validation-remove currency symbol from price

I have this one string, which is actually price, this price value comes with any currency symbol (currency_list), I am trying to remove these currency symbols from price and return only price.

Till now I am able to do it for prefix and suffix currency symbol using below code , everything works till here.

I just want to add one validation where if the symbol is not prefix or suffix like “200$434” in btw, then it should return not valid format. which I am not able to understand how should be implemented.

currency_list = ['USD', 'UNITED STATES DOLLAR', '$', 'EUR', 'EURO', '€', 'GBP','BRITISH POUND', '£']

Normally input string can be

"$1212212"
"1212212EURO"
"1212212"
"1212212 BRITISH POUND"

need help to validate values like "1212$343" or "1212212EURO323.23"

Code:

for symb in currency_list:
    if symb in amount:
        data = amount.replace(symb, '')

Answer

You can use regex to achieve your purpose.

import re

currency_list = ['USD', 'UNITED STATES DOLLAR', '$', 'EUR', 'EURO', '€', 'GBP', 'BRITISH POUND', '£']

p = re.compile(r'([D]*)([d]+.?[d]+)(.*)')

def verify_or_get_amount(amount):
    first, mid, last = [i.strip() for i in p.search(amount).groups()]

    if (first and first not in currency_list) or (last and last not in currency_list):
        print('invalid:', amount)
    else:
        amount = mid
        print('amount:', amount)
    return mid


for i in ['EURO123', 'EURO 123', 'EURO 123.', 'EURO .12', 'EURO 12.12', '$1212212', '1212212EURO', '1212212', '1212212 BRITISH POUND', '1212$343']:
    verify_or_get_amount(i)