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A Unix timestamp with optional nanoseconds precision,
modulo 2**31 seconds.
A 3-tuple containing:
`truncated_seconds`: seconds since the Unix epoch,
truncated to its lower 31 bits
`subsecond_nanoseconds`: number of nanoseconds since `truncated_seconds`.
When this is zero, the sub-second precision is considered unknown.
`second_ambiguous`: whether this timestamp is still "reliable"
(see `reliable_mtime_of`) if we drop its sub-second component.
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__classcell__r r r r r s r c C sL | � � \}}z$tt�|��W t�|� | �|� S t�|� | �|� 0 dS )z~return a timestamp for "now" in the current vfs
This will raise an exception if no temporary files could be created.
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Returns the `timestamp` at the Unix epoch.
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Takes an `os.stat_result`-like object and returns a `timestamp` object
for its modification time.
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r c C sz t | �}|d }|d }|d }|d }||krR|rN|rN||k rNt||df�S dS || k rjd| k rrn ndS |S dS )a4 Same as `mtime_of`, but return `None` or a `Timestamp` with
`second_ambiguous` set if the date might be ambiguous.
A modification time is reliable if it is older than "present_time" (or
sufficiently in the future).
Otherwise a concurrent modification might happens with the same mtime.
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