This is possibly the worst way to use `pandas` for this application. A
A `DataFrame` is not a list, it has a certain structure to optimise it for vector operations to avoid looping.
What you're doing, is looping through each entry of a `pandas.Series` (from `df[ 'Country' ]`), storing the market in a separate list and then adding it back into the `DataFrame`.
The `pandas` way to do it is something like this:
if df['Country'] == 'Germany': df['Market'] = 'DACH'
Then repeat for the rest of the parameters. There are neater ways to write this but you get the idea.