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Import an optional dependency.
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By default, if a dependency is missing an ImportError with a nice
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Parameters
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----------
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name : str
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The module name.
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extra : str
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Additional text to include in the ImportError message.
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errors : str {'raise', 'warn', 'ignore'}
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What to do when a dependency is not found or its version is too old.
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Warns that the version is too old and returns None
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min_version : str, default None
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Specify a minimum version that is different from the global pandas
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minimum version required.
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Returns
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-------
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maybe_module : Optional[ModuleType]
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The imported module, when found and the version is correct.
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None is returned when the package is not found and `errors`
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