theskumar / python-dotenv / 341

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fix bug: DotEnv._get_stream raise IOError when  `.env` is a directory rather than a file (#120)

# How this bug happened ?

The function `find_dotenv` try to find a file named `.env`, if there is a directory named `.env` by coincidence, then `DotEnv._get_stream` will  raise IOError.

# Fix this bug

use `os.path.isfile` instead of `os.path.exists`.

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