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Error in Assertion failed (!empty()) mean. the file is empty becasue you didn't add to data parameter.

def callback(self,**data**)

But how do you called function of callback This doesn't do anything.

if __name__ == '__main__':
    main(sys.argv)

You need filename like this:

if __name__ == '__main__':
    x= image_converter()
    filename = x.callback(filename)

Error in Assertion failed (!empty()) mean. the file is empty becasue you didn't add to data parameter.

def callback(self,**data**)
callback(self,data)

But how do you called function of callback This doesn't do anything.

if __name__ == '__main__':
    main(sys.argv)

You need filename like this:

if __name__ == '__main__':
    x= image_converter()
    filename = x.callback(filename)

Error in Assertion failed (!empty()) mean. the file is empty becasue you didn't add to data parameter.

def callback(self,data)

But how do you called function of callback This doesn't do anything.

if __name__ == '__main__':
    main(sys.argv)

You need filename like this:

if __name__ == '__main__':
    x= image_converter()
    filename = x.callback(filename)