Core Python Programming (2nd Edition)

21 return tuple(myargs)
22
23 def fileArgs(file, mode, args):
24 if args[0] == errno.EACCES and \
25 'access' in dir(os):
26 perms = ''
27 permd = { 'r': os.R_OK, 'w': os.W_OK,
28 'x': os.X_OK}
29 pkeys = permd.keys()
30 pkeys.sort()
31 pkeys.reverse()
32
33 for eachPerm in 'rwx':
34 if os.access(file, permd[eachPerm]):
35 perms += eachPerm
36 else:
37 perms += '-'
38
39 if isinstance(args, IOError):
40 myargs = []
41 myargs.extend([arg for arg in args])
42 else:
43 myargs = list(args)
44
45 myargs[1] = "'%s' %s (perms: '%s')" % \
46 (mode, myargs[1], perms)
47
48 myargs.append(args.filename)
49
50 else:
51 myargs = args
52
53 return tuple(myargs)
54
55 def myconnect(sock, host, port):
56 try:
57 sock.connect((host, port))
58
59 except socket.error, args:
60 myargs = updArgs(args) # conv inst2tuple
61 if len(myargs) == 1: # no #s on some errs
62 myargs = (errno.ENXIO, myargs[0])
63
64 raise NetworkError, \
65 updArgs(myargs, host + ':' + str(port))
66
67 def myopen(file, mode='r'):
68 try:
69 fo = open(file, mode)
70 except IOError, args:
71 raise FileError, fileArgs(file, mode, args)
72
73 return fo
74
75 def testfile():
76
77 file = mktemp()
78 f = open(file, 'w')