An integer is required? open()

user_125946 0
Viewed 97872

I have a very simple python script that should scan a text file, which contains lines formatted as id='value' and put them into a dict. the python module is called chval.py and the input file is in.txt. here's the code:

import os,sys
from os import *
from sys import *

vals = {}

f = open(sys.argv[1], 'r')

for line in val_f:
    t = line.split('=')
    t[1].strip('\'')
    vals.append(t[0], t[1])

print vals

f.close()

when i try to run it i get:

Traceback (most recent call last):
File "chval.py", line 9, in ? f = open(sys.argv[1], 'r') TypeError: an integer is required

I'm using python 2.4... because i've been challenged to not use anything newer, is there something about open() that I don't know about? Why does it want an integer?

anything after that line is untested. in short: why is it giving me the error and how do i fix it?

file-io argv integer python
7 Answers

Because you did from os import *, you are (accidenally) using os.open, which indeed requires an integer flag instead of a textual "r" or "w". Take out that line and you'll get past that error.

user_1260420

Don't do import * from wherever without a good reason (and there aren't many).

Your code is picking up the os.open() function instead of the built-in open() function. If you really want to use os.open(), do import os then call os.open(....). Whichever open you want to call, read the documentation about what arguments it requires.

user_842700

Also of note is that starting with Python 2.6 the built-in function open() is now an alias for the io.open() function. It was even considered removing the built-in open() in Python 3 and requiring the usage of io.open, in order to avoid accidental namespace collisions resulting from things such as "from blah import *". In Python 2.6+ you can write (and can also consider this style to be good practice):

import io
filehandle = io.open(sys.argv[1], 'r')
Wheat_701420

Providing these parameters resolved my issue:

with open('tomorrow.txt', mode='w', encoding='UTF-8', errors='strict', buffering=1) as file:
    file.write(result)
user_35457190

that's because you should do:

open(sys.argv[2], "w", encoding="utf-8")

or

open(sys.argv[2], "w")
user_2360620

you have from os import * I also got the same error, remove that line and change it to import os and behind the os lib functions, add os.[function]

user_170229140
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