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Dear friends can you please help me???

vec = [[1,2,3],[4,5,6],[7,8,9,0]]
print([num for elem in vec for num in elem]) **huh**

what does the second statement meant? Exclamation

It a list expression:
Equal to

vec = [[1,2,3],[4,5,6],[7,8,9,0]]
output = []
for elem in vec:
    for num in elem:
        output.append(num)
print(output)

zowhair