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- kdnr = "KD3457619742"
- KDtest = kdnr.startswith("KD") #is true when kdnr starts with "KD"
- digittest = kdnr[2:10] #is true when 3rd-9th are digits (0-9)
- sum = int(kdnr[2]) + int(kdnr[3]) + int(kdnr[4]) + int(kdnr[5]) + int(kdnr[6]) + \
- int(kdnr[7]) + int(kdnr[8]) + int(kdnr[9]) #Quersumme
- KDend = int(kdnr[10:12]) #last two digits of kdnr
- if KDtest:
- if digittest:
- if sum == KDend:
- print("Die Kundennummer ist zulässig") #the kdnr is only correct if all conditions are true
- else:
- print("Die Kundennummer entspricht nicht den Bedingungen!")
- else:
- print("Die Kundennummer entspricht nicht den Bedingungen!")
- else:
- print("Die Kundennummer entspricht nicht den Bedingungen!")
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