Why its giving an error?

Question

Why its giving a syntax error and what does cannot assign to function call means.
https://code.sololearn.com/c3nk1LN01Mx6/?ref=app

Answer 1

in STC.lower(), lower() is a call to function and when you Loop over something ,the value is assigned to that variable or in your case function call .

Example : for i in "hey":

here first, i is assigned 'h' ,then 'e' and finally 'y'.