commit fce37ec3d0511156d5869107c9880362edec62d7
author Nikita Sobolev <mail@sobolevn.me> Wed Mar 22 22:53:52 2023 +0300
committer GitHub <noreply@github.com> Wed Mar 22 22:53:52 2023 +0300
tree a81d80696461e94a1e952f36e20e39015593e3a4
parent 835a5400881b7460998be51d871fd36f836db3c9

Improve error message on 0 arguments

Closes #104

mccabe.py

diff --git a/mccabe.py b/mccabe.py
index 5746504..302ac6d 100644
--- a/mccabe.py
+++ b/mccabe.py
@@ -323,6 +323,9 @@
                     default=1)
 
     options, args = opar.parse_args(argv)
+    if not args:
+        opar.print_help()
+        opar.exit()
 
     code = _read(args[0])
     tree = compile(code, args[0], "exec", ast.PyCF_ONLY_AST)