46 lines
1.2 KiB
Plaintext
46 lines
1.2 KiB
Plaintext
---
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title: align_left (v0.31)
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description: API reference for qiskit.pulse.builder.align_left in qiskit v0.31
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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.pulse.builder.align_left
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---
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<span id="qiskit-pulse-builder-align-left" />
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# qiskit.pulse.builder.align\_left
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<Function id="qiskit.pulse.builder.align_left" isDedicatedPage={true} github="https://github.com/qiskit/qiskit/tree/stable/0.18/qiskit/pulse/builder.py" signature="align_left()">
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Left alignment pulse scheduling context.
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Pulse instructions within this context are scheduled as early as possible by shifting them left to the earliest available time.
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Examples:
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```python
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from qiskit import pulse
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d0 = pulse.DriveChannel(0)
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d1 = pulse.DriveChannel(1)
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with pulse.build() as pulse_prog:
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with pulse.align_left():
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# this pulse will start at t=0
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pulse.play(pulse.Constant(100, 1.0), d0)
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# this pulse will start at t=0
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pulse.play(pulse.Constant(20, 1.0), d1)
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pulse_prog = pulse.transforms.block_to_schedule(pulse_prog)
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assert pulse_prog.ch_start_time(d0) == pulse_prog.ch_start_time(d1)
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```
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**Yields**
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None
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**Return type**
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`AbstractContextManager`\[`None`]
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</Function>
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