Michael_W_currency_converter.py

currency_converter.py

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+#Below is not my code. I wanted to try and reverse engineer someone elses.
+#
+#http://www.codecoms.com/2014/09/Currency-Converter-in-Python/
+
+#!/usr/bin/python
+import sys, os, os.path, urllib2, re, cookielib, time, datetime, locale
+
+file = 'conv_rates.txt' #file containing the exchange rates
+
+locale.setlocale( locale.LC_ALL, '' )
+
+def check_file(file):
+    #check that the file exists and it's not empty
+    if os.path.exists(file) == False or os.stat(file).st_size == 0:
+        grab_web_rates()
+
+    #check that the file is no more than 24 hours old
+    if  time.time() - os.path.getmtime(file) > 86400: #file older than 24 hours
+        #grab the currency exchange data form the internet
+        grab_web_rates()
+    else: #file is up to date
+        return create_exchange_dict()
+
+def create_exchange_dict():
+    exchange_rates_dict = {}
+    conversion_rates = open (file, 'r') #open file read only
+
+    for line in conversion_rates:
+        exchange_rates_dict[line.split(",")[0]] = line.split(",")[1]
+
+    conversion_rates.close()
+    return exchange_rates_dict
+
+def grab_web_rates():
+    conversion_rates = open (file, 'w')
+    web = urllib2.urlopen('http://www.x-rates.com/table/?from=USD')
+    html = web.read()
+    line = 1
+    titles = re.findall(r'<td class=\'rtRates\'>
+    <a href=\'/graph/\?from=(.*?)</td>', html)
+    for title in titles:
+        title = title.replace("amp;to=", "")
+        title = title.replace("&", "-")
+        title = title.replace("'>", ",")
+        title = title.replace("</a>", " ")
+        title = title.replace("  ", "")
+        title = title.rstrip()
+        conversion_rates.write(title + ' \n')
+        line += 1
+        if line >= 23:
+            break
+    conversion_rates.close()
+
+def get_result(choice, amount):
+    dict = create_exchange_dict()
+    for exchange,rate in dict.items():
+        if exchange == choice:
+            result = amount * float(rate)
+            return rate, result
+            break
+        else:
+            error = "Exchange not found! -get_result()- "
+
+def format_currency(value):
+    return "{:,.2f}".format(value)
+
+def checkChoice(choice):
+    if str.isdigit(choice): #check that the selection is a digit or exit
+        return True
+    else:
+        os.system('clear')
+        print "Thanks for using Currency Calculator! \n"
+        exit()
+
+def main():
+    os.system('clear')
+    print '''
+    Chose the Conversion:
+    1. US Dollar -> Euro
+    2. Euro -> US Dollar
+    3. US Dollar -> British Pound
+    4. British Pound -> US Dollar
+    5. US Dollar -> Canadian Dollar
+    6. Canadian Dollar -> US Dollar
+    7. US Dollar -> Chines Yuan
+    8. Chines Yuan -> US Dollar
+    9. US Dollar -> Peso Argentino
+    10. Peso Argentino -> US Dollar
+    0. Exit
+    '''
+    choice = raw_input("\t")
+
+    checkChoice(choice)
+    choice = int(choice)
+
+    #Exit script if the selection is not whithin the allowed range
+    if choice == 0 or choice > 10:
+        os.system('clear')
+        print "Thanks for using Currency Calculator! \n"
+        exit()
+
+    while choice != 0:
+        check_file(file)
+        amount = raw_input("Amount: ")
+
+        #Strips commas if found
+        if ',' in amount:
+            amount = ''.join(e for e in amount if e.isdigit() or e == '.')
+            amount = float(amount)
+        else:
+            amount = float(amount)
+
+        if choice == 1: #USD->Euro
+            os.system('clear')
+            choice = "USD-EUR"
+            r = get_result(choice, amount)
+            result = r[1]
+            rate = r[0]
+            e=u'\u20ac' #euro symbol
+            amount = locale.currency( amount, grouping=True )
+            print "Your amount (USD): ", amount
+            print "Converts to (EUR): ", e, format_currency(result)
+            print "The Euro (EUR) -> US Dollar exchange rate is: ", rate
+            break
+
+        elif choice  == 2: #EURO->USD
+            os.system('clear')
+            choice = "EUR-USD"
+            r = get_result(choice, amount)
+            result = r[1]
+            rate = r[0]
+            e=u'\u20ac' #euro symbol
+            amount = format_currency(amount)
+            print "Your amount (EUR): ", e, amount
+            print "Converts to (USD): ", locale.currency(result, grouping=True)
+            print "The US Dollar -> Euro (EUR) exchange rate is: ", rate
+            break
+
+        elif choice == 3: #GBP->USD
+            choice = "USD-GBP"
+            os.system('clear')
+            r = get_result(choice, amount)
+            result = r[1]
+            rate = r[0]
+            e = u'\xA3' #British Pound symbol
+            amount = locale.currency( amount, grouping=True )
+            print "Your amount (USD): ", amount
+            print "Converts to (GBP): ", e, format_currency(result)
+            print "The US Dollar -> British Pound (GBP) exchange rate is: ", rate
+            break
+
+        elif choice == 4: #USD->GBP
+            choice = "GBP-USD"
+            os.system('clear')
+            r = get_result(choice, amount)
+            result = r[1]
+            rate = r[0]
+            e = u'\xA3' #British Pound symbol
+            amount = format_currency(amount)
+            print "Your amount (GBP): ", e, amount
+            print "Converts to (USD): ", locale.currency(result, grouping=True )
+            print "The British Pound (GBP) -> US Dollar exchange rate is: ", rate
+            break
+
+        elif choice == 5: #CAD->USD
+            choice = "USD-CAD"
+            os.system('clear')
+            r = get_result(choice, amount)
+            result = r[1]
+            rate = r[0]
+            amount = locale.currency( amount, grouping=True )
+            result = locale.currency( result, grouping=True )
+            print "Your amount (USD): ", amount
+            print "Converts to (CAD): ", result
+            print "The US Dollar -> Canadian Dollar (CAD) exchange rate is: ", rate
+            break
+
+        elif choice == 6: #USD->CAD
+            choice = "CAD-USD"
+            os.system('clear')
+            r = get_result(choice, amount)
+            result = r[1]
+            rate = r[0]
+            amount = locale.currency( amount, grouping=True )
+            result = locale.currency( result, grouping=True )
+            print "Your amount (CAD): ", amount
+            print "Converts to (USD): ", result
+            print "The Canadian Dollar (CAD) -> US Dollar exchange rate is: ", rate
+            break
+
+        elif choice == 7: #USD->CNY
+            choice = "USD-CNY"
+            os.system('clear')
+            r = get_result(choice, amount)
+            result = r[1]
+            rate = r[0]
+            amount = locale.currency( amount, grouping=True )
+            print "Your amount (CNY): ", amount
+            print "Converts to Yuan (USD): " , format_currency(result)
+            print "The US Dollar -> Chinese Yuan (CNY) exchange rate is: ", rate
+            break
+
+        elif choice == 8: #CNY->USD
+            choice = "CNY-USD"
+            os.system('clear')
+            r = get_result(choice, amount)
+            result = r[1]
+            rate = r[0]
+            print "Your amount (CNY): ", format_currency(amount)
+            print "Converts to Yuan (USD): " , locale.currency( result, grouping=True )
+            print "The Chinese Yuan (CNY) -> US Dollar exchange rate is: ", rate
+            break
+
+        elif choice == 9: #USD->ARS
+            choice = "USD-ARS"
+            os.system('clear')
+            r = get_result(choice, amount)
+            result = r[1]
+            rate = r[0]
+            amount = locale.currency( amount, grouping=True )
+            print "Your amount (USD): ", amount
+            print "Converts in Peso Argentino (ARS): " , format_currency(result)
+            print "The US Dollar -> Peso Argentino (ARS) exchange rate is: ", rate
+            break
+
+        elif choice == 10: #ARS->USD
+            choice = "ARS-USD"
+            os.system('clear')
+            r = get_result(choice, amount)
+            result = r[1]
+            rate = r[0]
+            print "Your amount (ARS): ", format_currency(amount)
+            print "Converts to US Dollar (USD): " , locale.currency(result, grouping=True)
+            print "The Peso Argentino (ARS) -> US Dollar exchange rate is: ", rate
+            break
+
+        elif choice > 10:
+            exit()
+        break
+
+#execution
+main()