codonPython/codonPython/nhsNumberGenerator.py at UpgradeDateVal · codonlibrary/codonPython

39 lines (33 loc) · 1.18 KB

import random

def nhsNumberGenerator(to_generate: int)->list:

"""

Generates random NHS number(s) compliant with modulus 11 checks recorded

in the data dictonary.

https://www.datadictionary.nhs.uk/data_dictionary/attributes/n/nhs/nhs_number_de.asp?shownav=1

Parameters

----------

to_generate : int

number of NHS numbers to generate

Returns

----------

generated : list

List of randomly generated NHS numbers

Examples

---------

>>> random.seed(42)

>>> nhsNumberGenerator(2)

[7865793030, 1933498560]

"""

generated = []

while len(generated) < to_generate:

# Random 9 digit number starting with non-zero digit

number = random.randint(100000000, 999999999)

digits = [int(digit) for digit in str(number)]

# Apply weighting to digits

weighted_digits = [(10 - index) * digit for (index, digit) in enumerate(digits)]

# Sum of all weighted digits must be a multiple of 11 to be valid.

if sum(weighted_digits) % 11 == 0:

# Add check digit to valid number

number = int(str(number) + "0")

generated.append(number)

return generated

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