How to fix this problem?

Question

---------------------------------------------------------------------------
IndexError Traceback (most recent call last)
<ipython-input-24-74bdaa34e63b> in <module>
1 r=[[None]*20]
----> 2 r[1] = "180110_SJH_EEG.bdf"
3 raw[1] = mne.io.read_raw(r[1], preload=True)
4 r[2]="171102_KCY_EEG.bdf"
5 raw[2] = mne.io.read_raw(r[2], preload=True)

IndexError: list assignment index out of range

Answer 1

Change line 1 from
r=[[None]*20]
to
r = [[None] for _ in range(20)]
or
r = [None]*20

r=[[None]*20]
Is
[[None, None, None,...]]
Not
[[None], [None], [None],...]