Handler Functions Excercise

This program accepts commands and values, calls handler functions and prints returned results.

Usage

This program is used by providing a valid command and one or more arguments.

Run the command py convert.py with no arguments to see the usage syntax and valid commands:

convert.py <command> <value1> [value2 ... valueN]

Where commands are:
    c_to_f        Convert Celsius number to Fahrenheit
    f_to_c        Convert Fahrenheit number to Celsius
    USD_to_THB    Convert US Dollar (USD) amount to Thai Baht (THB)
    THB_to_USD    Convert Thai Baht (THB) amount to US Dollar (USD)

Test Handler Function

You will need to implement the above commands and their corresponding handler functions. A handler function is a function that processes the arguments for a particular command and returns the results.

The convert.py file contains starter code for a command called test and a handler function named test_func. This is an example to help you get started, but this example code should be removed and replaced with the actual handler functions for the valid commands.

Completed Program Usage and Output

Celcius to Fahrenheit

$ py convert.py c_to_f 37.3
99.14

Fahrenheit to Celcius

$ py convert.py f_to_c 104.9
40.5

USD to THB

Use a conversion rate of 1 USD to THB of 33.948286. Otherwise these values will be different.

$ py convert.py USD_to_THB 75
2546.12145

THB to USD

$ py convert.py THB_to_USD 7945
234.03243392022793

Unit Tests

Unit Tests are used to test each function our Python code, or at least the functions that are meant to be called by users of our convert module.

The Unit Tests are already created for you if you define your handler functions as c_to_f(cmd, args), f_to_c(cmd, args), usd_to_thb(cmd, args), and thb_to_usd(cmd, args). You can inspect test_convert.py to see how they work.

Here is how to run the Unit Tests, showing success:

py test_convert.py
....
----------------------------------------------------------------------
Ran 4 tests in 0.000s

OK