Python/strings/string_to_num.py at 897ed83c94b7075aa2d3bab885984e5b6d0150f4 · TheAlgorithms/Python · GitHub

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
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
"""Converts a given string to integer and float
This works with only Indian system of wording

 * Indian system uses crore, lakh, thousand and not million and billions

For the part after the decimal example ( .159 ):
     * Digit by digit ( .159 ) -> point one five nine is allowed
     * Anything else will throw an error

>>> to_int("Five")
5
>>> to_float("Five")
5.0

>>> to_int("One thousand five hundred and two")
1502
>>> to_float("One thousand five hundred and two")
1502.0

>>> to_int(
...     "Ninety nine crore three lakh seventy two thousand and six point one five nine"
... )
990372006

>>> to_float(
...     "Ninety nine crore three lakh seventy two thousand and six point one five nine"
... )
990372006.159

wikipedia explanation - https://en.wikipedia.org/wiki/Numeral_(linguistics)
"""


def to_int(word: str) -> int:
    if len(word.strip()) > 0:
        units = {
            "zero": 0,
            "one": 1,
            "two": 2,
            "three": 3,
            "four": 4,
            "five": 5,
            "six": 6,
            "seven": 7,
            "eight": 8,
            "nine": 9,
            "eleven": 11,
            "twelve": 12,
            "thirteen": 13,
            "fourteen": 14,
            "fifteen": 15,
            "sixteen": 16,
            "seventeen": 17,
            "eighteen": 18,
            "nineteen": 19,
        }

        tens = {
            "ten": 10,
            "twenty": 20,
            "thirty": 30,
            "forty": 40,
            "fifty": 50,
            "sixty": 60,
            "seventy": 70,
            "eighty": 80,
            "ninety": 90,
        }

        multipliers = {
            "hundred": 100,
            "thousand": 1_000,
            "lakh": 1_00_000,
            "crore": 1_00_00_000,
        }

        if "point" in word:
            word_lst = word.split("point")
            word = "".join(word_lst[:-1])

        words = (
            word.strip()
            .replace(" and", "")
            .replace("-", "")
            .replace("_", "")
            .lower()
            .split()
        )

        number = 0
        temp = 0

        for index, word in enumerate(words):
            if index == 0:
                if word in units:
                    temp += units[word]
                elif word in tens:
                    temp += tens[word]
                else:
                    temp += multipliers[word]
            elif index == (len(words) - 1):
                if word in units:
                    temp += units[word]
                    number += temp
                elif word in tens:
                    temp += tens[word]
                    number += temp
                else:
                    temp *= multipliers[word]
                    number += temp
            elif word in units:
                temp += units[word]
            elif word in tens:
                temp += tens[word]
            elif word in multipliers:
                temp *= multipliers[word]
                number += temp
                temp = 0

        if len(words) > 1:
            return number
        else:
            return temp
    else:
        raise ValueError("Empty input is not a valid number in words")


def to_float(word: str) -> float:
    units = {
        "zero": 0,
        "one": 1,
        "two": 2,
        "three": 3,
        "four": 4,
        "five": 5,
        "six": 6,
        "seven": 7,
        "eight": 8,
        "nine": 9,
        "eleven": 11,
        "twelve": 12,
        "thirteen": 13,
        "fourteen": 14,
        "fifteen": 15,
        "sixteen": 16,
        "seventeen": 17,
        "eighteen": 18,
        "nineteen": 19,
    }

    all_words = (
        word.strip()
        .replace(" and", "")
        .replace("-", "")
        .replace("_", "")
        .lower()
        .split("point")
    )
    if len(all_words) > 1:
        word = all_words[0]
        after_point = all_words[1].split()

        integer_part = to_int(word)

        decimal_part = ""
        for num in after_point:
            if num in units:
                decimal_part += str(units[num])

        str_float = str(integer_part) + str(decimal_part)
        divider = "1" + ("0" * len(after_point))
        return int(str_float) / int(divider)

    else:
        return float(to_int(word))


if __name__ == "__main__":
    import doctest

    doctest.testmod()
    # while True:
    #     word = input("Enter a number in words (q to quit) :- ").lower().strip()
    #     if word == "q":
    #         break
    #     else:
    #         integer = to_int(word)
    #         print(f"\nThe number in {type(integer)} --> {integer} ")
    #         floater = to_float(word)
    #         print(f"\nThe number in {type(floater)} --> {floater} ")