#837577: note cryptic return value of spawn*e on invalid env dicts.
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@ -1753,7 +1753,9 @@ written in Python, such as a mail server's external command delivery program.
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which is used to define the environment variables for the new process (they are
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used instead of the current process' environment); the functions
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:func:`spawnl`, :func:`spawnlp`, :func:`spawnv`, and :func:`spawnvp` all cause
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the new process to inherit the environment of the current process.
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the new process to inherit the environment of the current process. Note that
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keys and values in the *env* dictionary must be strings; invalid keys or
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values will cause the function to fail, with a return value of ``127``.
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As an example, the following calls to :func:`spawnlp` and :func:`spawnvpe` are
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equivalent::
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