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i am using Ubuntu 16.04 on vitualbox on windows10 my opencv version is 3.2 and i am using python 2.7 i could check that my webcam work on unbuntu with cheese but once i run my python script, an error returns. and i found it out that it is because the system cannot find any camera available. here is my code is there any idea to resolve this?? i need a help .

i am using Ubuntu 16.04 on vitualbox on windows10 my opencv version is 3.2 and i am using python 2.7 i could check that my webcam work on unbuntu with cheese but once i run my python script, an error returns. and i found it out that it is because the system cannot find any camera available. here is my code is there any idea to resolve this?? i need a help .help