How to get items from a dictionary when the items are user input-python

lavender_frog 0
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Problem to solve: Write a script that enables the user to enter mathematical word problems like “What is two times three” and “What is seven minus five”, then use string processing to break apart the string into the numbers and the operation and return the result. So “two times three” would return 6 and “seven minus five” would return 2. To keep things simple, assume the user enters only the words for the numbers 0 through 9 and only the operations 'plus', 'minus', 'times' and 'divided by'.

Code written so far:

import operator
numbers = {'zero':0,'one':1,'two':2, 'three':3, 'four':4, 'five':5, 'six':6, 'seven':7, 
   'eight':8,'nine':9, 'plus': operator.add, 'minus': operator.sub, 'times': operator.mul, 
   'divided by':operator.truediv}
word_problem=(input('Type your word problem in this format: "What is two times three" ' ))
beginning_problem, seperator, new_problem=word_problem.rpartition('what is ')
result = new_problem.split()
result=tuple((result))
print(result)
print(numbers.get(result))

This allows me to input the question and prints a tuple of the relevant words (two times three) but then only prints "none"

user-input tuples dictionary python
1 Answers

welcome!

Your code has some flaws:

beginning_problem, seperator, new_problem=word_problem.rpartition('what is ')

the above line is not working properly (it will only work for "what is..." but your own example is using "What is..." (capital w). To work with both, I suggest you use lower().

beginning_problem, seperator, new_problem=word_problem.lower().rpartition('what is ')

result = new_problem.split()

result is a list, and numbers.get is expecting a key (an immutable value). In your case, I think you need to pass every element of the result list.

for element in result:
  print(numbers.get(element))

You can also use numbers[key] instead of numbers.get(key). Se the differences here. Below is an example:

for element in result:
  print(numbers.get(element))

Just for clarification:a tuple is also an immutable value and can be used as a key for dicts, for instance:

numbers = {(2,3): "2 and 3"}

However, I think it is not what you are trying to do.

Good luck with your project!

julianofischer0
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