Solve numpy core._ exceptions. Ufunctypeerror: UFUNC 'Add' did not contain a loop with signature matching

Recently, we are testing the distribution project , Manually calculate the distributor's commission each time , It's very troublesome , So I want to use python To automatically calculate commissions , But there is a problem in the calculation , as follows ：

Problem description

Pictured , When calculating and adding the Commission matrix , numpy Threw an exception , There is no relevant information about this anomaly on the Internet .

So I interrupted to have a look , It is found that when calculating , list Data in , The return is str type , When the matrix is added , The calculation failed .

Then I went to have a look at the code of commission calculation rules written by myself , If the commission amount in the demand is greater than two decimal places , The data will be rounded to two decimal places , But the data type with two decimal places becomes str Type , Then I change the data type to float, The problem will be solved ~ Pictured ：

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