Fix a crash from astroid.InferenceError raised on copy.copy
Closes #4891
diff --git a/ChangeLog b/ChangeLog
index 49fc5d9..832f4b6 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -22,6 +22,12 @@
Closes #4886
+* Fix a crash in the checker raising ``shallow-copy-environ`` when failing to infer
+ on ``copy.copy``
+
+ Closes #4896
+
+
What's New in Pylint 2.10.1?
============================
diff --git a/pylint/checkers/stdlib.py b/pylint/checkers/stdlib.py
index cffc8a4..b7a6e03 100644
--- a/pylint/checkers/stdlib.py
+++ b/pylint/checkers/stdlib.py
@@ -483,9 +483,13 @@
if "check" not in kwargs:
self.add_message("subprocess-run-check", node=node)
- def _check_shallow_copy_environ(self, node):
+ def _check_shallow_copy_environ(self, node: nodes.Call) -> None:
arg = utils.get_argument_from_call(node, position=0)
- for inferred in arg.inferred():
+ try:
+ inferred_args = arg.inferred()
+ except astroid.InferenceError:
+ return
+ for inferred in inferred_args:
if inferred.qname() == OS_ENVIRON:
self.add_message("shallow-copy-environ", node=node)
break
@@ -505,7 +509,7 @@
"unspecified-encoding",
"forgotten-debug-statement",
)
- def visit_call(self, node):
+ def visit_call(self, node: nodes.Call) -> None:
"""Visit a Call node."""
self.check_deprecated_class_in_call(node)
for inferred in utils.infer_all(node.func):
diff --git a/tests/functional/r/regression/regression_4891.py b/tests/functional/r/regression/regression_4891.py
new file mode 100644
index 0000000..34945e8
--- /dev/null
+++ b/tests/functional/r/regression/regression_4891.py
@@ -0,0 +1,16 @@
+# pylint: disable=missing-module-docstring
+# pylint: disable=too-few-public-methods
+import copy
+
+class MyData:
+ '''
+ class docstring
+ '''
+ def __init__(self):
+ self.data = {}
+
+ def process(self):
+ '''
+ another method is responsible for putting "static_key"
+ '''
+ copy.copy(self.data['static_key'])
