lenx = []

lenx.append(0)
lenx.append(1)
lenx.append(2)
lenx.append(3)
print (lenx)

xue = []
for fen in range(2,9):
    xue.append(fen)

    print(xue)

feng = [xin for xin in range (2,21) if xin % 2==1]
print(feng)