Seperate string character without function python

Question

Can you separate this "+2x-5y+8+2y"(there isnt any spaces between characters) like [+2x,-5y,+8,+2y] in python? How?

related: https://stackoverflow.com/questions/43389684/how-can-i-split-a-string-of-a-mathematical-expressions-in-python/43389952 — Jean-François Fabre, Dec 02 '20 at 15:26
Yes, it is possible. The complexity of a solution would depend on the pattern of expressions you want to parse. — PM 77-1, Dec 02 '20 at 15:27

score 0 · Answer 1 · answered Dec 02 '20 at 15:34

if you know the pattern of the input for all which might come in, take a look at regular expressions

In your case, a solution could be something like

import re
a = "+2x-5y+8+2y"
print(re.findall(r"[+-]\d[xy]?", a))

re.findall(expression, input) requires a regular expression and a argument which shall be parsed In the above solution, the pattern [+-]\d[xy]? consists of

[+-] either a + or a - symbol
\d any digit, if you expect multiple digits use \d+ instead (+ meaning here "at least one repetition")
[xy]? one of the characters x and y, but it might be missing. If you expect other letters as well, add them inside these brackets

Seperate string character without function python

1 Answers1