To write a Python script that does the DESFire UID manipulation, please refer to the steps below:
STEP 1:
Create a new Variable (Example: var_uid) and give it the value of the UID from your database.
STEP 2:
Drag the var_uid to the card layout.
STEP 3:
Insert in function the Python script:
uid = uid_var
str = str(uid)
x = len(str)
uid_var = str[x-8:x] 8 is set as a example:
STEP 4:
Go to Data\Variables double click on the variable name in this case is: var_uid and give it the value of MIFARE DESFire UID.
STEP 5:
Go to content and change the window option to script.
After that, please close the properties window and you should have the expected result.