Python - IOError：[Errno 13]权限被拒绝： [英] Python - IOError: [Errno 13] Permission denied:

问题描述

我收到 IOError：[Errno 13]权限被拒绝我不知道这段代码有什么问题。

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

我正在尝试读取给定绝对路径的文件（意味着只有 file.asm ），

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

和一个相对路径（意思是 /.../ file.asm ），我希望程序将文件写入给定的路径 - 如果是是绝对的，它应该把它写到当前的目录;否则，到给定的路径。

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.

代码：

#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

错误给定：

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

我执行代码的方式：

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

我在这里做错了什么？

推荐答案

看起来您正在尝试使用以下代码替换扩展名：

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

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

但是，您似乎混淆了数组索引。请尝试以下方法：

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

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

注意使用 -4 而不是第二行代码中的 4 。这解释了为什么你的程序试图创建 /Use.hack ，这是文件名的第一个四个字符（ /使用），附加 .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.

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