Copy traces in a loop OBSPY

Question

I have several traces which I imported from a folder, and I need to copy them for further processing. I was trying to copy them into a loop with the original procedure for copying one trace

for i in range(550):
    tr[i] = st[i].copy()

but it complains that tr is not defined. How can I define tr then? I tried the standard procedure, but not working!

Answer 1

for tr in st:
   tr_copy = tr.copy()