From e81c96c27ee794a980ac8bc1710b3d8a179cdadf Mon Sep 17 00:00:00 2001
From: Simon Hawkins <simonjayhawkins@gmail.com>
Date: Thu, 3 Sep 2020 13:14:19 +0100
Subject: [PATCH] STY: add code check for use of builtin filter function

---
 ci/code_checks.sh | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/ci/code_checks.sh b/ci/code_checks.sh
index 852f66763683b..35c4b284599a1 100755
--- a/ci/code_checks.sh
+++ b/ci/code_checks.sh
@@ -179,6 +179,10 @@ if [[ -z "$CHECK" || "$CHECK" == "patterns" ]]; then
     invgrep -R --include="*.py" -E "super\(\w*, (self|cls)\)" pandas
     RET=$(($RET + $?)) ; echo $MSG "DONE"
 
+    MSG='Check for use of builtin filter function' ; echo $MSG
+    invgrep -R --include="*.py" -P '(?<!def)[\(\s]filter\(' pandas
+    RET=$(($RET + $?)) ; echo $MSG "DONE"
+
     # Check for the following code in testing: `np.testing` and `np.array_equal`
     MSG='Check for invalid testing' ; echo $MSG
     invgrep -r -E --include '*.py' --exclude testing.py '(numpy|np)(\.testing|\.array_equal)' pandas/tests/