simplify if statements by using walrus operators (#7671)

gallery_dl/postprocessor/common.py

@@ -22,8 +22,7 @@ class PostProcessor():
         return self.__class__.__name__
 
     def _init_archive(self, job, options, prefix=None):
-        archive_path = options.get("archive")
-        if archive_path:
+        if archive_path := options.get("archive"):
             extr = job.extractor
 
             archive_table = options.get("archive-table")

gallery_dl/postprocessor/compare.py

@@ -21,8 +21,7 @@ class ComparePP(PostProcessor):
             self._compare = self._compare_size
         self._equal_exc = self._equal_cnt = 0
 
-        equal = options.get("equal")
-        if equal:
+        if equal := options.get("equal"):
             equal, _, emax = equal.partition(":")
             self._equal_max = text.parse_int(emax)
             if equal == "abort":

gallery_dl/postprocessor/metadata.py

@@ -55,8 +55,7 @@ class MetadataPP(PostProcessor):
             self._json_encode = self._make_encoder(options, 4).encode
             ext = "json"
 
-        base_directory = options.get("base-directory")
-        if base_directory:
+        if base_directory := options.get("base-directory"):
             if base_directory is True:
                 self._base = lambda p: p.basedirectory
             else:
@@ -181,8 +180,7 @@ class MetadataPP(PostProcessor):
         try:
             pathfmt.directory_formatters = self._directory_formatters
             pathfmt.directory_conditions = ()
-            segments = pathfmt.build_directory(pathfmt.kwdict)
-            if segments:
+            if segments := pathfmt.build_directory(pathfmt.kwdict):
                 directory = pathfmt.clean_path(os.sep.join(segments) + os.sep)
             else:
                 directory = "." + os.sep
@@ -244,8 +242,7 @@ class MetadataPP(PostProcessor):
         fp.write(self._json_encode(kwdict) + "\n")
 
     def _make_filter(self, options):
-        include = options.get("include")
-        if include:
+        if include := options.get("include"):
             if isinstance(include, str):
                 include = include.split(",")
             return lambda d: {k: d[k] for k in include if k in d}

gallery_dl/postprocessor/mtime.py

@@ -17,8 +17,7 @@ class MtimePP(PostProcessor):
 
     def __init__(self, job, options):
         PostProcessor.__init__(self, job)
-        value = options.get("value")
-        if value:
+        if value := options.get("value"):
             self._get = formatter.parse(value, None, util.identity).format_map
         else:
             key = options.get("key", "date")

gallery_dl/postprocessor/ugoira.py

@@ -296,8 +296,7 @@ class UgoiraPP(PostProcessor):
     def _exec(self, args):
         self.log.debug(args)
         out = None if self.output else subprocess.DEVNULL
-        retcode = util.Popen(args, stdout=out, stderr=out).wait()
-        if retcode:
+        if retcode := util.Popen(args, stdout=out, stderr=out).wait():
             output.stderr_write("\n")
             self.log.error("Non-zero exit status when running %s (%s)",
                            args, retcode)