1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
|
# nuit.py - functions for handling Mozambique NUIT numbers
# coding: utf-8
#
# Copyright (C) 2023 Leandro Regueiro
# Copyright (C) 2025 Luca Sicurello
#
# This library is free software; you can redistribute it and/or
# modify it under the terms of the GNU Lesser General Public
# License as published by the Free Software Foundation; either
# version 2.1 of the License, or (at your option) any later version.
#
# This library is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
# Lesser General Public License for more details.
#
# You should have received a copy of the GNU Lesser General Public
# License along with this library; if not, write to the Free Software
# Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
# 02110-1301 USA
"""NUIT (Número Único de Identificação Tributaria, Mozambique tax number).
This number consists of 9 digits, sometimes separated in three groups of three
digits using whitespace to make it easier to read.
The first digit indicates the type of entity. The next seven digits are a
sequential number. The last digit is the check digit, which is used to verify
the number was correctly typed.
More information:
* https://www.mobilize.org.mz/nuit-numero-unico-de-identificacao-tributaria/
* https://www.at.gov.mz/por/Perguntas-Frequentes2/NUIT
>>> validate('400339910')
'400339910'
>>> validate('400 005 834')
'400005834'
>>> validate('12345')
Traceback (most recent call last):
...
InvalidLength: ...
>>> format('400339910')
'400 339 910'
"""
from __future__ import annotations
from stdnum.exceptions import *
from stdnum.util import clean, isdigits
def compact(number: str) -> str:
"""Convert the number to the minimal representation."""
return clean(number, ' -.').strip()
def calc_check_digit(number: str) -> str:
"""Calculate the check digit."""
weights = (8, 9, 4, 5, 6, 7, 8, 9)
check = sum(w * int(n) for w, n in zip(weights, number)) % 11
return '01234567891'[check]
def validate(number: str) -> str:
"""Check if the number is a valid Mozambique NUIT number."""
number = compact(number)
if len(number) != 9:
raise InvalidLength()
if not isdigits(number):
raise InvalidFormat()
if calc_check_digit(number[:-1]) != number[-1]:
raise InvalidChecksum()
return number
def is_valid(number: str) -> bool:
"""Check if the number is a valid Mozambique NUIT number."""
try:
return bool(validate(number))
except ValidationError:
return False
def format(number: str) -> str:
"""Reformat the number to the standard presentation format."""
number = compact(number)
return ' '.join([number[:3], number[3:-3], number[-3:]])
|