Delete lines containing a specific word

[Francesco Pietra]

Please, how to adapt the following script (to delete blank lines) to delete
lines containing a specific word, or words?

f=open("output.pdb", "r")
for line in f:
	line=line.rstrip()
	if line:
		print line
f.close()

If python in Linux accepts lines beginning with # as comment lines, please also
a script to comment lines containing a specific word, or words, and back, to
remove #.

Thanks
francesco pietra


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