Legacy __print__ statements are syntax errors in Python 3 but __print()__ function works as expected in both Python 2 and Python 3.
[flake8](http://flake8.pycqa.org) testing of https://github.com/Neo23x0/sigma on Python 3.7.1
$ __flake8 . --count --select=E9,F63,F72,F82 --show-source --statistics__
```
./contrib/sigma2sumologic.py:123:5: F821 undefined name 'parser_print_help'
parser_print_help()
^
./contrib/sigma2sumologic.py:211:32: F821 undefined name 'r'
f.write(json.dumps(r, indent=4, sort_keys=True) + " ERROR: %s\n\nQUERY: %s" % (e, sumo_query))
^
./contrib/sigma2elastalert.py:165:32: E999 SyntaxError: invalid syntax
print "Converting file " + file
^
./tools/sigma/parser/collection.py:52:27: F821 undefined name 'SigmaCollectionParseError'
raise SigmaCollectionParseError("action 'repeat' is only applicable after first valid Sigma rule")
^
1 E999 SyntaxError: invalid syntax
3 F821 undefined name 'parser_print_help'
4
```
__E901,E999,F821,F822,F823__ are the "_showstopper_" [flake8](http://flake8.pycqa.org) issues that can halt the runtime with a SyntaxError, NameError, etc. These 5 are different from most other flake8 issues which are merely "style violations" -- useful for readability but they do not effect runtime safety.
* F821: undefined name `name`
* F822: undefined name `name` in `__all__`
* F823: local variable name referenced before assignment
* E901: SyntaxError or IndentationError
* E999: SyntaxError -- failed to compile a file into an Abstract Syntax Tree
