SCR106: bare-except

except: without an exception type

Code	SCR106
Name	bare-except
Category	Scripts (SCR)
Default severity	warning
Enabled by default	yes
Fix available	no
ign-lint equivalent	none

What it does

Reports except: clauses without an exception type, unless the handler re-raises (a bare raise directly in its body).

Why is this bad?

A bare except: catches everything: SystemExit, KeyboardInterrupt, GeneratorExit and, in Jython, Java exceptions too. It hides programming errors such as a misspelled name (NameError) along with the failure it was meant for.

Note that in Jython except Exception: does not catch Java exceptions (java.lang.NullPointerException, SQL exceptions from system.db.*). Name both when that is the intent:

from java.lang import Throwable

try:
    system.db.runPrepUpdate(query, args)
except (Exception, Throwable), e:
    logger.error("update failed: %s" % e)

Example

try:
    value = float(payload["value"])
except:
    value = 0.0

Use instead:

try:
    value = float(payload["value"])
except (KeyError, TypeError, ValueError):
    value = 0.0

pylint

Corresponds to W0702 bare-except (pylint also reports handlers that re-raise).

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Generated from the rule metadata by iglint generate-docs; iglint rule SCR106 prints the same page in the terminal. Source: docs/rules/SCR106.md.