# Flattening JSON objects in Python 
# for a array value of a key
unflat_json = {'user' :
               {'Rachel':
                {'UserID':1717171717,
                'Email': 'rachel1999@gmail.com', 
                'friends': ['John', 'Jeremy', 'Emily']
                }
               }
              }
  
# Function for flattening 
# json
def flatten_json(y):
    out = {}
  
    def flatten(x, name =''):
          
        # If the Nested key-value 
        # pair is of dict type
        if type(x) is dict:
              
            for a in x:
                flatten(x[a], name + a + '_')
                  
        # If the Nested key-value
        # pair is of list type
        elif type(x) is list:
              
            i = 0
              
            for a in x:                
                flatten(a, name + str(i) + '_')
                i += 1
        else:
            out[name[:-1]] = x
  
    flatten(y)
    return out
  
# Driver code
print(flatten_json(unflat_json))