PYTHON

how to fix valueerror in python

#Instead of
a = int(input("What is x?"))
#Put
try:
  	a = int(input("What is x?"))
except ValueError:
  print ("Insert ValueError message here")
#This way your program won't crash

how to fix value error in python

def example():
  i = 0
  resultlist_key = []
  result_list = list()
  a_list = list()
  b_list = list()
  a_list.append(feature_matrix_ip)# feature_matrix_ip contains features of the query image
  while i < 70:
      b_list.append(feature_matrix_db[i])# feature_matrix_db contains features of img. in DB
      dist = distance.euclidean(a_list,b_list[i])
      result_list.append(dist)
      resultlist_key = OrderedDict(sorted(enumerate(result_list),key=lambda x: x[0])).keys()
      i = i + 1 
      res_lst_srt = {'values': result_list,'keys':resultlist_key}
      res_lst_srt['values'], res_lst_srt['keys'] = zip(*sorted(zip(res_lst_srt['values'], res_lst_srt['keys'])))# sorting according to the least distance and the key will not change
      key = res_lst_srt['keys']