Python. Why does the number of tabs per line change when reading a file?

Question

Python

Hello!
I'm trying to write a plugin for Sublime-text. Unfortunately I don't know Python.
Here is what I have:

import os
import sublime
import sublime_plugin

class testPluginCommand(sublime_plugin.TextCommand):
    def run(self, edit):
        path = os.path.dirname(os.path.realpath(__file__))
        file = open(path + '/text.pattern', 'r')

        result = ''
        for line in file:
            result += line
            # result += line.expandtabs(4) # не помогает

        # помещает полученную строку в редактор
        self.view.run_command("insert", {"characters": result})

File text.pattern

A is inserted into the editor into this:

Reading the entire file result= open(path + '/text.pattern', 'r').read()produces the same result.
Please tell me what can be done?

Answer 1

Issue resolved. It's all about sublime settings.
Should have been exposed"auto_indent": false,