.time(), req, writer, e))
@@ -294,7 +276,7 @@ def run(self, host="127.0.0.1", port=8081, debug=False, lazy_init=False, log=Non
                 app.init()
         loop = asyncio.get_event_loop()
         if debug > 0:
-            print("* Running on http://%s:%s/" % (host, port))
+            print(f"* Running on http://{host}:{port}/")
         loop.create_task(asyncio.start_server(self._handle, host, port))
         loop.run_forever()
         loop.close()
diff --git a/src/modules/python/pkg_resources.py b/src/modules/python/pkg_resources.py
index 9ab28e9..1e2f0ea 100644
--- a/src/modules/python/pkg_resources.py
+++ b/src/modules/python/pkg_resources.py
@@ -6,7 +6,7 @@ def resource_stream(package, resource):
     if package not in c:
         try:
             if package:
-                p = __import__(package + ".R", None, None, True)
+                p = __import__(f"{package}.R", None, None, True)
             else:
                 p = __import__("R")
             c[package] = p.R
@@ -19,7 +19,7 @@ def resource_stream(package, resource):
 #            if d[0] != "/":
 #                import uos
 #                d = uos.getcwd() + "/" + d
-            c[package] = d + "/"
+            c[package] = f"{d}/"
 
     p = c[package]
     if isinstance(p, dict):
diff --git a/src/modules/python/uasyncio/__init__.py b/src/modules/python/uasyncio/__init__.py
index 41fa572..d83aa4c 100644
--- a/src/modules/python/uasyncio/__init__.py
+++ b/src/modules/python/uasyncio/__init__.py
@@ -65,12 +65,7 @@ def remove_writer(self, sock):
     def wait(self, delay):
         if DEBUG and __debug__:
             log.debug("poll.wait(%d)", delay)
-        # We need one-shot behavior (second arg of 1 to .poll())
-        res = self.poller.ipoll(delay, 1)
-        #log.debug("poll result: %s", res)
-        # Remove "if res" workaround after
-        # https://github.com/micropython/micropython/issues/2716 fixed.
-        if res:
+        if res := self.poller.ipoll(delay, 1):
             for sock, ev in res:
                 cb = self.objmap[id(sock)]
                 if ev & (select.POLLHUP | select.POLLERR):
diff --git a/src/modules/python/uasyncio/core.py b/src/modules/python/uasyncio/core.py
index 77fdb7a..ebebbf9 100644
--- a/src/modules/python/uasyncio/core.py
+++ b/src/modules/python/uasyncio/core.py
@@ -105,10 +105,7 @@ def run_forever(self):
                 self.cur_task = cb
                 delay = 0
                 try:
-                    if args is ():
-                        ret = next(cb)
-                    else:
-                        ret = cb.send(*args)
+                    ret = next(cb) if args is () else cb.send(*args)
                     if __debug__ and DEBUG:
                         log.info("Coroutine %s yield result: %s", cb, ret)
                     if isinstance(ret, SysCall1):
@@ -168,8 +165,7 @@ def run_forever(self):
                     tnow = self.time()
                     t = self.waitq.peektime()
                     delay = time.ticks_diff(t, tnow)
-                    if delay < 0:
-                        delay = 0
+                    delay = max(delay, 0)
             self.wait(delay)
 
     def run_until_complete(self, coro):
diff --git a/src/modules/python/ulogging.py b/src/modules/python/ulogging.py
index cea2de0..98cbaf1 100644
--- a/src/modules/python/ulogging.py
+++ b/src/modules/python/ulogging.py
@@ -26,9 +26,7 @@ def __init__(self, name):
 
     def _level_str(self, level):
         l = _level_dict.get(level)
-        if l is not None:
-            return l
-        return "LVL%s" % level
+        return l if l is not None else f"LVL{level}"
 
     def setLevel(self, level):
         self.level = level
@@ -38,7 +36,7 @@ def isEnabledFor(self, level):
 
     def log(self, level, msg, *args):
         if level >= (self.level or _level):
-            _stream.write("%s:%s:" % (self._level_str(level), self.name))
+            _stream.write(f"{self._level_str(level)}:{self.name}:")
             if not args:
                 print(msg, file=_stream)
             else:
diff --git a/src/modules/python/utemplate/compiled.py b/src/modules/python/utemplate/compiled.py
index 82237a4..7465e34 100644
--- a/src/modules/python/utemplate/compiled.py
+++ b/src/modules/python/utemplate/compiled.py
@@ -1,12 +1,9 @@
 class Loader:
 
     def __init__(self, pkg, dir):
-        if dir == ".":
-            dir = ""
-        else:
-            dir = dir.replace("/", ".") + "."
+        dir = "" if dir == "." else dir.replace("/", ".") + "."
         if pkg and pkg != "__main__":
-            dir = pkg + "." + dir
+            dir = f"{pkg}.{dir}"
         self.p = dir
 
     def load(self, name):
diff --git a/src/modules/python/utemplate/source.py b/src/modules/python/utemplate/source.py
index a9948a1..a0761be 100644
--- a/src/modules/python/utemplate/source.py
+++ b/src/modules/python/utemplate/source.py
@@ -47,15 +47,12 @@ def close_literal(self):
 
     def render_expr(self, e):
         self.indent()
-        self.file_out.write('yield str(' + e + ')\n')
+        self.file_out.write(f'yield str({e}' + ')\n')
 
     def parse_statement(self, stmt):
         tokens = stmt.split(None, 1)
         if tokens[0] == "args":
-            if len(tokens) > 1:
-                self.args = tokens[1]
-            else:
-                self.args = ""
+            self.args = tokens[1] if len(tokens) > 1 else ""
         elif tokens[0] == "set":
             self.indent()
             self.file_out.write(stmt[3:].strip() + "\n")
@@ -64,9 +61,7 @@ def parse_statement(self, stmt):
                 # If there was no other output, we still need a header now
                 self.indent()
             tokens = tokens[1].split(None, 1)
-            args = ""
-            if len(tokens) > 1:
-                args = tokens[1]
+            args = tokens[1] if len(tokens) > 1 else ""
             if tokens[0][0] == "{":
                 self.indent()
                 # "1" as fromlist param is uPy hack
@@ -91,16 +86,15 @@ def parse_statement(self, stmt):
                 self.indent()
                 self.file_out.write(stmt + ":\n")
                 self.stack.append(tokens[0])
+        elif stmt.startswith("end"):
+            assert self.stack[-1] == stmt[3:]
+            self.stack.pop(-1)
+        elif stmt == "else":
+            assert self.stack[-1] == "if"
+            self.indent(-1)
+            self.file_out.write("else:\n")
         else:
-            if stmt.startswith("end"):
-                assert self.stack[-1] == stmt[3:]
-                self.stack.pop(-1)
-            elif stmt == "else":
-                assert self.stack[-1] == "if"
-                self.indent(-1)
-                self.file_out.write("else:\n")
-            else:
-                assert False
+            assert False
 
     def parse_line(self, l):
         while l:
@@ -158,12 +152,7 @@ def __init__(self, pkg, dir):
         self.pkg_path = ""
         if pkg:
             p = __import__(pkg)
-            if isinstance(p.__path__, str):
-                # uPy
-                self.pkg_path = p.__path__
-            else:
-                # CPy
-                self.pkg_path = p.__path__[0]
+            self.pkg_path = p.__path__ if isinstance(p.__path__, str) else p.__path__[0]
             self.pkg_path += "/"
 
     def input_open(self, template):
@@ -171,7 +160,7 @@ def input_open(self, template):
         return open(path)
 
     def compiled_path(self, template):
-        return self.dir + "/" + template.replace(".", "_") + ".py"
+        return f"{self.dir}/" + template.replace(".", "_") + ".py"
 
     def load(self, name):
         try:
@@ -182,9 +171,8 @@ def load(self, name):
         compiled_path = self.pkg_path + self.compiled_path(name)
 
         f_in = self.input_open(name)
-        f_out = open(compiled_path, "w")
-        c = Compiler(f_in, f_out, loader=self)
-        c.compile()
-        f_in.close()
-        f_out.close()
+        with open(compiled_path, "w") as f_out:
+            c = Compiler(f_in, f_out, loader=self)
+            c.compile()
+            f_in.close()
         return super().load(name)