Update 2/16/2021: See the discussion of this post on Hacker News.
The standard wisdom is that Python strings are immutable. You can’t change a string’s value, only the reference to the string. Like so:
x = "hello" x = "goodbye" # New string!
Which implies that each time you make a change to a string variable, you are actually producing a brand new string. Because of this, tutorials out there warn you to avoid string concatenation inside a loop and advise using join instead for performance reasons. Even the official documentation says so!
This is wrong. Sort of.
