IndexError : List Out of Range

Question

Due to using NTAG213 and MFRC522 (RFID), so I read the database from NTAG213. So there's something that I changed, and you can see that the problem may in the "num_to_dec" but I confused how to change it. This is how the error looks:

And this is my code

so this is the code i tried:

   def uid_to_num(self, uid):
       n = 0
       for i in range (0, 8): #due to ntag213 have 7 bytes UID
           n = n*256 + uid[i] #error
   return n

you can see in the image that I attached, and the error indicates to that line.

Please, copy the error message instead of posting a screenshot. — OriolAbril, May 22 '18 at 00:02
Try using `for digit in uid:`, then `n = n*256 + digit` which should avoid any `IndexError`s (assuming `uid` is something iterable). — martineau, May 22 '18 at 00:12
u just posted a link to a google repository in which the standart library for this reader is. u did not code anything on your own? — clockw0rk, Jun 06 '19 at 14:02

score 0 · Answer 1 · answered May 21 '18 at 23:47

0

Most probably, your uid length is less than 8 and so it is getting out of index error. will int(uid) work for you?

https://docs.python.org/2/library/functions.html#int

answered May 21 '18 at 23:47

vaichidrewar

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score 0 · Answer 2 · edited Jul 27 '18 at 15:59

0

I am also using MFRC522 reader and sometime this error arises for code in my card. Since whatever you write in code in Write.py file is not suitable with Read.py file. So Write card again and use that card according to inputs.

If you write new data:

id:
time:

but your Read file not according to that

print (id)
print(text)

note: write card code again then apply in Read file

edited Jul 27 '18 at 15:59

Patrick Mevzek

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answered Jul 27 '18 at 14:54

sajan saroor

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IndexError : List Out of Range

2 Answers2