executing php script with python

hello
I am trying to execute a .php file in my script python and i have an error. I would want to know why I have this error:)

subprocess.call("php  files/updatekey.php")

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error

> Traceback (most recent call last):   File "adn/start.py", line 15, in
    > <module>
    >     subprocess.call("php  files/updatekey.php")   File "/usr/lib64/python2.7/subprocess.py", line 524, in call
    >     return Popen(*popenargs, **kwargs).wait()   File "/usr/lib64/python2.7/subprocess.py", line 711, in __init__
    >     errread, errwrite)   File "/usr/lib64/python2.7/subprocess.py", line 1327, in _execute_child
    >     raise child_exception OSError: [Errno 2] No such file or directory

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ty all