Why design like this?

Question

Most of the time, a comma won't follow the last item in a list. However, it is perfectly valid to place one there, and it is encouraged in some cases.

Answer 1

so when adding item at the end, there will not be error because of missing comma

設計上，這樣可以避免error

Answer 2

Sir , How to change
A as [3,2,4] in one line ?
A=[1,2,]
print (type(A))
print (A)
A[???]=(3,4)
print (type(A))
print (A)

Answer 3

唔唔明你想達到甚麼

A[???] = (3,4) 這句
是想最後print出甚麼結果？

Answer 4

怎麽用一條編碼將
A=[1,2,]改成 A=[3,2,4]

Answer 5

A[0] = 3
A.append(4)

Answer 6

有辦法用一行解決嗎