Python - IOError: [Errno 13] Permission denied:

Question

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 ``` Wha…

Accepted Answer

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.

Python - IOError: [Errno 13] Permission denied:

Solution

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