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    serial.Serial() resets Uno and it spends some time in bootloader after then. add a delay/sleep after serial.Serial Commented Nov 21, 2018 at 16:35
  • I dont understand ;so how can I send string in Python as done in hyperTerminal? My Ard code works with hyperTerminal but I have been looking for a day and couldn't find a code which work for Python. Commented Nov 22, 2018 at 11:37
  • you need to wait 2 seconds until sending something over that Serial from python. Serial Monitor resets the Arduino too when opening a connection. At opening of window, not before every sent data Commented Nov 22, 2018 at 11:55