Bad comparison parsing for constants

[areebbeigh]

Comparisons in jinja don't behave like comparisons in Python.

template = '''{{4 < 2 < 3}}
{{a < b < c}}'''
t = Template(template)
print(t.render(a = 4, b = 2, c = 3))

Expected output:

False
False

Output:

True
False

Python code:

4 < 2 < 3

Output: False

The problem lies in

jinja/jinja2/nodes.py

Lines 775 to 780 in 1af1205

	try:
	for op in self.ops:
	new_value = op.expr.as_const(eval_ctx)
	result = _cmpop_to_func[op.op](value, new_value)
	value = new_value
	except Exception:

where the result of the comparison depends only on the final operator result.

I would like to submit a PR for this.

• Python version: 3.6.7
• Jinja version: 2.10

[davidism]

I would like to submit a PR for this.

PRs welcome