read_account and convert units.py

# Will try to open the account file. In case the file doesn't exist it will create a new account file.
def read_account_data():
    try:

        with open(file_name, 'r') as account_data:
            data = json.load(account_data)
            return data
    except:
        with open(file_name, 'w') as account_data:
            data = {}
            data['account_data'] = []
            data['account_data'].append({        
                'settings': [{'host': "Enter iota node uri with port", 'min_weight_magnitude': 15, 'units': "i"}],
                'address_data': [],
                'fal_balance': [{'f_index': 0, 'l_index': 0}],
                'transfers_data': []
            })
            json.dump(data, account_data)
            print("Created new account file!")
            return data


# Converts Iotas into the unit that is set in the account settings and returns a string
def convert_units(value):
    unit = settings[0]['units']
    value = float(value)

    if unit == "i":
        value = str(int(value)) + "i"
        return value

    elif unit == "ki":
        value = '{0:.3f}'.format(value/1000)
        value = str(value + "Ki")
        return value

    elif unit == "mi":
        value = '{0:.6f}'.format(value / 1000000)
        value = str(value) + "Mi"
        return value

    elif unit == "gi":
        value = '{0:.9f}'.format(value / 1000000000)
        value = str(value + "Gi")
        return value

    elif unit == "ti":
        value = '{0:.12f}'.format(value / 1000000000000)
        value = str(value + "Ti")
        return value