Lookup table with extension

[ahuang11]

I would expect this to work:

source = FileSource(tables=["penguins.csv"])
for table in source.tables:
    source.get(table)

But instead I get

File [~/repos/lumen/lumen/sources/base.py:653](https://file+.vscode-resource.vscode-cdn.net/Users/ahuang/repos/lumen-llm/~/repos/lumen/lumen/sources/base.py:653), in FileSource._load_table(self, table, dask)
    651 if df is None:
    652     tables = list(self._named_files)
--> 653     raise ValueError(f"Table '{table}' not found. Available tables include: {tables}.")
    654 return df

ValueError: Table 'penguins.csv' not found. Available tables include: ['penguins'].

[philippjfr]

I'm not convinced, tables are named and if you provide a list it simply uses the filename but not the file extension as the name.

[github-actions]

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