import os,socket,errno,types,tempfile

class NetworkError(IOError):

pass

class FileError(IOError):

pass

def updArgs(args,newarg=None):

if isinstance(args,IOError):

myargs =[]

myargs.extend([arg for arg in args])

else:

myargs = list(args)

if newarg:

myargs.append(newarg)

return tuple(myargs)

def fileAargs(file,mode,agrs):

if args[0] == errno.EACCES and \

'access' in dir(os):

perms = ''

perms = {'r':os.R_OK,'w':os.W_OK,'x':os.X_OK}

pkeys = permd.keys()

pkeys.sort()

pkeys.reverse()

for eachPerm in 'rwx':

if os.access(file,permd[eachPerm]):

perms += eachPerm

else:

perms += '-'

if isinstance(args,IOError):

myargs = []

myargs.extend([arg for arg in args])

else:

myargs = list(args)

myargs[1] = "'%s' %s (perms:'%s')" % (mode,myargs[1],perms)

myargs.append(args.filename)

else:

myargs = args

return tuple(myargs)

def myconnnect(sock,host,port):

try:

sock.connect((hosy,port))

except socket.error,args:

myargs = updArgs(args)

if len(myargs) == 1:

myargs = (errno.ENXIO,myargs[0])

raise NetworkError,\

updArgs(myargs,host +":" + str(port))

def myopen(file,mode ="r"):

try:

fo = open(file,mode)

except IOError,args:

raise FileError,fileArgs(file,mode,args)

return fo

def testfile():

file = mkdtemp()

f = open(file,"w")

f.close()

for eachTest in ((0,"r"),(0100,"r"), \

(0400,"w"),(0500,"w")):

try:

os.chmod(file,eachTest[0])

f=myopen(file,eachTest[1])

except FileError,args:

print "%s: %s" % \

(args.__class__.__name__,args)

else:

print file,"open ok..perm ignored"

f.close()

os.chmod(file,0777)

os.unlink(file)

def testnet():

s = socket.socket(socket.AF_INET.socket.SOCK_STREAM)

for eachHost in ("deli","www"):

try:

myconnect(s,"deli",8080)

except NetworkError,args:

print "%s:%s" %\

(args.__class__.__name__,args)

if __name__ == "__main__":

testfile()

testnet()