unable to remove all elements from list based on a condition

[sg_python]

list=[6.2,5.9,4.8,6.1,6.1,6.5,5.9,5.8,6.2]

for a in list:
    if a<=6.0:
       list.remove(a)
      
print(list)

The output i am getting is :

Output:
[6.2, 4.8, 6.1, 6.1, 6.5, 5.8, 6.2]

Q> Why 5.8 is NOT getting removed ?

Yoriz write Jan-27-2024, 09:34 AM:
Please post all code, output and errors (in its entirety) between their respective tags. Refer to BBCode help topic on how to post. Use the "Preview Post" button to make sure the code is presented as you expect before hitting the "Post Reply/Thread" button.

[Yoriz]

Removing an item from the list while looping over it changes the index location of the remaining items.
You can loop over a copy of the list and remove items from the original list

values=[6.2,5.9,4.8,6.1,6.1,6.5,5.9,5.8,6.2]
 
for value in values[:]:
    if value<=6.0:
       values.remove(value)
       
print(values)

Output:
[6.2, 6.1, 6.1, 6.5, 6.2]

Also note that you shouldn't use list as the variable name to contain your list as it overwrites the keyword list

[Pedroski55]

As Yoriz said, it is not good to remove items from a list while you are looping through it. Will cause problems!

Nor is it good to use the reserved word list as you did.

You could approach this from the other way round, instead of slicing out a copy, create a new list to start with and append:

mylist=[6.2,5.9,4.8,6.1,6.1,6.5,5.9,5.8,6.2]
mynewlist = [] 
for a in mylist:
    if a>=6.0:
       mynewlist.append(a)
print(mynewlist)

Output:
[6.2, 6.1, 6.1, 6.5, 6.2]

I think it is a good idea to preserve the original list for later use perhaps.

[deanhystad]

A list comprehension would work well here

values = [6.2, 5.9, 4.8, 6.1, 6.1, 6.5, 5.9, 5.8, 6.2]
print([value for value in values if value > 6])

[logansummers]

Nice thread questions like this are exactly why communities like Python Forum are so helpful for debugging and improving coding skills. When you're stuck on an issue, the best approach is usually to simplify the code, isolate the problem, and test each part step by step instead of trying to fix everything at once.
Also, adding small debug prints or checking variable values during execution can quickly reveal where things are going wrong. That method saves a lot of time and helps you understand the logic better in the long run.
If you can share the exact error or expected vs actual output, it would be much easier for others to give a precise solution 👍