a = [0]*5
for i in range(0, 4):
for j in range(0, i):
a[i].append(j)
why the above codes show the following error. and how to overcome it.
Traceback (most recent call last):
File "<pyshell#10>", line 3, in <module>
a[i].append(j)
AttributeError: 'int' object has no attribute 'append'
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