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check_valid.py
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check_valid.py
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#performs validation and corrects ID if possible
#
#Author: Buddhika De Seram
def check(id):
flag = 1
final = 0
pos = 0
position = 0
alternative = []
possible = []
while flag:
# if number of characters in ID is less than 4, wrong detection
if len(id) < 4:
# print 'here'
flag = 0
break
#list of possible solutions
no_matches = [] #count of how many matches in list possible
f = open('E:\\database\\available.txt', 'r')
data = f.readlines()
for i in data:
i = i.strip('\n')
# first check: is length of item in database same as id detected
if len(i) == len(id) or len(i) == len(id)+1:
possible.append(i)
# print possible
if len(possible) == 0:
break
# second check: check if detected in one go
for i in possible:
if id == i:
# print "Matched"
final = 1
flag = 0
break
# third check: check every character select most matching item in sequence
highest_match = 0 #current highest match
#in the list of possible, every number is iterated in order to look for matches, matches are recorded in no_matches
for i in possible:
match = 0
x = 0
for j in id:
if i[x] == j:
match+=1
x+=1
no_matches.append(match)
#list of closest results
for i in no_matches:
if i > highest_match:
highest_match = i
pos = position
alternative = []
if i == highest_match:
alternative.append(possible[position]) #list alternative is appended with ID that has the highest matches. number of matches are all same
position += 1
#decides the number of allowed errors
if len(id)>5:
error = 3
else:
error = 2
if no_matches[pos] > (len(id) - error):
final = 1
break
elif len(alternative) != 1 and no_matches[pos] > (len(id) - error-1): #if there is more than one alternative, display error and store alternatives in a txt file
final = 0
break
else:
final = 0
break
if pos == 0:
possible.append('None')
return (final, alternative, possible[pos])