diff --git a/test/core_test.py b/test/core_test.py
index 0b453b7..dc3d648 100644
--- a/test/core_test.py
+++ b/test/core_test.py
@@ -62,7 +62,8 @@ def test_set_status_message(self):
 
             tox.status_message = b"x" * core.MAX_STATUS_MESSAGE_LENGTH
             with self.assertRaises(error.ApiException):
-                tox.status_message = b"x" * (core.MAX_STATUS_MESSAGE_LENGTH + 1)
+                tox.status_message = b"x" * (core.MAX_STATUS_MESSAGE_LENGTH +
+                                             1)
 
     def test_set_status(self):
         with core.Core() as tox:
diff --git a/tools/gen_api.py b/tools/gen_api.py
index 2dce4b0..893ae4b 100755
--- a/tools/gen_api.py
+++ b/tools/gen_api.py
@@ -37,7 +37,7 @@ def needs_space(l: str, r: str) -> bool:
 def untokenize(tokens: Tuple[str, ...]) -> str:
     line = []
     for i in range(len(tokens) - 1):
-        if tokens[i : i + 2] == ("void", ")"):
+        if tokens[i:i + 2] == ("void", ")"):
             break
         line.append(tokens[i])
         if needs_space(tokens[i], tokens[i + 1]):
@@ -74,9 +74,8 @@ def parse_params(tokens: Tuple[str, ...]) -> List[Tuple[List[str], str]]:
     return params
 
 
-def finalize_handler(
-    type_prefix: str, handlers: List[str], event: str, params: List[str]
-) -> None:
+def finalize_handler(type_prefix: str, handlers: List[str], event: str,
+                     params: List[str]) -> None:
     # handlers[-1] += " noexcept"
     handlers[-1] += ":"
     self = ""
@@ -134,9 +133,8 @@ def handle_macro(tokens: Sequence[str], state: List[str]) -> bool:
     return False
 
 
-def handle_types(
-    tokens: Sequence[str], state: List[str], extern: List[str], const_prefix: str
-) -> bool:
+def handle_types(tokens: Sequence[str], state: List[str], extern: List[str],
+                 const_prefix: str) -> bool:
     # struct definitions (members are ignored)
     if tokens[0] == "struct" and tokens[-1] == "{":
         state.append("struct")
@@ -148,7 +146,8 @@ def handle_types(
         extern.append(f"    ctypedef struct {tokens[2]}")
 
     # enums
-    if (tokens[:2] == ("typedef", "enum") or tokens[0] == "enum") and tokens[-1] == "{":
+    if (tokens[:2] == ("typedef", "enum")
+            or tokens[0] == "enum") and tokens[-1] == "{":
         enum_name = tokens[-2]
         if enum_name != "Tox_Log_Level":
             extern.append("")
@@ -163,23 +162,20 @@ def handle_types(
 
 
 def handle_functions(
-    tokens: Tuple[str, ...],
-    state: List[str],
-    extern: List[str],
-    fun_prefix: str,
-    type_prefix: str,
-    event: str,
-    params: List[str],
-    handlers: List[str],
-    install_handlers: List[str],
+        tokens: Tuple[str, ...],
+        state: List[str],
+        extern: List[str],
+        fun_prefix: str,
+        type_prefix: str,
+        event: str,
+        params: List[str],
+        handlers: List[str],
+        install_handlers: List[str],
 ) -> str:
     # functions and callbacks
-    if (
-        "(" in tokens
-        and tokens[0].isidentifier()
-        and token_before("(", tokens).startswith(fun_prefix)
-        and tokens[0] != "typedef"
-    ):
+    if ("(" in tokens and tokens[0].isidentifier()
+            and token_before("(", tokens).startswith(fun_prefix)
+            and tokens[0] != "typedef"):
         extern.append(f"    cdef {untokenize_fun(tokens)}")
         if ";" not in tokens:
             state.append("fun")
@@ -187,17 +183,17 @@ def handle_functions(
     if tokens[:2] == ("typedef", "void"):
         extern.append(f"    c{untokenize_fun(tokens)}")
 
-        event = tokens[2][len(fun_prefix) : -3]
+        event = tokens[2][len(fun_prefix):-3]
         params.clear()
         params.extend(tokens[3:])
 
         # TODO(iphydf): Handle this better (by checking whether we have a callback install
         # function for this event).
         if event != "log":
-            handlers.append(f"cdef void handle_{untokenize_fun((event,) + tokens[3:])}")
+            handlers.append(
+                f"cdef void handle_{untokenize_fun((event,) + tokens[3:])}")
             install_handlers.append(
-                f"    {fun_prefix}callback_{event}(ptr, handle_{event})"
-            )
+                f"    {fun_prefix}callback_{event}(ptr, handle_{event})")
         if ";" not in tokens:
             state.append("callback")
         else:
@@ -222,7 +218,8 @@ def handle_functions(
     return event
 
 
-def gen_cython(lines: Sequence[str], fun_prefix: str, extern_line: str) -> List[str]:
+def gen_cython(lines: Sequence[str], fun_prefix: str,
+               extern_line: str) -> List[str]:
     const_prefix = fun_prefix.upper()
     type_prefix = fun_prefix.capitalize()
 
@@ -282,7 +279,8 @@ def gen_cython(lines: Sequence[str], fun_prefix: str, extern_line: str) -> List[
         )
 
     if install_handlers:
-        install_handlers = ["cdef void install_handlers(Tox *ptr):"] + install_handlers
+        install_handlers = ["cdef void install_handlers(Tox *ptr):"
+                            ] + install_handlers
     return extern + [""] + handlers + [""] + install_handlers
 
 
@@ -300,23 +298,18 @@ def main() -> None:
     with open(src, "r", encoding="utf-8") as src_fh:
         for line in src_fh.readlines():
             if line.startswith(cdef_extern_prefix) and line.endswith(
-                cdef_extern_suffix
-            ):
+                    cdef_extern_suffix):
                 api_file = line.removeprefix(cdef_extern_prefix).removesuffix(
-                    cdef_extern_suffix
-                )
+                    cdef_extern_suffix)
                 api = os.path.join(api_base, api_file)
                 extern_line = line.removesuffix(" pass\n")
                 with open(api, "r", encoding="utf-8") as api_fh:
-                    print(
-                        "\n".join(
-                            gen_cython(
-                                api_fh.readlines(),
-                                fun_prefix=get_fun_prefix(api),
-                                extern_line=extern_line,
-                            )
-                        )
-                    )
+                    print("\n".join(
+                        gen_cython(
+                            api_fh.readlines(),
+                            fun_prefix=get_fun_prefix(api),
+                            extern_line=extern_line,
+                        )))
             else:
                 print(line.rstrip())