如何测试编辑一个TypeError

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#1 Created at ... [Delete] [Delete and Lock User]

def product(x): if x is None: print('TypeError') return sum=1 for n in x: sum=sumn return sum

#2 Created at ... [Delete] [Delete and Lock User]

#上面那个有问题

def product(x): if x is None: return TypeError sum=1 for n in x: sum=sumn return sum

#3 Created at ... [Delete] [Delete and Lock User]

我记得之前的教程好像出现过

#4 Created at ... [Delete] [Delete and Lock User]

星号被吞了