Welcome to Wordy on Exercism's Python Track.
If you need help running the tests or submitting your code, check out HELP.md.
Parse and evaluate simple math word problems returning the answer as an integer.
Problems with no operations simply evaluate to the number given.
What is 5?
Evaluates to 5.
Add two numbers together.
What is 5 plus 13?
Evaluates to 18.
Handle large numbers and negative numbers.
Now, perform the other three operations.
What is 7 minus 5?
2
What is 6 multiplied by 4?
24
What is 25 divided by 5?
5
Handle a set of operations, in sequence.
Since these are verbal word problems, evaluate the expression from left-to-right, ignoring the typical order of operations.
What is 5 plus 13 plus 6?
24
What is 3 plus 2 multiplied by 3?
15 (i.e. not 9)
The parser should reject:
- Unsupported operations ("What is 52 cubed?")
- Non-math questions ("Who is the President of the United States")
- Word problems with invalid syntax ("What is 1 plus plus 2?")
Sometimes it is necessary to raise an exception. When you do this, you should always include a meaningful error message to indicate what the source of the error is. This makes your code more readable and helps significantly with debugging. For situations where you know that the error source will be a certain type, you can choose to raise one of the built in error types, but should still include a meaningful message.
This particular exercise requires that you use the raise statement to "throw" a ValueError if the question passed to answer() is malformed/invalid, or contains an unknown operation. The tests will only pass if you both raise the exception and include a message with it.
To raise a ValueError with a message, write the message as an argument to the exception type:
# if the question contains an unknown operation.
raise ValueError("unknown operation")
# if the question is malformed or invalid.
raise ValueError("syntax error")- @betegelse
- @behrtam
- @BethanyG
- @cmccandless
- @Dog
- @dvermd
- @fluxusfrequency
- @fortrieb
- @Grociu
- @ikhadykin
- @jackattack24
- @kytrinyx
- @N-Parsons
- @Nishant23
- @parinporecha
- @pheanex
- @rootulp
- @sjakobi
- @tqa236
- @yawpitch
Inspired by one of the generated questions in the Extreme Startup game. - https://github.com/rchatley/extreme_startup