I’m getting IOError: [Errno 13] Permission denied and I don’t know what is wrong wit this code.

I’m trying to read a file given an absolute path (meaning only file.asm),

and a relative path (meaning /.../file.asm), and I want the program to write the file to whatever path is given – if it is absolute, it should write it to the current dir; otherwise, to the path given.

the code:

#call to main function
if __name__ == '__main__':
    assem(sys.argv[1])


import sys

def assem(myFile):
    from myParser import Parser
    import code
    from symbolTable import SymbolTable

    table=SymbolTable()

    # max size of each word
    WORD_SIZE = 16
    # rom address to save to
    rom_addrs = 0
    # variable address to save to
    var_addrs = 16

    # new addition
    if (myFile[-4:] == ".asm"):
        newFile = myFile[:4]+".hack"

    output = open(newFile, 'w') <==== ERROR

the error given:

IOError: [Errno 13] Permission denied: '/Use.hack'

the way I execute the code :

python assembler.py Users/***/Desktop/University/Add.asm 

What am I doing wrong here?

Just Close the opened file where you are going to write.

It looks like you’re trying to replace the extension with the following code:

if (myFile[-4:] == ".asm"):
    newFile = myFile[:4]+".hack"

However, you appear to have the array indexes mixed up. Try the following:

if (myFile[-4:] == ".asm"):
    newFile = myFile[:-4]+".hack"

Note the use of -4 instead of just 4 in the second line of code. This explains why your program is trying to create /Use.hack, which is the first four characters of your file name (/Use), with .hack appended to it.

You don’t have sufficient permissions to write to the root directory. See the leading slash on the filename?

This happened to me when I was using ‘shutil.copyfile’ instead of ‘shutil.copy’. The permissions were messed up.

I had a same problem. In my case, the user did not have write permission to the destination directory. Following command helped in my case :

chmod 777 University

Maybe You are trying to open folder with open, check it once.

For me nothing from above worked. So I solved my problem with this workaround. Just check that you have added SYSTEM in directory folder. I hope it will help somoene.

import os
# create file
@staticmethod
def create_file(path):
    if not os.path.exists(path):
        os.system('echo # > {}'.format(path))

# append lines to the file
split_text = text_file.split('\n')
    for st in split_text:
        os.system('echo {} >> {}'.format(st,path))

Check if you are implementing the code inside a could drive like box, dropbox etc. If you copy the files you are trying to implement to a local folder on your machine you should be able to get rid of the error.

For me, this was a permissions issue.

Use the ‘Take Ownership’ application on that specific folder.
However, this sometimes seems to work only temporarily and is not a permanent solution.

FYI I had this permission error because the file that it was trying to create was already open/used by another program (was created last time the script was run, I had opened it with excel, and then got a permission error when it was trying to recreate it)

leaving this here in case someone else finds it useful, it is not the real solution to the question asked

I got this error because the directory didn’t exist yet.

Solution: create the directory

import os
if not os.path.exists(directory):
    os.makedirs(directory)