Deleted internal workings of arithmetic.py. Calculator, deleted and rewrote tokens, try and except statements
Added else statement in case cmd is not in dictionary. If not, list of keys is printed.
Wrote and tested addition and subtraction (without edge cases)
Wrote and tested addition and subtraction (without edge cases)
Wrote and tested divide and multiply functions (not edge cases)
Wrote and tested square, cube, and power functions (not edge cases)
To handle 0 passed as an argument (was giving error because zero stayed a string):

insert if statement in try, so that if value is 0, converted to int.
Add if statement to handle 0. Restore addition function.
Working on zero division problem. Get error in 0 comes after first numerical argument. Trying to use if statements in / and mod funcs
Renamed files so as to not replace remote versions. Changed import statement.
Renamed files