Errors when I start the Python shell, errors from a script I ran a week ago
Question: I've been learning python and I there is a problem with my Python interactive
shell on one of my systems. It runs a script on every python-interactive-mode
start(without arguments). I don't know where to look for a process that does
this, I've programmed a lot of small scripts on this system, and I can see
what script is messing around,

When I do this:

    
    
    user@Host ~/Python Scripts> python
    

I get:

    
    
    Python 3.4.2 (default, Feb 21 2015, 22:19:02) 
    [GCC 4.9.2 20150212 (Red Hat 4.9.2-6)] on linux
    Type "help", "copyright", "credits" or "license" for more information.
    # ! / u s r / b i n / e n v   p y t h o n 
     finished
    Failed calling sys.__interactivehook__
    Traceback (most recent call last):
      File "/usr/local/opt/python-3.4.2/lib/python3.4/site.py", line 396, in register_readline
        import rlcompleter
      File "/usr/local/opt/python-3.4.2/lib/python3.4/rlcompleter.py", line 161, in <module>
        readline.set_completer(Completer().complete)
    AttributeError: 'module' object has no attribute 'set_completer'
    >>> quit()
    

Here is the file I ran, and is run on every python start:

    
    
    #!/usr/bin/env python
    
    try:
        number = int(input("Enter a number: "))
        print(number)
        aFile = open('modules.py')
        for i in aFile:
            print(aFile.readline(), end=' ')
    
    except ValueError:
        print('Not a number, please re-enter:')
        number = int(input('Enter a number: '))
        print(number)
    
    except IOError:
        print('Cannot open file')
    
    print('finished')
    

What is causing this and how do I fix it?

EDIT #1

The system is Fedora 21, the file modules.py and the script that runs on start
of the interactive shell are scripts that have never been edited on a Windows
system.

The system has not been rebooted for 11 day's.

Here is:

    
    
    ~/Python Scripts> file tryexcept.py
    tryexcept.py: Python script, ASCII text executable
    

EDIT #2

I have a readline.py in my current working directory:

    
    
    ~/Python Scripts> ls | grep readline
    readline.py
    


Answer: The last part of `rlcompleter.py` trys to import readline and then runs the
line you error on.

    
    
    try:
        import readline
    except ImportError:
        pass
    else:
        readline.set_completer(Completer().complete)
        # Release references early at shutdown (the readline module's
        # contents are quasi-immortal, and the completer function holds a
        # reference to globals).
        atexit.register(lambda: readline.set_completer(None))
    

There must be a `readline.py` file somewhere in your path that you are
importing instead of the actual python module. If you don't have a readline.py
but once had then look for a `readline.pyc` file.

Put a `import readline;print(readline.__file__)` in your interpreter and see
what exactly you are importing

