Convert float and Normilize string for converting

convert_float.py

import re
import unicodedata

import chardet

def replace_some_unicode_chars(frac_str):
    try:
        if isinstance(frac_str, str):
            frac_str = frac_str.replace("⁄", "/")
            frac_str = frac_str.replace("×", "x")
            frac_str = frac_str.replace("�", " ")
            frac_str = frac_str.replace("”", '"')
            frac_str = frac_str.replace("′′", '"')
            frac_str = frac_str.replace("½", ' 1/2')
            frac_str = frac_str.replace("¼", ' 1/4')
            frac_str = frac_str.replace("¾", ' 3/4')
            frac_str = frac_str.replace("⅔", ' 2/3')
            frac_str = frac_str.replace("⅕", ' 1/5')
            frac_str = frac_str.replace("⅖", ' 2/5')
            frac_str = frac_str.replace("⅗", ' 3/5')
            frac_str = frac_str.replace("⅘", ' 4/5')
            frac_str = frac_str.replace("⅙", ' 1/6')
            frac_str = frac_str.replace("⅚", ' 5/6')
            frac_str = frac_str.replace("⅛", ' 1/8')
            frac_str = frac_str.replace("⅜", ' 3/8')
            frac_str = frac_str.replace("⅝", ' 5/8')
            frac_str = frac_str.replace("⅞", ' 7/8')
    except Exception:
        pass
    finally:
        return frac_str


def normalize_frac_str(frac_str, c1='latin-1', c2='utf-8'):
    '''
    Example: https://repl.it/NH2p/14

    :param frac_str:
    :param c1:
    :param c2:
    :return:
    '''
    try:
        try:
            if not frac_str:
               return None
            if not isinstance(frac_str, bytes):
                frac_str = replace_some_unicode_chars(frac_str)
                new_frac_str = bytes(frac_str, c1)
                d = chardet.detect(new_frac_str)
                if d['encoding'] not in ['latin-1', 'ISO-8859-1', 'ascii']:
                    frac_str = new_frac_str
        except ValueError:
            pass
        if not isinstance(frac_str, str):
            frac_str = frac_str.decode(c2)
        frac_str = unicodedata.normalize("NFKC", frac_str)
        frac_str = re.sub('\s+', ' ', frac_str)
        frac_str = replace_some_unicode_chars(frac_str)
    except ValueError:
        return str(frac_str)
    return frac_str


def get_first_number_from_text(frac_str):
    '''
    Example: https://repl.it/NH2p/14

    :param frac_str:
    :return:
    '''

    try:
        try:
            frac_str = normalize_frac_str(frac_str)
            frac_str = float(frac_str)
        except ValueError:
            frac_str = re.sub('[^\s\d\/.,]+', ' ', frac_str)
            frac_str = re.sub('[,]+', '.', frac_str)
            frac_str = re.sub('[.]+', '.', frac_str)
            frac_str = frac_str.strip()
            if '/' in frac_str:
                num, denom = frac_str.split('/')
                num = num.strip()
                denom = denom.strip()
                try:
                    leading, num = re.split('\s+', num)
                    whole = float(leading)
                except ValueError:
                    whole = 0
                frac = float(num) / float(denom)
                frac_str = whole - frac if whole < 0 else whole + frac
            else:
                frac_str = re.sub('\s+', '', frac_str)
                frac_str = float(frac_str)
    except ValueError:
        frac_str = None
    finally:
        return frac_str


def get_unit_str_from_raw(raw_str):
    unit_str = None
    if raw_str is None:
        return unit_str
    raw_str = str(raw_str).strip()

    if len(raw_str):
        unit_str = raw_str

    return unit_str

Result:

3 1/4'' x 13 5/8 | 3 1/4'' x 13 5/8
3 1/4'' x 13 5/8 | 3 1/4'' � 13 5/8
3 1/4'' x 13 5/8 | b"3 1/4'' \xc3\x97 13 \xe2\x85\x9d"
3 1/4'' x 13 5/8 | 3 1/4'' x 13 �
3 1/4'' x 13 5/8 | 3 1/4'' × 13 ⅝

Convert to float
13.625 | � 13 5/8 incehs
13.625 | x 13 5/8 incehs
13.625 | b' \xc3\x97 13 \xe2\x85\x9d incehs'
13.625 | x 13 � incehs
13.625 | × 13 ⅝ incehs