How can I drop rows in data frames which contains empty lists?

Use series.str.len() to check the length of elements in the list and then filter out where it equals 0:

df[~df.numbers.str.len().eq(0)]

     name country    numbers
0   Lewis   Spain  [1, 4, 6]
2  Andrew      UK     [3, 5]

Umm check bool

df[df.numbers.astype(bool)]

just check len > 0

df[df['numbers'].str.len()>0]

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