> Like Victor says, that opens him up to race conditions.
Slim chance, it's no more possible than it happening in the time try/except
takes to recover an alternative procedure.
with open('in_file') as in_file, open('out_file', 'ab') as outfile_file:
if os.path.getsize('out_file'):
print('file not empty')
else:
#write header
print('file was empty')
And if that's still not acceptable (you did say new) than open the out_file
'r+' an seek
and read to check for a header.
But if your file is not new and lacks a header, then what?
jlc
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