Get nested value from an object (Python 2.x and 3.x compatible)

get_nested_value.py

#!/usr/bin/env python
try:
	from functools import reduce
except ImportError:
	pass

# How to use
#   foo = { "a": "a1", "b": "a2", "c": { "d": "a3" } } 
#   bar = ["c", "d"]
#   nested_value = get_nested_value(foo, bar)
#   > "a3"
#   bar = ["c", "d", "f"]
#   > None
def get_nested_value(nested_object, path_to_value):
	# Define the accumulator function
	def acc_fn(obj, key):
		if obj and hasattr(obj, 'get'):
			return obj.get(key)
	# Use the reducer function to do the heavy work
	return reduce(acc_fn, path_to_value, nested_object)