python2：TypeError: must be string without null bytes, not str

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TypeError: must be string without null bytes, not str

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I'm trying to run this code, to run the same command (with little changes) with every frame that I have: traj.reset() import os #os.chdir(outname) for i, frame in enumerate(traj): frame.superpose() comando = "python hollow.py -c constraint -o hollow_%s.pdb urei%s.pdb" % (i, i) os.system(comando) pml_cmd = "pymol urei%s.pdb hollow_%s.pdb -c -d 'as cartoon, urei%s;color gray90, urei%s;center chain A;set_view (\-0.605158150,0.089404292,0.791067421,\0.795849979,0.093013920,0.598304033,\-0.020089993,0.991641700,-0.127439827,\0.000000000,0.000000000,-202.017959595,\-28.771762848,-7.683309555,10.745590210,\-568.485290527,972.520690918,-20.000000000);bg white;as sphere, hollow_%s;color cyan, hollow_%s;ray;save urei%s.png' " % (i, i, i, i, i, i, i) os.system(pml_cmd) #remove = "rm urei%s.pdb hollow_%s.pdb" % (i, i) #os.system(remove) os.chdir("../") I run this and I get this error: TypeError Traceback (most recent call last) <ipython-input-8-53cd3e7bd107> in <module>() 7 os.system(comando) 8 pml_cmd = "pymol urei%s.pdb hollow_%s.pdb -c -d 'as cartoon, urei%s;color gray90, urei%s;center chain A;set_view (\-0.605158150,0.089404292,0.791067421,\0.795849979,0.093013920,0.598304033,\-0.020089993,0.991641700,-0.127439827,\0.000000000,0.000000000,-202.017959595,\-28.771762848,-7.683309555,10.745590210,\-568.485290527,972.520690918,-20.000000000);bg white;as sphere, hollow_%s;color cyan, hollow_%s;ray;save urei%s.png' " % (i, i, i, i, i, i, i) ----> 9 os.system(pml_cmd) 10 #remove = "rm urei%s.pdb hollow_%s.pdb" % (i, i) 11 #os.system(remove) TypeError: must be string without null bytes, not str I searched in internet, but I can't find a good answer. python  null  byte  os.system share improve this question edited  Jun 20 '15 at 14:20 nymk 2,66522233 asked  Aug 16 '13 at 2:51 Javier Cáceres Delpiano 70117

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up vote 3down vote	The problem is with the \ char that should either be double escaped, i.e. changed to "\\" Or alternatively add an "r" before the string decleration: pml_cmd = r"pymol urei%s.pdb ..." You get this particular error since somewhere along the string there is a \0 which is interpreted as a NULL char share improve this answer edited  Feb 5 '14 at 8:25     answered  Feb 5 '14 at 8:19 nvelan 614
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up vote 0down vote	I was able to resolve this error by commenting out the print: for tarfileobj in inputs: # print(tarfileobj) tarfileobj.extractall(path=t, members=None) I could have done print(tarfileobj.split) or printed the repr or removed \0 null bytes, or if its a tarfile, just extract it. share improve this answer answered  Dec 17 '16 at 3:48 jmunsch 6,62233853
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