Merge pull request #1482 from rgant/pipenv-str-cmds

Handle str cmd in ask_pipenv

lint/base_linter/python_linter.py

@@ -77,7 +77,7 @@ def context_sensitive_executable_path(self, cmd):
         # If we're here the user didn't specify anything. This is the default
         # experience. So we kick in some 'magic'
         cwd = self.get_working_dir(settings)
-        executable = ask_pipenv(cmd[0], cwd)
+        executable = ask_pipenv(cmd_name, cwd)
         if executable:
             logger.info(
                 "{}: Using {} according to 'pipenv'"