24 lines
955 B
Plaintext
24 lines
955 B
Plaintext
---
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title: MissingOptionalLibraryError
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description: API reference for qiskit.aqua.MissingOptionalLibraryError
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in_page_toc_min_heading_level: 1
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python_api_type: exception
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python_api_name: qiskit.aqua.MissingOptionalLibraryError
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---
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# qiskit.aqua.MissingOptionalLibraryError
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<Class id="qiskit.aqua.MissingOptionalLibraryError" isDedicatedPage={true} github="https://github.com/qiskit-community/qiskit-aqua/tree/stable/0.9/qiskit/aqua/missing_optional_library_error.py" signature="MissingOptionalLibraryError(libname, name, pip_install=None, msg=None)" modifiers="exception">
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Raised when an optional library is missing.
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Set the error message.
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**Parameters**
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* **libname** (`str`) – Name of missing library
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* **name** (`str`) – Name of class, function, module that uses this library
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* **pip\_install** (`Optional`\[`str`]) – pip install command, if any
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* **msg** (`Optional`\[`str`]) – Descriptive message, if any
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</Class>
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