Keep "self._print()" from printing during multithreaded runs

Author: mdmintz

seleniumbase/fixtures/base_case.py

@@ -4865,8 +4865,16 @@ def block_ads(self):
         self.ad_block()
 
     def _print(self, msg):
-        """ Same as Python's print() """
-        print(msg)
+        """Same as Python's print(), but won't print during multithreaded runs
+        because overlapping print() commands may lead to unexpected output.
+        In most cases, the print() command won't print for multithreaded tests,
+        but there are some exceptions, and this will take care of those.
+        Here's an example of running tests multithreaded: "pytest -n=4".
+        To force a print during multithreaded tests, use: "sys.stderr.write()".
+        To print without the new-line character end, use: "sys.stdout.write()".
+        """
+        if not sb_config._multithreaded:
+            print(msg)
 
     def start_tour(self, name=None, interval=0):
         self.play_tour(name=name, interval=interval)