Main.py

'''
Currency Converter
Input: An amount of money, it's ISO 4217 currency code and the ISO 4217 currency code to convert the money too
Output: The converted currency and which country it can be used in
This program is built off using a class object for the currencies, and then using external iterative functions for the calculations
It calls from a text file for useful data of the currencies.
'''

class Currency:     # this is the class currency to hold all the important data for us to use for the source and target currency
    def __init__(self, country, name, code, rate):
        self.country = country     # this holds the countries name which the currency can be used in
        self.name = name           # this holds the currency's name
        self.code = code           # this holds the currency's ISO 4217 code
        self.rate = rate           # this holds the currency's GBP conversion rate


# this is the main function of the program where all the user inputs are called and used
def main():
    original_currency, target_currency = None, None     # presets the variables empty to begin with

    loop = True
    while loop == True:     # this starts a loop
        original_amount = input("Please enter the amount of money you would like to convert: ") # asks the user to enter an input
        try:
            original_amount = round(float(original_amount), 2) # converts the user's input to a float and rounds it to two ddecimal places
            loop = False    # if no Value Error occurs, then the user has entered a valid amount of money and the loop breaks

        except ValueError:  # if the value error does occur
            print("This is not an amount of money, please try again.")  # this lets the user know that what they entered is mot suitable
            loop = True # continues the loop so the user can enter another amount of money

    original_code = input("Please enter the ISO 4217 currency code of the money you want to convert: ") #  user enters their current ISO 4217 code
    original_code = original_code.replace(" ","")       # this removes all spaces from the string
    original_code = original_code.upper()               # this makes all the characters are uppercase to match the data in our file

    target_code = input("Please enter the ISO 4217 currency code of which you want to convert to: ")  #  user enters their target ISO 4217 code
    target_code = target_code.replace(" ", "")          # this removes all spaces from the string
    target_code = target_code.upper()                   # this makes all the characters are uppercase to match the data in our file

    file = open("Country_Codes.txt", mode="r")  # this opens the text file we're using in read mode

    for line in file:   # this loops through each line in the file, this is currently fine as it is only a small text file
        country, name, code, rate = line.split(", ")    # this splits the string and creates new variables

        if original_code == code:   # this checks to see if the original code the user gets matches the line's code
            original_currency = Currency(country, name, code, float(rate)) # this creates the new instance of the Currency class for the original currency

        if target_code == code:     # this checks to see if the target code the user gets matches the line's code
            target_currency = Currency(country, name, code, float(rate))    # this creates the new instance of the Currency class for the target currency

    if original_currency == None or target_currency == None:     # this checks if the codes have been found
        print("Your currency was not found, try enter the infomation again")    # if they haven't been found, it notifies the user
        main()  # starts the program again

    else:   # if they have been found, the program continues
        GBP = float(original_amount) / original_currency.rate    # converts original currency to british sterling
        conversion = round(GBP * target_currency.rate, 2)        # then converts the british sterling to the new curency, and rounds it up to two decimal places
        print("The value of your money will be " + str(conversion) + " " + target_currency.name + " in " + target_currency.country) # outputs to the user the country, name of the currency and the amount of money they would have



main()