New submission from Mor Haviv <morhavi...@gmail.com>:

I uploaded this as a question on Stack Overflow and I suspect it might be a 
bug. Here is the link for the Stack Overflow question: 
https://stackoverflow.com/questions/46608731/python-os-path-isdir-returns-true-for-dots/46608842#46608842

The problem itself (copied from what I uploaded on Stack Overflow):

I'm programming my own shell in python. Right now I'm trying to implement the 
`cd` command to my shell.

The function that performs this command has several variables:

`self.current_dir = "C:\\"` - The default value, it changes depends on the 
user's input using the cd command

`dir = "..."` - The requested directory that the user types. "..." is an 
example for an input that causes the problem.

Here is my code:

    def command_cd(self, dir):
        if os.path.isdir(self.shell.current_dir + dir):
            self.shell.current_dir = self.shell.current_dir + dir + "\\"

The problem is that for some strange reason, 
`os.path.isdir(self.shell.current_dir + dir)` returns `True` when the user 
types dots (Just like the example inputs for the variables which I gave above). 

The problem occurs even if you change the amount of dots (even above 5 dots) 
and I really have no idea what causes it.

There's obviously no folder named `...` or anything like it.


**If my problem isn't clear enough please comment and I'll edit it**

----------
components: Windows
messages: 303827
nosy: morha13, paul.moore, steve.dower, tim.golden, zach.ware
priority: normal
severity: normal
status: open
title: os.path.isdir returns true for dots
type: behavior
versions: Python 2.7

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Python tracker <rep...@bugs.python.org>
<https://bugs.python.org/issue31716>
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