weird result trying to remove numbers from a list

[perfringo]

In general, when do you use isinstance() and when do you use ==?

They accomplish quite a different tasks:

- == compares values of two objects for equality Documentation >> The Python Language Reference >> 6. Expressions >> 6.10.1 Value Comparisons
- isinstance([i]object, classinfo[/i]) checks whether object is instance of class (or subclass) (instance of class is fancy way to say what type the object is - int, float, list etc).

You use former if you need to check equality:

>>> a = 42
>>> a == 42
True
>>> a == 43
False

You use latter for identity. As in this task - you want to eliminate all integers regardless of the value, so you check whether object is integer and act accordingly.

>>> a = 42
>>> isinstance(a, int)
True
>>> isinstance(a, float)
False
>>> isinstance(a, (int, float))
True