"""
    Write a command line program in the language of your choice that will take operations on fractions as an input and produce a fractional result.

    Legal operators shall be *, /, +, - (multiply, divide, add, subtract).

    Operands and operators shall be separated by one or more spaces.

    Mixed numbers will be represented by whole_numerator/denominator. e.g. "3_1/4".

    Improper fractions and whole numbers are also allowed as operands.

    Example run
    ? 1/2 * 3_3/4
    = 1_7/8

    ? 2_3/8 + 9/8
    = 3_1/2
"""

python fractionfun.py will give you a prompt and you can type stuff.

Running the command behave will do something interesting. If you don’t have behave then see the section Installing behave.

Note that running behave will pick a random Python to run with. I added runbehave.py so that you can run it with any Python you want. On my machine I do python2 runbehave.py and python3 runbehave.py to run with Python 2 and Python 3.

Running test.py with your Python of choice will run the unit tests.

PythonFractionFun$ coverage3 run test.py
.......
----------------------------------------------------------------------
Ran 7 tests in 0.001s

OK
PythonFractionFun$ coverage3 report
Name             Stmts   Miss  Cover
------------------------------------
fractionfun.py      31      8    74%
test.py             24      0   100%
------------------------------------
TOTAL               55      8    85%

pip3 install coverage worked for me, but you can consult the coverage docs if you want to understand more.

pip3 install behave worked for me, but you can consult the behave docs if you want to understand more.