Problem with formated string in OS modul in python [duplicate]

Question

I need help with this problem:

temp = "video.mp4"
way_to_file = r"C:\Users\Lukas\Desktop\auto youtube channel\" + temp

the problem is I close the string and can put it together the string and temp I mean It is not working

error:

Traceback (most recent call last):
  File "<pyshell#42>", line 1, in <module>
    subprocess.call(['hello.py', 'htmlfilename.htm'])
  File "C:\Python34\lib\subprocess.py", line 537, in call
    with Popen(*popenargs, **kwargs) as p:
  File "C:\Python34\lib\subprocess.py", line 858, in __init__
    restore_signals, start_new_session)
  File "C:\Python34\lib\subprocess.py", line 1111, in _execute_child
    startupinfo)
OSError: [WinError 193] %1 is not a valid Win32 application

Answer 1

try instead:

temp = "video.mp4"
way_to_file = "C:\\Users\\Lukas\\Desktop\\auto youtube channel\\" + temp