Difference: REPLAndStandardPythonProgramming (9 vs. 10)

Revision 102020-06-01 - UliRaich

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META TOPICPARENT	name="Exercises"

Course on Internet of Things

Exercises Session 1:

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Bonus points: Writing a parser for user input is rather easy if the numbers and operator are separated by spaces (have a look at the split method of strings). It is quite a bit more tricky if you allow entering calculations without spaces between the operands and the operator. Can you write a parser accomplishing this?

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Hint: A very elegant solution to this is the use of regular expressions and Python provides a module helping you with this:

https://docs.micropython.org/en/latest/library/ure.html

Try your parser on this input:

Input	ok or not ok
5.3+4.7	ok

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empty string	not ok
5.3+.	not ok
5.3+	not ok

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-1--1	ok
--1--1	not ok

Try also several spaces in between operands and operator.

https://afnog.iotworkshop.africa/pub/IoT_Course_English/REPLAndStandardPythonProgramming/calculatorV3.py.txt

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