List clear()

Question

What is clear() method any one explain me in comment

Answer 1

[edited: ***] The clear() method for lists has a behaviour that has to be considered. I have done this demo in the console, but same thing happens in a regular python file that is executed:

>>> res = [24,2] # create res with some numbers
>>> buf = [1,2,3] # create buf with also some numbers
>>> res.append(buf) # now append buf to res
>>> res # res is now:
[24, 2, [1, 2, 3]]
>>> buf.clear() # now clear buf
>>> res # this is what res looks now:
[24, 2, []]

*** i remember that HonFu has done a great tutorial that explaines why things like these happens.

Answer 2

clear() deletes all entries.

Please begin to google such general questions.
Finding good pages and learn to read the docu of a method ist very important and one should learn it very soon.

For beginner I recommend w3schools.
https://www.w3schools.com/JUMP_LINK__&&__python__&&__JUMP_LINK/ref_list_clear.asp.

Answer 3

The mentioned tutorial was this one.

Yeah, aforementioned case clearly a reference issue.

https://code.sololearn.com/c89ejW97QsTN/?ref=app

Answer 4

Lothar what is surprising on that?