Python IOError：[Errno 13] linux 中的权限被拒绝？

Question

I want to write string character to file, but i get error like this IOError: [Errno 13] Permission denied: '/python/add.txt' . how to solve this?

this is my code

q = open('/python/add.txt','r')
a = ['123', '234', '456']
lst = []
for line in q:
    for word in a:
        if word in line:
            line = line.replace(word + "\n",'')
    lst.append(line)
q.close()
z = open(r'/python/add.txt','w+')
for line in lst:
    z.write(line)
z.close()

Answer 1

You are trying to write into a folder called "python" at the root level of the filesystem. This is likely not allowed.

I am guessing you have accidentally put a / at the beginning of your file path (making it absolute), when you meant to write "python/add.txt" , which is a relative file path.

You should also use the with construct when opening files, to ensure they are closed afterwards.

Cleaner version using with syntax and better variable names:

add_file_path = 'python/add.txt'
words_to_replace = ['123', '234', '456']
replaced_lines = []
with open(add_file_path, 'r') as f:
    for line in f:
        for word in words_to_replace:
            if word in line:
                line = line.replace(word + "\n",'')
        lst.append(line)

with open(add_file_path, 'w+') as f:
    for line in replaced_lines:
        f.write(line)