Fix pandas copy/slice warning.

[Pedroski55]

Probably this won't help you, I don't know pandas. I was just looking at your code, trying to learn a bit about pandas.

If I assign:

description = supplier_table["Description"] 
type(description)
<class 'pandas.core.series.Series'>

Try split() on description:

description.split()
Traceback (most recent call last):
  File "/usr/lib/python3.10/idlelib/run.py", line 578, in runcode
    exec(code, self.locals)
  File "<pyshell#35>", line 1, in <module>
  File "/home/pedro/.local/lib/python3.10/site-packages/pandas/core/generic.py", line 5902, in __getattr__
    return object.__getattribute__(self, name)
AttributeError: 'Series' object has no attribute 'split'. Did you mean: 'plot'?

This works however, using your function find_supplier(description) :

supplier_table["Description"].map(find_supplier)
0     B
3     D
4     A
6     B
7     C
9     D
11    E
14    D
16    D
18    D
19    E
Name: Description, dtype: object

This, oddly, does not work, with the same AttributeError: 'Series' object has no attribute 'split'. Did you mean: 'plot'?:

intersection = set(description.split()) & suppliers
Traceback (most recent call last):
  File "/usr/lib/python3.10/idlelib/run.py", line 578, in runcode
    exec(code, self.locals)
  File "<pyshell#39>", line 1, in <module>
  File "/home/pedro/.local/lib/python3.10/site-packages/pandas/core/generic.py", line 5902, in __getattr__
    return object.__getattribute__(self, name)
AttributeError: 'Series' object has no attribute 'split'. Did you mean: 'plot'?

So, because your code works, you CAN split() description, AND you shouldn't be able to split() description!