Python Directory and File Create Error

[basic_learner]

I am trying to create a Directory (or say, Folder) under the "/tmp/" path.

There, I want to create a Writable Binary file and dump some data. I was doing that in the following way, but neither the Directory nor the File is getting created.

...
fnamehead,fnametail=os.path.split(name) #'name' contains a arbitrary filepath
fname='/tmp/'+fnametail
os.makedirs(os.path.dirname(fname))

with open ('xyz','ab') as fd:
	fd.write(data)
...

Please help me with that.