Q:

How to compress a tar file in a tar.gz without directory? 

I'm looking for a way to compress a tar file in a tar.gz without directory. 
Today my code generate a TAR file without directory with "tarfile" library and arcname arguments but when I want to compress this TAR file in TAR.GZ I don't understand how to delete directory.  
I have made many tests in the last 3 days. 
My code :
Tarname = example.tar
ImageDirectory = C:\...
TarDirectory = C:\..

tar = tarfile.open(Tarname, "w")
tar.add(ImageDirectory,arcname=TarName)
tar.close()

targz = tarfile.open("example.tar.gz", "w:gz")
targz.add(TarDirectory, arcname=TarName)
targz.close()

A:

For individual file(s):
tar.add(file, arcname=os.path.basename(file))

for each file that you want to add.   basename will strip the directory information. 
Or, for a recursive directory:
def flatten(tarinfo):
    tarinfo.name = os.path.basename(tarinfo.name)
    return tarinfo

tar = tarfile.open("example.tar.gz", "w:gz")
tar.add("directory", filter=flatten)
tar.close()

