Python doctest example failure
Question: This is probably a silly question.

I am experimenting with python doctest, and I try to run
[this](http://docs.python.org/library/doctest.html#simple-usage-checking-
examples-in-a-text-file) example

ending with

    
    
    if __name__ == "__main__":
        import doctest
        doctest.testfile("example.txt")
    

I have put "example.txt" in the same folder as the source file containing the
example code, but I get the following error:

    
    
    Traceback (most recent call last):
    File "test_av_funktioner.py", line 61, in <module>
    doctest.testfile("example.txt")
    File "C:\Python26\lib\doctest.py", line 1947, in testfile
    text, filename = _load_testfile(filename, package, module_relative)
    File "C:\Python26\lib\doctest.py", line 219, in _load_testfile
    return open(filename).read(), filename
    IOError: [Errno 2] No such file or directory: 'example.txt'
    

Can I somehow tell/set where the doctest module is searching for the specified
file?


Answer: Doctest searches relative to the calling module's directory by default (but
you can override this).

Quoting the docs for
[`doctest.testfile`](http://docs.python.org/library/doctest.html#doctest.testfile):

> Optional argument `module_relative` specifies how the filename should be
> interpreted:
>
>   * If `module_relative` is **True** (the default), then `filename`
> specifies an OS-independent module-relative path. By default, this path is
> relative to the calling module’s directory; but if the `package` argument is
> specified, then it is relative to that package. To ensure OS-independence,
> `filename` should use `/` characters to separate path segments, and may not
> be an absolute path (i.e., it may not begin with `/`).
>   * If `module_relative` is **False** , then `filename` specifies an OS-
> specific path. The path may be absolute or relative; relative paths are
> resolved with respect to the current working directory.
>

