This is the (much more efficient) workaround which you're encouraged to use instead - nice one
@CaioLCastro !
Use `concat` a single time outside the loop, rather than multiple times inside it
we use a hybrid approach. Append to a list, and then concat.
res = []
for x in itersomething:
res.append(calculations)
pd.concat(res)
df.append is gruesomely inefficient so maybe it is best to remove