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Remove a file descriptor being tracked by a polling object. Just like the register() method, fd can be an integer or an object with a fileno() method that returns an integer.

Attempting to remove a file descriptor that was never registered is safely ignored.

Polls the set of registered file descriptors, and returns a possibly-empty list containing (fd, event) 2-tuples for the descriptors that have events or errors to report. fd is the file descriptor, and event is a bitmask with bits set for the reported events for that descriptor — POLLIN for waiting input, POLLOUT to indicate that the descriptor can be written to, and so forth. An empty list indicates that the call timed out and no file descriptors had any events to report. If timeout is given, it specifies the length of time in milliseconds which the system will wait for events before returning. If timeout is omitted, -1, or For Cheap Price Pictures Sale Online School shoes girl for girls nice Outlet For Nice bYcFbR
, the call will block until there is an event for this poll object.

Changed in version 3.5: The function is now retried with a recomputed timeout when interrupted by a signal, except if the signal handler raises an exception (see PEP 475 for the rationale), instead of raising .

https://linux.die.net/man/4/epoll

Close the control file descriptor of the epoll object.

True if the epoll object is closed.

Return the file descriptor number of the control fd.

Create an epoll object from a given file descriptor.

Register a fd descriptor with the epoll object.

Modify a registered file descriptor.

Remove a registered file descriptor from the epoll object.

Wait for events. timeout in seconds (float)

Changed in version 3.5: The function is now retried with a recomputed timeout when interrupted by a signal, except if the signal handler raises an exception (see PEP 475 for the rationale), instead of raising .

The poll() system call, supported on most Unix systems, provides better scalability for network servers that service many, many clients at the same time. poll() scales better because the system call only requires listing the file descriptors of interest, while select() builds a bitmap, turns on bits for the fds of interest, and then afterward the whole bitmap has to be linearly scanned again. select() is O(highest file descriptor), while poll() is O(number of file descriptors).

A reading of 8,000m, with trailing zeroes and no decimal point, is ambiguous; the trailing zeroes may or may not be intended as significant figures. To avoid this ambiguity, the number could be represented in scientific notation: 8.0×10 3 m indicates that the first zero is significant (hence a margin of 50m) while 8.000×10 3 m indicates that all three zeroes are significant, giving a margin of 0.5m. Similarly, it is possible to use a multiple of the basic measurement unit: 8.0km is equivalent to 8.0×10 3 m. In fact, it indicates a margin of 0.05km (50m). However, reliance on this convention can lead to Enjoy Online dress shoes made in china custom logo sport branded Cheap Reliable Pay With Visa Sale Online Cheap Sale 2018 Newest Outlet Where Can You Find Yyt2iiskgq
errors when accepting data from sources that do not obey it. For example, a source reporting a number like 153,753 with precision +/- 5,000 looks like it has precision +/- 0.5. Under the convention it would have been rounded to 154,000.

Precision includes:

According to ISO 5725-1, Accuracy consists of Trueness (proximity of measurement results to the true value) and Precision (repeatability or reproducibility of the measurement)

A shift in the meaning of these terms appeared with the publication of the ISO 5725 series of standards in 1994, which is also reflected in the 2008 issue of the "BIPM International Vocabulary of Metrology" (VIM), items 2.13 and 2.14. sailor lolita fashion clothing Cheap Explore Where To Buy Low Price E4crcDTVbQ

According to ISO 5725-1, [5] the general term " accuracy " is used to describe the closeness of a measurement to the true value. When the term is applied to sets of measurements of the same measurand , it involves a component of random error and a component of systematic error. In this case trueness is the closeness of the mean of a set of measurement results to the actual (true) value and precision is the closeness of agreement among a set of results.

ISO 5725-1 and VIM also avoid the use of the term "", previously specified in BS 5497-1, [6] because it has different connotations outside the fields of science and engineering, as in medicine and law.

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Accuracy is also used as a statistical measure of how well a Amazing Shop Sexy MM Summer Style Flats Woman Flat Loafers SlipOn Shoes Outlet Amazing Price Top Quality jx415Em4W
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[9] [10] It is a parameter of the test.

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