From e19f5158f45f32ecd2444989bbf98ba7f441dd53 Mon Sep 17 00:00:00 2001
From: Timm Fitschen <t.fitschen@indiscale.com>
Date: Thu, 16 Jul 2020 16:37:53 +0200
Subject: [PATCH] Removed [] as parameter defaults

---
 src/caosadvancedtools/table_importer.py | 13 ++++++-------
 1 file changed, 6 insertions(+), 7 deletions(-)

diff --git a/src/caosadvancedtools/table_importer.py b/src/caosadvancedtools/table_importer.py
index c859f675..2f9f1409 100755
--- a/src/caosadvancedtools/table_importer.py
+++ b/src/caosadvancedtools/table_importer.py
@@ -48,7 +48,8 @@ def yes_no_converter(val):
 
 
 class XLS_Importer(object):
-    def __init__(self, converters, obligatory_columns=[], unique_columns=[]):
+
+    def __init__(self, converters, obligatory_columns=None, unique_columns=None):
         """
 
         converters: dict with column names as keys and converter functions as
@@ -63,8 +64,8 @@ class XLS_Importer(object):
         """
         self.sup = Suppressable(logger=logger)
         self.required_columns = list(converters.keys())
-        self.obligatory_columns = obligatory_columns
-        self.unique_columns = unique_columns
+        self.obligatory_columns = [] if obligatory_columns is None else obligatory_columns
+        self.unique_columns = [] if unique_columns is None else unique_columns
         self.converters = converters
 
     def read_xls(self, filename):
@@ -72,10 +73,8 @@ class XLS_Importer(object):
 
         if len(xls_file .sheet_names) > 1:
             # Multiple sheets is the default now. Only show in debug
-            logger.debug("Excel file {} contains multiple sheets. "
-                         "All but the first are being ignored.".format(
-                             filename
-                         ))
+            logger.debug("Excel file %s contains multiple sheets. "
+                         "All but the first are being ignored.", filename)
 
         df = xls_file.parse(converters=self.converters)
         self.check_columns(df, filename=filename)
-- 
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