diff --git a/pddl/__init__.py b/pddl/__init__.py
index 3a86d6b..ac20961 100644
--- a/pddl/__init__.py
+++ b/pddl/__init__.py
@@ -30,12 +30,15 @@
 # Simple helpers
 def parse_domain(fn):
     from pddl.parser.domain import DomainParser
-    with open(fn, 'r') as f:
+
+    with open(fn, "r") as f:
         dtext = f.read()
     return DomainParser()(dtext)
 
+
 def parse_problem(fn):
     from pddl.parser.problem import ProblemParser
-    with open(fn, 'r') as f:
+
+    with open(fn, "r") as f:
         ptext = f.read()
     return ProblemParser()(ptext)
diff --git a/pddl/__version__.py b/pddl/__version__.py
index 999f5e5..10e2e72 100644
--- a/pddl/__version__.py
+++ b/pddl/__version__.py
@@ -18,6 +18,8 @@
 __url__ = "https://github.com/AI-Planning/pddl.git"
 __version__ = "0.2.0"
 __author__ = "Marco Favorito, Francesco Fuggitti"
-__author_email__ = "marco.favorito@gmail.com, fuggitti@diag.uniroma1.it, christian.muise@queensu.ca"
+__author_email__ = (
+    "marco.favorito@gmail.com, fuggitti@diag.uniroma1.it, christian.muise@queensu.ca"
+)
 __license__ = "MIT License"
 __copyright__ = "2021-2022 WhiteMech"