Currencies

Save all functions into the same file named currencies.py.

We define a first string format as:

amount currency

where amount does not contain decimals, currency always contains three characters and where the separation between amount and currency is always a single whitespace. Example: ‘235 EUR’

We define a second string format as:

employee_type:amount currency

where employee_type is a single character meaning: ‘D’ (managing director), ‘P’ (project manager) or ‘T’ (technician), amount does not contain decimals, currency always contains three characters and where the separation between employee_type and amount is always a colon and the separation between amount and currency is a single whitespace. Example: ‘D:230 EUR’

1. Write function extract_currency() that takes a string in the first format, and returns a new string with the currency. If the given string is empty, it returns also an empty string. Example:

   >>> extract_currency('235 EUR')
   'EUR'
   >>> extract_currency('1029 USD')
   'USD'
   >>> extract_currency('')
   ''
   

   Note

   More tests are provided in file test-currencies1.txt

2. Write function extract_amount() that takes a string in the first format, and returns the corresponding amount (int). If the given string is empty, it returns -1. Example:

   >>> extract_amount('235 EUR')
   235
   >>> extract_amount('1029 USD')
   1029
   >>> extract_amount('')
   -1
   

   Note

   More tests are provided in file test-currencies2.txt

3. Write function employee_cost() that takes a string in the second format, and returns a float with the cost amount in euros, taking into account that when the employee is a managing director, the returning cost is 0.0. There are only two possible currencies other than euros, ‘USD’ and ‘AUD’ and the fix conversion to be applied will be: 1USD = 0.9EUR and 1AUD = 0.65EUR. This function must call the two previous functions extract_currency() and extract_amount(). Example:

   >>> round(employee_cost('D:230 EUR'),1)
   0.0
   >>> round(employee_cost('P:120 USD'),1)
   108.0
   >>> round(employee_cost('T:110 AUD'),1)
   71.5
   

   Note

   More tests are provided in file test-currencies3.txt

4. Write function convert_cost() that takes a string in the second format, and returns another string with the following format:

   amount EUR

   where amount is the integer part of the amount in the given string, converted to euros, taking into account that when the employee is a managing director, the returning cost is 0.0. There are only two possible currencies other than euros, ‘USD’ and ‘AUD’ and the fix conversion to be applied will be: 1USD = 0.9EUR and 1AUD = 0.65EUR. This function must call the previous one employee_cost(). Example:

   >>> convert_cost('P:120 USD')
   '108 EUR'
   >>> convert_cost('P:110 AUD')
   '71 EUR'
   >>> convert_cost('D:230 EUR')
   '0 EUR'
   

   Note

   More tests are provided in file test-currencies4.txt

Solution

A solution of these functions is provided in file currencies.py