从线程获取返回-返回类型为dataframe

Question

there is thread in my program which calls a function which returns multiple values it also contains a dataframe how can i get these values? the thread is called from a for loop

   ml1234=threading.Thread(target=load_syscom_ascii(fleName=fl, columns=self.cols, finalcsv=self.finalcsv,
                                                       out=self.outdir))
                        ml1234.start()
                        head, dfg, df1 =ml1234.join()

Answer 1

First of all, you shouldn't call the target function when creating a Thread object, pass the function and args separately, like:

ml1234 = threading.Thread(target=load_syscom_ascii, kwargs={'fileName': fl, 'columns': self.cols, 'finalcsv': self.finalcsv, 'out': self.outdir})

Otherwise the function will be called in the main thread immediately.

The ways to get return values from the thread are listed in this answer - how to get the return value from a thread in python? , as was already suggested.