TypeError: cannot concatenate 'str' and 'int' objects

[clokep]

With flake8-builtins 1.3.0 and flake8 3.5.0, I'm getting the following error on Python 2.7:

Traceback (most recent call last):
  File "/home/ubuntu/virtualenvs/venv-system/bin/flake8", line 11, in <module>
    sys.exit(main())
  File "/home/ubuntu/virtualenvs/venv-system/local/lib/python2.7/site-packages/flake8/main/cli.py", line 16, in main
    app.run(argv)
  File "/home/ubuntu/virtualenvs/venv-system/local/lib/python2.7/site-packages/flake8/main/application.py", line 396, in run
    self._run(argv)
  File "/home/ubuntu/virtualenvs/venv-system/local/lib/python2.7/site-packages/flake8/main/application.py", line 385, in _run
    self.report()
  File "/home/ubuntu/virtualenvs/venv-system/local/lib/python2.7/site-packages/flake8/main/application.py", line 376, in report
    self.report_errors()
  File "/home/ubuntu/virtualenvs/venv-system/local/lib/python2.7/site-packages/flake8/main/application.py", line 340, in report_errors
    results = self.file_checker_manager.report()
  File "/home/ubuntu/virtualenvs/venv-system/local/lib/python2.7/site-packages/flake8/checker.py", line 267, in report
    results_reported += self._handle_results(filename, results)
  File "/home/ubuntu/virtualenvs/venv-system/local/lib/python2.7/site-packages/flake8/checker.py", line 166, in _handle_results
    physical_line=physical_line,
  File "/home/ubuntu/virtualenvs/venv-system/local/lib/python2.7/site-packages/flake8/style_guide.py", line 384, in handle_error
    error = Violation(code, filename, line_number, column_number + 1,
TypeError: cannot concatenate 'str' and 'int' objects

This seems to be while reporting the error? This seems new in 1.3.0, no error in 1.2.1.

[arnimarj]

I've run into the same issue. A debug session would indicate that the offending lines is in check_function_definition().

I updated check_function_definition() to be:

    def check_function_definition(self, statement):
        if statement.name in BUILTINS:
            msg = self.assign_msg
            if type(statement.__flake8_builtins_parent) is ast.ClassDef:
                msg = self.class_attribute_msg

            yield self.error(statement, message=msg, variable=statement.name)

        if sys.version_info >= (3, 0):
            for arg in statement.args.args:
                if isinstance(arg, ast.arg) and \
                        arg.arg in BUILTINS:
                    yield self.error(
                        arg,
                        message=self.argument_msg,
                        column=arg.col_offset,
                        variable=arg.arg,
                    )
        else:
            for arg in statement.args.args:
                if isinstance(arg, ast.Name) and \
                        arg.id in BUILTINS:
                    yield self.error(
                        arg,
                        message=self.argument_msg,
                        column=arg.col_offset,
                        variable=arg,
                    )

A small test case:

def func(self, format=None):
	pass

class obj(object):
	def func(self, format=None):
		pass