readshapefile fails on certain filenames

まだ誰も着手していません。

Hi,

(Tested with basemap 1.0.6)

This works:

`m.readshapefile('foo.shp', 'my_shape')`

while this fails:

`m.readshapefile('bar_0.1.shp', 'my_shape')`

```
raise IOError('error reading shapefile %s.shp' % shapefile)
fields = shf.fields
coords = []; attributes = []

IOError: error reading shapefile bar_0.1.shp
```

Note that foo.shp and bar_0.1.shp are exactly the same file except for the filename. So it seems that the additional `.` causes the problem. Minimal example to reproduce behavior:

Rename `huralll020.{shp,dfb,shx}` to `huralll020_0.1.{shp,dbf,shx}` and change filename in `examples/hurrtracks.py` accordingly. Run hurrtracks.py.

Of course the obvious workaround is not to use `.` in filenames. But this is somewhat impracticable as I have a large number or files and would like keeping the filenames consistent accross filetypes (netCDF, shapfiles, pngs, etc).

Is there an easy fix?

Thanks very much,

Andy

readshapefile エントリポイントと examples/hurrtracks.py の再現から始めます。説明されているとおりに huralll020 の shapefile コンポーネントの名前を変更し、hurrtracks.py を実行して、ドットを含むファイル名が失敗する理由を追跡します。同じ shapefile を huralll020_0.1 のようなファイル名で読み込め、既存の例も引き続き動作すれば完了です。

索引モデルが issue の本文から書いたものです。