ci/lint: add python linting

Enabled the ruff python linter in CI, and resolved the issues that were
detected by it. Ruff was used due to it's faster checking compared with
other linters like pylint. This was added to resolve the python linting
request in mpv-player#13608.

.github/workflows/lint.yml

@@ -33,3 +33,9 @@ jobs:
     steps:
       - uses: actions/checkout@v4
       - uses: lunarmodules/luacheck@v1
+
+  python-lint:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+      - uses: chartboost/ruff-action@v1

TOOLS/docutils-wrapper.py

@@ -58,7 +58,7 @@ def remove(path):
     proc = subprocess.run(argv, check=True)
     if depfile is not None:
         convert_depfile(output, depfile)
-except:
+except Exception:
     remove(output)
     if depfile is not None:
         remove(depfile)

TOOLS/dylib_unhell.py

@@ -16,13 +16,13 @@ def is_user_lib(objfile, libname):
     return not sys_re.match(libname) and \
            not usr_re.match(libname) and \
            not exe_re.match(libname) and \
-           not "libobjc." in libname and \
-           not "libSystem." in libname and \
-           not "libc." in libname and \
-           not "libgcc." in libname and \
+           "libobjc." not in libname and \
+           "libSystem." not in libname and \
+           "libc." not in libname and \
+           "libgcc." not in libname and \
            not os.path.basename(libname) == 'Python' and \
-           not os.path.basename(objfile) in libname and \
-           not "libswift" in libname
+           os.path.basename(objfile) not in libname and \
+           "libswift" not in libname
 
 def otool(objfile, rapths):
     command = "otool -L '%s' | grep -e '\t' | awk '{ print $1 }'" % objfile
@@ -46,7 +46,7 @@ def get_rapths(objfile):
 
     try:
         result = subprocess.check_output(command, shell = True, universal_newlines=True)
-    except:
+    except Exception:
         return rpaths
 
     for line in result.splitlines():
@@ -90,17 +90,17 @@ def resolve_lib_path(objfile, lib, rapths):
 
 def check_vulkan_max_version(version):
     try:
-        result = subprocess.check_output("pkg-config vulkan --max-version=" + version, shell = True)
+        subprocess.check_output("pkg-config vulkan --max-version=" + version, shell = True)
         return True
-    except:
+    except Exception:
         return False
 
 def get_homebrew_prefix():
     # set default to standard ARM path, intel path is already in the vulkan loader search array
     result = "/opt/homebrew"
     try:
         result = subprocess.check_output("brew --prefix", universal_newlines=True, shell=True, stderr=subprocess.DEVNULL).strip()
-    except:
+    except Exception:
         pass
 
     return result

TOOLS/macos-sdk-version.py

@@ -3,9 +3,7 @@
 # This checks for the sdk path, the sdk version, and
 # the sdk build version.
 
-import re
 import os
-import string
 import subprocess
 import sys
 from shutil import which
@@ -33,7 +31,7 @@ def find_macos_sdk():
         try:
             sdk_version = check_output([xcodebuild, '-sdk', 'macosx', '-version', 'ProductVersion'],
                                         encoding="UTF-8", stderr=subprocess.DEVNULL)
-        except:
+        except Exception:
             pass
 
     if not isinstance(sdk_version, str):

TOOLS/matroska.py

@@ -4,6 +4,10 @@
 Can also be used to directly parse Matroska files and display their contents.
 """
 
+import sys
+from math import ldexp
+from binascii import hexlify
+
 #
 # This file is part of mpv.
 #
@@ -242,14 +246,11 @@
 )
 
 
-import sys
-from math import ldexp
-from binascii import hexlify
-
 def byte2num(s):
     return int(hexlify(s), 16)
 
-class EOF(Exception): pass
+class EOF(Exception):
+    pass
 
 def camelcase_to_words(name):
     parts = []
@@ -291,9 +292,9 @@ def add_subelements(self, subelements):
 
 elementd = {}
 elementlist = []
-def parse_elems(l, namespace):
+def parse_elems(elements, namespace):
     subelements = []
-    for el in l:
+    for el in elements:
         if isinstance(el, str):
             name, hexid, eltype = [x.strip() for x in el.split(',')]
             hexid = hexid.lower()
@@ -328,10 +329,10 @@ def generate_C_header(out):
             continue
         printf(out)
         printf(out, 'struct {0.structname} {{'.format(el))
-        l = max(len(subel.valname) for subel, multiple in el.subelements)+1
+        length = max(len(subel.valname) for subel, multiple in el.subelements)+1
         for subel, multiple in el.subelements:
-            printf(out, '    {e.valname:{l}} {star}{e.fieldname};'.format(
-                        e=subel, l=l, star=' *'[multiple]))
+            printf(out, '    {e.valname:{length}} {star}{e.fieldname};'.format(
+                        e=subel, length=length, star=' *'[multiple]))
         printf(out)
         for subel, multiple in el.subelements:
             printf(out, '    int  n_{0.fieldname};'.format(subel))

TOOLS/stats-conv.py

@@ -161,7 +161,7 @@ def mkColor(t):
 
 for e in G.sevents:
     cur = ax[1 if e.type == "value" else 0]
-    if not cur in G.curveno:
+    if cur not in G.curveno:
         G.curveno[cur] = 0
     args = {'name': e.name,'antialias':True}
     color = mkColor(colors[G.curveno[cur] % len(colors)])

ci/lint-commit-msg.py

@@ -1,5 +1,9 @@
 #!/usr/bin/env python3
-import os, sys, json, subprocess, re
+import os
+import sys
+import json
+import subprocess
+import re
 from typing import Dict, Tuple, Callable, Optional
 
 def call(cmd) -> str: