Working with files

Dev Shed Forums Sponsor:

January 25th, 2004, 07:31 PM

XxChris

Registered User

Join Date: Aug 2003

Posts: 217

Time spent in forums: < 1 sec
Reputation Power: 0

Working with files

I'm not sure why this doesn't work. It's pretty simple... just tests if it can read/write the file.

Code:

#! /usr/bin/env python

import sys

class FileCheck:
	def check(self, filename):
		try:
			fp = open("filename", "r")		
			print "Can read from " + filename
			fp.close()
		except:
			print "Cannot read from " + filename
		
		try:
			fp = open("filename", "w")
			print "Can write from " + filename
			fp.close()
		except:
			print "Cannot read from " + filename

def main():
	file = FileCheck()	

	if len(sys.argv) != 2:
		print "Usage: ./filecheck <path/filename>"
	else:
		file.check(sys.argv[1])
		
if __name__ == "__main__":
	main()

January 25th, 2004, 10:36 PM

SolarBear

onCsdfeu

Join Date: Jul 2003

Location: Canada

Posts: 100

Time spent in forums: 2 h 16 m 21 sec
Reputation Power: 10

What error do you get ? Your script worked when I tried it (under Win XP though).

January 25th, 2004, 10:46 PM

XxChris

Registered User

Join Date: Aug 2003

Posts: 217

Time spent in forums: < 1 sec
Reputation Power: 0

When I give it a filename that doesn't exist it still says it can read/write. When I type "fp =open("oiwjedoiwjed", "r") directly into the interpreter, I get an exception. But in my program the except: stuff doesn't run...

January 26th, 2004, 06:45 AM

netytan

Hello World :)

Join Date: Mar 2003

Location: Hull, UK

Posts: 2,537

Time spent in forums: 1 Week 2 Days 18 h 17 m 47 sec
Reputation Power: 68

Could have somthing to do with the filename you passing to your files. instead of using the variable 'filename' your passing in a string "filename"

Quote:

C:\Documents and Settings\Mark>cd desktop

C:\Documents and Settings\Mark\Desktop>checkfile.py new.txt
Can read from <open file 'new.txt', mode 'r' at 0x008F6F60>
Can write to <open file 'new.txt', mode 'w' at 0x008F6F60>

Code:

#!/usr/bin/env python

def check(path):
	
	"""
	Check a path to see if the file is readable/writable or not.
	"""
	
	try:
		print 'Can read from', file(path, 'r')
	except IOError:
		print 'Cannot read from', path
	
	try:
		print 'Can write to', file(path, 'w')
	except IOError:
		print 'Cannot write to', path

if __name__ == "__main__":
	
	import sys	
	
	if len(sys.argv) != 2:
		print 'Usage: ./filecheck <path/filename>'	
	else:
		check(sys.argv[1])

changed things around and it worked fine.. oh