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#!/bin/python
from functools import reduce
import sys
 
def adder(the_dict):
	def concat(x,y):
		nonlocal the_dict
		if x and y:
			return the_dict[x] + the_dict[y]
		elif x:
			return the_dict[x]
		else:
			return the_dict[y]
	return reduce(concat,the_dict)
 
d={'a':'fuck ','b':'this ','c':'pluses '}
print('d is\n',d)
print(adder(d))
 

Traceback (most recent call last):
  File "<string>", line 1, in <module>
  File "/usr/lib/python2.7/py_compile.py", line 117, in compile
    raise py_exc
py_compile.PyCompileError:   File "prog.py", line 7
    nonlocal the_dict
                    ^
SyntaxError: invalid syntax

Standard output is empty