converter_1602_ELIZAVETA_CHUPRAKOVA.py

from forex_python.converter import CurrencyRates
from datetime import datetime


def parse_curr_val(value):
    c = CurrencyRates()
    curr_list = c.get_rates('USD').keys()
    if value in curr_list:
        return True
    else:
        return False


def isfloat(value):
    try:
        float(value)
        return True
    except ValueError:
        return False


def date_valid(date):
    try:
        datetime.strptime(date, '%Y-%m-%d')
        return True
    except ValueError:
        return False



c = CurrencyRates()
print("\tHELLO, dear user! My name is LISA and I want to present you my APPLICATION")

with open('get_history.txt', 'w') as f:
  pass

while True:
  print("\n Enter 1 to convert currency\n Enter 2 to get conversion history\n Enter 3 to exit the program")
  command = input()
  if command == '1':
      print('\nEnter the currency')
      first_curr = input().upper()
      while not parse_curr_val(first_curr):
          print('\nWrong format, enter the currency')
          first_curr = input().upper()
      print('\nEnter the currency you want to convert to')
      second_curr = input().upper()
      while not parse_curr_val(second_curr):
          print('\nWrong format, enter the currency you want to convert to')
          second_curr = input().upper()
      print('\nHow much? Enter amount of currency')
      amount = input()

      while not isfloat(amount):
          print('\nError, please, enter digit value')
          amount = input()
      amount = float(amount)
      print('\nWould you like to enter the date? Enter yes or no')
      dd = input().lower()
      while dd not in ['yes', 'no']:
          print("\nERROR. Enter 'yes' or 'no'")
          dd = input().lower()
      if dd == 'yes':
          print('\nEnter the date in format YYYY-MM-DD')
          curr_date = input()

          while not date_valid(curr_date):
              print("\nERROR. Enter the date in format YYYY-MM-DD")
              curr_date = input()


          curr_date = datetime.strptime(curr_date, '%Y-%m-%d').date()
          itog = round(c.convert(first_curr, second_curr, amount, curr_date), 2)
          with open('get_history.txt', 'a') as f:
              f.write(first_curr + ' ' + second_curr + ' ' + str(amount) + ' ' \
                      + str(curr_date) + ' ' + str(itog) + '\n')
          print('\n Result of conversion --', itog)
      elif dd == 'no':
          itog = round(c.convert(first_curr, second_curr, amount), 2)
          with open('get_history.txt', 'a') as f:
              f.write(first_curr + ' ' + second_curr + ' ' + str(amount) + ' ' + str(itog) + '\n')
          print('\n Result of conversion --', itog)
  elif command == '2':
      print('--- Conversion history ---\n')
      with open('get_history.txt', 'r') as f:
          print(f.read())
  elif command == '3':
      print('\nGoodbye!')
      break
  else:
      print("\nERROR")
      continue