warn about bare except clause

1 files changed, 20 insertions, 2 deletions

diff --git a/pycodestyle.py b/pycodestyle.py
index e308177..559048e 100755
--- a/pycodestyle.py
+++ b/pycodestyle.py
@@ -912,8 +912,10 @@ def module_imports_on_top_of_file(
     Okay: # this is a comment\nimport os
     Okay: '''this is a module docstring'''\nimport os
     Okay: r'''this is a module docstring'''\nimport os
-    Okay: try:\n    import x\nexcept:\n    pass\nelse:\n    pass\nimport y
-    Okay: try:\n    import x\nexcept:\n    pass\nfinally:\n    pass\nimport y
+    Okay:
+    try:\n\timport x\nexcept ImportError:\n\tpass\nelse:\n\tpass\nimport y
+    Okay:
+    try:\n\timport x\nexcept ImportError:\n\tpass\nfinally:\n\tpass\nimport y
     E402: a=1\nimport os
     E402: 'One string'\n"Two string"\nimport os
     E402: a=1\nfrom sys import x
@@ -1179,6 +1181,22 @@ def comparison_type(logical_line, noqa):
         yield match.start(), "E721 do not compare types, use 'isinstance()'"
 
 
+def bare_except(logical_line, noqa):
+    r"""When catching exceptions, mention specific exceptions whenever possible.
+
+    Okay: except Exception:
+    Okay: except BaseException:
+    E722: except:
+    """
+    if noqa:
+        return
+
+    regex = re.compile(r"except\s*:")
+    match = regex.match(logical_line)
+    if match:
+        yield match.start(), "E722 do not use bare except'"
+
+
 def ambiguous_identifier(logical_line, tokens):
     r"""Never use the characters 'l', 'O', or 'I' as variable names.