urgent question, about filesystem-files

[bvidinli]

i started python programming a few months ago.

now i need the code to understand if a file already opened in
filesystem by another process ?

i looked at docs, howtos, but did not find related info.
note that normal file open/write operations in python, i know it.

i specificly need to know that "is a file already open by some other
process other than python".


Thank you in advance