How to use the humanize.filesize.naturalsize function in humanize

def _updateDisplay(self, modulo=1):
        self.displayCounter += 1
        if self.displayCounter % modulo != 0:
            return
        fileName = self._getFileNameDisplayString()
        if self.fileSize is None:
            displayString = "{}   bytes received: {}\r"
            bytesReceived = humanize.filesize.naturalsize(
                self.bytesReceived)
            self.stream.write(displayString.format(
                fileName, bytesReceived))
        else:
            # TODO contentlength seems to slightly under-report how many
            # bytes we have to download... hence the min functions
            percentage = min(self.bytesReceived / self.fileSize, 1)
            numerator = humanize.filesize.naturalsize(
                min(self.bytesReceived, self.fileSize))
            denominator = humanize.filesize.naturalsize(
                self.fileSize)
            displayString = "{}   {:<6.2%} ({:>9} / {:<9})\r"
            self.stream.write(displayString.format(
                fileName, percentage, numerator, denominator))
        self.stream.flush()

def _updateDisplay(self, modulo=1):
        self.displayCounter += 1
        if self.displayCounter % modulo != 0:
            return
        fileName = self._getFileNameDisplayString()
        if self.fileSize is None:
            displayString = "{}   bytes received: {}\r"
            bytesReceived = humanize.filesize.naturalsize(
                self.bytesReceived)
            self.stream.write(displayString.format(
                fileName, bytesReceived))
        else:
            # TODO contentlength seems to slightly under-report how many
            # bytes we have to download... hence the min functions
            percentage = min(self.bytesReceived / self.fileSize, 1)
            numerator = humanize.filesize.naturalsize(
                min(self.bytesReceived, self.fileSize))
            denominator = humanize.filesize.naturalsize(
                self.fileSize)
            displayString = "{}   {:<6.2%} ({:>9} / {:<9})\r"
            self.stream.write(displayString.format(
                fileName, percentage, numerator, denominator))
        self.stream.flush()