diff --git a/pyglossary/core.py b/pyglossary/core.py
index 81af6795c..8261bd673 100644
--- a/pyglossary/core.py
+++ b/pyglossary/core.py
@@ -279,9 +279,7 @@ def checkCreateConfDir() -> None:
 def _in_virtualenv() -> bool:
 	if hasattr(sys, "real_prefix"):
 		return True
-	if hasattr(sys, "base_prefix") and sys.base_prefix != sys.prefix:
-		return True
-	return False
+	return hasattr(sys, "base_prefix") and sys.base_prefix != sys.prefix
 
 
 def getDataDir() -> str:
diff --git a/pyglossary/glossary.py b/pyglossary/glossary.py
index 4f9962bbd..1b683a2e4 100644
--- a/pyglossary/glossary.py
+++ b/pyglossary/glossary.py
@@ -82,16 +82,12 @@ def read(
 
 		self._progressbar = progressbar
 
-		ok = self._read(
+		return self._read(
 			filename=filename,
 			format=format,
 			direct=direct,
 			**kwargs,
 		)
-		if not ok:
-			return False
-
-		return True
 
 	def addEntryObj(self, entry: "EntryType") -> None:
 		self._data.append(entry)
diff --git a/pyglossary/option.py b/pyglossary/option.py
index c569ab2ef..be671cc95 100644
--- a/pyglossary/option.py
+++ b/pyglossary/option.py
@@ -127,9 +127,7 @@ def validateRaw(self, raw: str) -> bool:
 		value, isValid = self.evaluate(raw)
 		if not isValid:
 			return False
-		if not self.validate(value):
-			return False
-		return True
+		return self.validate(value)
 
 	def groupValues(self) -> "dict[str, Any] | None":  # noqa: PLR6301
 		return None
diff --git a/pyglossary/plugins/stardict.py b/pyglossary/plugins/stardict.py
index 1ce711333..f88d89c86 100644
--- a/pyglossary/plugins/stardict.py
+++ b/pyglossary/plugins/stardict.py
@@ -157,9 +157,7 @@ def verifySameTypeSequence(s: str) -> bool:
 	# maybe should just check it's in ("h", "m", "x")
 	if not s.isalpha():
 		return False
-	if len(s) > 1:
-		return False
-	return True
+	return len(s) == 1
 
 
 class XdxfTransformerType(Protocol):
diff --git a/pyglossary/plugins/stardict_textual.py b/pyglossary/plugins/stardict_textual.py
index 09a880675..042c0f63d 100644
--- a/pyglossary/plugins/stardict_textual.py
+++ b/pyglossary/plugins/stardict_textual.py
@@ -173,8 +173,7 @@ def renderDefiList(
 			return defisWithFormat[0]
 
 		defiFormatSet = set()
-		for _, _type in defisWithFormat:
-			defiFormatSet.add(_type)
+		defiFormatSet.update(_type for _, _type in defisWithFormat)
 
 		if len(defiFormatSet) == 1:
 			defis = [_defi for _defi, _ in defisWithFormat]
diff --git a/pyglossary/ui/main.py b/pyglossary/ui/main.py
index 62522482a..214e3af54 100644
--- a/pyglossary/ui/main.py
+++ b/pyglossary/ui/main.py
@@ -268,9 +268,7 @@ def shouldUseCMD(args: "argparse.Namespace") -> bool:
 		return True
 	if args.interactive:
 		return True
-	if args.inputFilename and args.outputFilename:
-		return True
-	return False
+	return bool(args.inputFilename and args.outputFilename)
 
 
 def getRunner(args: "argparse.Namespace", ui_type: str) -> "Callable":
diff --git a/pyglossary/xdxf/transform.py b/pyglossary/xdxf/transform.py
index 1eb46d581..81c424805 100644
--- a/pyglossary/xdxf/transform.py
+++ b/pyglossary/xdxf/transform.py
@@ -91,7 +91,7 @@ def hasPrevText(prev: "None | str | Element") -> bool:
 			"small",
 		}:
 			return True
-		if prev.text:
+		if prev.text:  # noqa: SIM103
 			return True
 		# print(prev)
 		return False
@@ -382,9 +382,7 @@ def shouldAddSep(  # noqa: PLR6301
 		prev: "str | Element",
 	) -> bool:
 		if isinstance(child, str):
-			if len(child) > 0 and child[0] in ".,;)":
-				return False
-			return True
+			return not (len(child) > 0 and child[0] in ".,;)")
 
 		if child.tag in {"sub", "sup"}:
 			return False
diff --git a/scripts/plugin-doc.py b/scripts/plugin-doc.py
index 3c110079f..8b653938c 100755
--- a/scripts/plugin-doc.py
+++ b/scripts/plugin-doc.py
@@ -177,9 +177,7 @@ def pluginIsActive(p):
 		return False
 	if not (p.canRead or p.canWrite):
 		return False
-	if userPluginsDirPath in p.path.parents:
-		return False
-	return True
+	return userPluginsDirPath not in p.path.parents
 
 
 def getToolSourceLink(tool):
diff --git a/scripts/wiki-formats.py b/scripts/wiki-formats.py
index a5c777be3..5a26dd848 100755
--- a/scripts/wiki-formats.py
+++ b/scripts/wiki-formats.py
@@ -59,9 +59,7 @@ def pluginIsActive(p):
 		return False
 	if not (p.canRead or p.canWrite):
 		return False
-	if userPluginsDirPath in p.path.parents:
-		return False
-	return True
+	return userPluginsDirPath not in p.path.parents
 
 
 def codeValue(x):