34 lines
848 B
Plaintext
34 lines
848 B
Plaintext
---
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title: count_keys
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description: API reference for qiskit.ignis.verification.count_keys
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in_page_toc_min_heading_level: 1
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python_api_type: function
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python_api_name: qiskit.ignis.verification.count_keys
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---
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# qiskit.ignis.verification.count\_keys
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<Function id="qiskit.ignis.verification.count_keys" isDedicatedPage={true} github="https://github.com/qiskit-community/qiskit-ignis/tree/stable/0.7/qiskit/ignis/verification/tomography/data.py" signature="count_keys(num_qubits)">
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Return ordered count keys.
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**Parameters**
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**num\_qubits** (`int`) – The number of qubits in the generated list.
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**Return type**
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`List`\[`str`]
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**Returns**
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The strings of all 0/1 combinations of the given number of qubits
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**Example**
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```python
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>>> count_keys(3)
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['000', '001', '010', '011', '100', '101', '110', '111']
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```
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</Function>
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