Step 1

Write a command line program, that accepts dual-operand infix-only mathematical equations and calculates the results, in an endless loop.1

You may assume the user input has the structure: operand 1, space, operator, space, operand 2 like so 1 + 5 or 6 - 8.2

It should at least accept +, -, *, / as operators.3 4 5

Example:

Enter your equation:
2 - 4  
-2

Step 2

Log6 your calculations and their results in a textfile.
Use the following format: 1 + 5 = 6 7

  1. A while loop would be appropriate here. ↩

  2. Since we assume operands and operator are separated by spaces, we can split the string at the spaces. input.split(' ') ↩

  3. Remember to cast the operands to an int or even better float, once you have split it. ↩

  4. Also remember, that you can pack multiple if/else commands:

    if condition1:
    # commands
elif condition2:
    # commands
#there is no limit to the number of elifs
else:
    # normal case

    ↩

  5. Do not forget to catch the ZeroDivisionError Exception! ↩

  6. You can log it using append mode: open(filename, 'a') ↩

  7. Do not forget to add a newline at the end of every line, ↩