diff --git a/contrib/apple-sdk-tools/extract_xcode.py b/contrib/apple-sdk-tools/extract_xcode.py
--- a/contrib/apple-sdk-tools/extract_xcode.py
+++ b/contrib/apple-sdk-tools/extract_xcode.py
@@ -34,10 +34,10 @@
     def __exit__(self, exc_type, exc_val, exc_tb):
         if self.filename != '-':
             self.fh.close()
-    def write(self, bytes):
+    def write(self, b):
         if self.filename != '-':
-            return self.fh.write(bytes)
-        return self.fh.buffer.write(bytes)
+            return self.fh.write(b)
+        return self.fh.buffer.write(b)
     def read(self, size):
         if self.filename != '-':
             return self.fh.read(size)
@@ -62,13 +62,13 @@
             print("bad xar magic", file=sys.stderr)
             sys.exit(1)
 
-        bytes = infile.read(24)
-        header_size, xar_version, toc_compressed, toc_uncompressed, checksum_type = struct.unpack('>HHQQI', bytes)
+        in_bytes = infile.read(24)
+        header_size, xar_version, toc_compressed, toc_uncompressed, checksum_type = struct.unpack('>HHQQI', in_bytes)
         start_offset += header_size
         start_offset += toc_compressed
-        bytes = infile.read(toc_compressed)
+        in_bytes = infile.read(toc_compressed)
 
-        xml_toc = zlib.decompress(bytes).decode("utf-8") 
+        xml_toc = zlib.decompress(in_bytes).decode("utf-8")
 
         root = ET.fromstring(xml_toc)
 
@@ -102,28 +102,28 @@
             print("bad pbzx magic", file=sys.stderr)
             sys.exit(2)
 
-        bytes = infile.read(8)
+        in_bytes = infile.read(8)
         content_read_size += 8
-        flags, = struct.unpack('>Q', bytes)
-        bytes = infile.read(16)
+        flags, = struct.unpack('>Q', in_bytes)
+        in_bytes = infile.read(16)
         content_read_size += 16
         while (flags & 1 << 24):
-            flags, size = struct.unpack('>QQ', bytes)
-            bytes = infile.read(size)
+            flags, size = struct.unpack('>QQ', in_bytes)
+            in_bytes = infile.read(size)
             content_read_size += size
             compressed = size != 1 << 24
             if compressed:
-                if bytes[0:6] != LZMA_MAGIC:
+                if in_bytes[0:6] != LZMA_MAGIC:
                     print("bad lzma magic: ", file=sys.stderr)
                     sys.exit(3)
-                outfile.write(lzma.decompress(bytes))
+                outfile.write(lzma.decompress(in_bytes))
             else:
-                outfile.write(bytes)
+                outfile.write(in_bytes)
 
             if content_read_size == content_length:
                 break
-                
-            bytes = infile.read(16)
+
+            in_bytes = infile.read(16)
             content_read_size += 16
 
 if __name__ == '__main__':
diff --git a/contrib/macdeploy/macdeployqtplus.py b/contrib/macdeploy/macdeployqtplus.py
--- a/contrib/macdeploy/macdeployqtplus.py
+++ b/contrib/macdeploy/macdeployqtplus.py
@@ -262,12 +262,12 @@
     runInstallNameTool("change", oldName, newName, binaryPath)
 
 
-def changeIdentification(id: str, binaryPath: str, verbose: int):
+def changeIdentification(id_name: str, binaryPath: str, verbose: int):
     if verbose >= 3:
         print("Using install_name_tool:")
         print(" change identification in", binaryPath)
-        print(" to", id)
-    runInstallNameTool("id", id, binaryPath)
+        print(" to", id_name)
+    runInstallNameTool("id", id_name, binaryPath)
 
 
 def runStrip(binaryPath: str, verbose: int):
diff --git a/contrib/tracing/p2p_monitor.py b/contrib/tracing/p2p_monitor.py
--- a/contrib/tracing/p2p_monitor.py
+++ b/contrib/tracing/p2p_monitor.py
@@ -96,8 +96,8 @@
     total_outbound_msgs = 0
     total_outbound_bytes = 0
 
-    def __init__(self, id, address, connection_type):
-        self.id = id
+    def __init__(self, peer_id, address, connection_type):
+        self.id = peer_id
         self.address = address
         self.connection_type = connection_type
         self.last_messages = []