https://github.com/python/cpython/commit/c92a473a71a0c395df57d31cd49900057da3c25b
commit: c92a473a71a0c395df57d31cd49900057da3c25b
branch: 3.11
author: Serhiy Storchaka <storch...@gmail.com>
committer: serhiy-storchaka <storch...@gmail.com>
date: 2024-01-10T13:13:27Z
summary:
[3.11] gh-113664: Improve style of Big O notation (GH-113695) (GH-113910)
Use cursive to make it looking like mathematic formulas.
(cherry picked from commit a8629816c6c0e6770248a60529fd7c9ba08aad55)
files:
M Doc/faq/design.rst
M Doc/glossary.rst
M Doc/library/asyncio-policy.rst
M Doc/library/bisect.rst
M Doc/library/collections.rst
M Doc/library/contextvars.rst
M Doc/library/heapq.rst
M Doc/library/select.rst
M Doc/reference/datamodel.rst
M Doc/using/cmdline.rst
M Doc/whatsnew/2.3.rst
M Doc/whatsnew/2.7.rst
M Doc/whatsnew/3.3.rst
M Misc/NEWS.d/3.5.0a1.rst
diff --git a/Doc/faq/design.rst b/Doc/faq/design.rst
index 83c0152c85e84a..d0c136deabad76 100644
--- a/Doc/faq/design.rst
+++ b/Doc/faq/design.rst
@@ -449,7 +449,7 @@ on the key and a per-process seed; for example, "Python"
could hash to
to 1142331976. The hash code is then used to calculate a location in an
internal array where the value will be stored. Assuming that you're storing
keys that all have different hash values, this means that dictionaries take
-constant time -- O(1), in Big-O notation -- to retrieve a key.
+constant time -- *O*\ (1), in Big-O notation -- to retrieve a key.
Why must dictionary keys be immutable?
diff --git a/Doc/glossary.rst b/Doc/glossary.rst
index ec6cec3acc7939..7dd178d5ad34f9 100644
--- a/Doc/glossary.rst
+++ b/Doc/glossary.rst
@@ -741,7 +741,7 @@ Glossary
list
A built-in Python :term:`sequence`. Despite its name it is more akin
to an array in other languages than to a linked list since access to
- elements is O(1).
+ elements is *O*\ (1).
list comprehension
A compact way to process all or part of the elements in a sequence and
diff --git a/Doc/library/asyncio-policy.rst b/Doc/library/asyncio-policy.rst
index f846f76ca095f4..3cd0f1e9d23cf3 100644
--- a/Doc/library/asyncio-policy.rst
+++ b/Doc/library/asyncio-policy.rst
@@ -226,7 +226,7 @@ implementation used by the asyncio event loop:
It works reliably even when the asyncio event loop is run in a non-main OS
thread.
- There is no noticeable overhead when handling a big number of children
(*O(1)* each
+ There is no noticeable overhead when handling a big number of children
(*O*\ (1) each
time a child terminates), but starting a thread per process requires extra
memory.
This watcher is used by default.
@@ -246,7 +246,7 @@ implementation used by the asyncio event loop:
watcher is installed.
The solution is safe but it has a significant overhead when
- handling a big number of processes (*O(n)* each time a
+ handling a big number of processes (*O*\ (*n*) each time a
:py:data:`SIGCHLD` is received).
.. versionadded:: 3.8
@@ -260,7 +260,7 @@ implementation used by the asyncio event loop:
The watcher avoids disrupting other code spawning processes
by polling every process explicitly on a :py:data:`SIGCHLD` signal.
- This solution is as safe as :class:`MultiLoopChildWatcher` and has the same
*O(N)*
+ This solution is as safe as :class:`MultiLoopChildWatcher` and has the same
*O*\ (*n*)
complexity but requires a running event loop in the main thread to work.
.. class:: FastChildWatcher
@@ -270,7 +270,7 @@ implementation used by the asyncio event loop:
processes and waiting for their termination.
There is no noticeable overhead when handling a big number of
- children (*O(1)* each time a child terminates).
+ children (*O*\ (1) each time a child terminates).
This solution requires a running event loop in the main thread to work, as
:class:`SafeChildWatcher`.
diff --git a/Doc/library/bisect.rst b/Doc/library/bisect.rst
index 75d16dc3e1021c..92372f12ca4425 100644
--- a/Doc/library/bisect.rst
+++ b/Doc/library/bisect.rst
@@ -79,7 +79,7 @@ The following functions are provided:
To support inserting records in a table, the *key* function (if any) is
applied to *x* for the search step but not for the insertion step.
- Keep in mind that the ``O(log n)`` search is dominated by the slow O(n)
+ Keep in mind that the *O*\ (log *n*) search is dominated by the slow *O*\
(*n*)
insertion step.
.. versionchanged:: 3.10
@@ -99,7 +99,7 @@ The following functions are provided:
To support inserting records in a table, the *key* function (if any) is
applied to *x* for the search step but not for the insertion step.
- Keep in mind that the ``O(log n)`` search is dominated by the slow O(n)
+ Keep in mind that the *O*\ (log *n*) search is dominated by the slow *O*\
(*n*)
insertion step.
.. versionchanged:: 3.10
@@ -115,7 +115,7 @@ thoughts in mind:
* Bisection is effective for searching ranges of values.
For locating specific values, dictionaries are more performant.
-* The *insort()* functions are ``O(n)`` because the logarithmic search step
+* The *insort()* functions are *O*\ (*n*) because the logarithmic search step
is dominated by the linear time insertion step.
* The search functions are stateless and discard key function results after
diff --git a/Doc/library/collections.rst b/Doc/library/collections.rst
index a29cc9530390bc..10cd1e8e2f1e1d 100644
--- a/Doc/library/collections.rst
+++ b/Doc/library/collections.rst
@@ -457,10 +457,10 @@ or subtracting from an empty counter.
Deques are a generalization of stacks and queues (the name is pronounced
"deck"
and is short for "double-ended queue"). Deques support thread-safe, memory
efficient appends and pops from either side of the deque with
approximately the
- same O(1) performance in either direction.
+ same *O*\ (1) performance in either direction.
Though :class:`list` objects support similar operations, they are
optimized for
- fast fixed-length operations and incur O(n) memory movement costs for
+ fast fixed-length operations and incur *O*\ (*n*) memory movement costs for
``pop(0)`` and ``insert(0, v)`` operations which change both the size and
position of the underlying data representation.
@@ -584,7 +584,7 @@ or subtracting from an empty counter.
In addition to the above, deques support iteration, pickling, ``len(d)``,
``reversed(d)``, ``copy.copy(d)``, ``copy.deepcopy(d)``, membership testing
with
the :keyword:`in` operator, and subscript references such as ``d[0]`` to access
-the first element. Indexed access is O(1) at both ends but slows to O(n) in
+the first element. Indexed access is *O*\ (1) at both ends but slows to *O*\
(*n*) in
the middle. For fast random access, use lists instead.
Starting in version 3.5, deques support ``__add__()``, ``__mul__()``,
diff --git a/Doc/library/contextvars.rst b/Doc/library/contextvars.rst
index 0ac2f3d85749b7..647832447de946 100644
--- a/Doc/library/contextvars.rst
+++ b/Doc/library/contextvars.rst
@@ -131,7 +131,7 @@ Manual Context Management
ctx: Context = copy_context()
print(list(ctx.items()))
- The function has an O(1) complexity, i.e. works equally fast for
+ The function has an *O*\ (1) complexity, i.e. works equally fast for
contexts with a few context variables and for contexts that have
a lot of them.
diff --git a/Doc/library/heapq.rst b/Doc/library/heapq.rst
index 8b00f7b27959b6..ddbada13bddf5b 100644
--- a/Doc/library/heapq.rst
+++ b/Doc/library/heapq.rst
@@ -270,7 +270,7 @@ winner. The simplest algorithmic way to remove it and find
the "next" winner is
to move some loser (let's say cell 30 in the diagram above) into the 0
position,
and then percolate this new 0 down the tree, exchanging values, until the
invariant is re-established. This is clearly logarithmic on the total number of
-items in the tree. By iterating over all items, you get an O(n log n) sort.
+items in the tree. By iterating over all items, you get an *O*\ (*n* log *n*)
sort.
A nice feature of this sort is that you can efficiently insert new items while
the sort is going on, provided that the inserted items are not "better" than
the
diff --git a/Doc/library/select.rst b/Doc/library/select.rst
index c2941e628d9d78..a0058046d0ce4c 100644
--- a/Doc/library/select.rst
+++ b/Doc/library/select.rst
@@ -185,8 +185,8 @@ The module defines the following:
-----------------------------
Solaris and derivatives have ``/dev/poll``. While :c:func:`!select` is
-O(highest file descriptor) and :c:func:`!poll` is O(number of file
-descriptors), ``/dev/poll`` is O(active file descriptors).
+*O*\ (*highest file descriptor*) and :c:func:`!poll` is *O*\ (*number of file
+descriptors*), ``/dev/poll`` is *O*\ (*active file descriptors*).
``/dev/poll`` behaviour is very close to the standard :c:func:`!poll`
object.
@@ -381,8 +381,8 @@ scalability for network servers that service many, many
clients at the same
time. :c:func:`!poll` scales better because the system call only requires
listing
the file descriptors of interest, while :c:func:`!select` builds a bitmap,
turns
on bits for the fds of interest, and then afterward the whole bitmap has to be
-linearly scanned again. :c:func:`!select` is O(highest file descriptor), while
-:c:func:`!poll` is O(number of file descriptors).
+linearly scanned again. :c:func:`!select` is *O*\ (*highest file descriptor*),
while
+:c:func:`!poll` is *O*\ (*number of file descriptors*).
.. method:: poll.register(fd[, eventmask])
diff --git a/Doc/reference/datamodel.rst b/Doc/reference/datamodel.rst
index e04827e34f7927..54ba171ec7696c 100644
--- a/Doc/reference/datamodel.rst
+++ b/Doc/reference/datamodel.rst
@@ -1854,7 +1854,7 @@ Basic customization
This is intended to provide protection against a denial-of-service caused
by carefully chosen inputs that exploit the worst case performance of a
- dict insertion, O(n\ :sup:`2`) complexity. See
+ dict insertion, *O*\ (*n*\ :sup:`2`) complexity. See
http://ocert.org/advisories/ocert-2011-003.html for details.
Changing hash values affects the iteration order of sets.
diff --git a/Doc/using/cmdline.rst b/Doc/using/cmdline.rst
index 5389d33023096d..0ddf2964ab11f4 100644
--- a/Doc/using/cmdline.rst
+++ b/Doc/using/cmdline.rst
@@ -366,7 +366,7 @@ Miscellaneous options
Hash randomization is intended to provide protection against a
denial-of-service caused by carefully chosen inputs that exploit the worst
- case performance of a dict construction, O(n\ :sup:`2`) complexity. See
+ case performance of a dict construction, *O*\ (*n*\ :sup:`2`) complexity.
See
http://ocert.org/advisories/ocert-2011-003.html for details.
:envvar:`PYTHONHASHSEED` allows you to set a fixed value for the hash
diff --git a/Doc/whatsnew/2.3.rst b/Doc/whatsnew/2.3.rst
index 01c8879ba83870..6127a5df966a18 100644
--- a/Doc/whatsnew/2.3.rst
+++ b/Doc/whatsnew/2.3.rst
@@ -1196,7 +1196,7 @@ Optimizations
* Multiplication of large long integers is now much faster thanks to an
implementation of Karatsuba multiplication, an algorithm that scales better
than
- the O(n\*n) required for the grade-school multiplication algorithm.
(Original
+ the *O*\ (*n*\ :sup:`2`) required for the grade-school multiplication
algorithm. (Original
patch by Christopher A. Craig, and significantly reworked by Tim Peters.)
* The ``SET_LINENO`` opcode is now gone. This may provide a small speed
@@ -1308,7 +1308,7 @@ complete list of changes, or look through the CVS logs
for all the details.
partially sorted order such that, for every index *k*, ``heap[k] <=
heap[2*k+1]`` and ``heap[k] <= heap[2*k+2]``. This makes it quick to remove
the
smallest item, and inserting a new item while maintaining the heap property
is
- O(lg n). (See https://xlinux.nist.gov/dads//HTML/priorityque.html for more
+ *O*\ (log *n*). (See https://xlinux.nist.gov/dads//HTML/priorityque.html
for more
information about the priority queue data structure.)
The :mod:`heapq` module provides :func:`~heapq.heappush` and
:func:`~heapq.heappop` functions
diff --git a/Doc/whatsnew/2.7.rst b/Doc/whatsnew/2.7.rst
index 099090487ed94a..25206c143c340b 100644
--- a/Doc/whatsnew/2.7.rst
+++ b/Doc/whatsnew/2.7.rst
@@ -282,7 +282,7 @@ How does the :class:`~collections.OrderedDict` work? It
maintains a
doubly linked list of keys, appending new keys to the list as they're inserted.
A secondary dictionary maps keys to their corresponding list node, so
deletion doesn't have to traverse the entire linked list and therefore
-remains O(1).
+remains *O*\ (1).
The standard library now supports use of ordered dictionaries in several
modules.
diff --git a/Doc/whatsnew/3.3.rst b/Doc/whatsnew/3.3.rst
index 3bc3d2f7c3740e..608a8b54c10ffd 100644
--- a/Doc/whatsnew/3.3.rst
+++ b/Doc/whatsnew/3.3.rst
@@ -174,7 +174,7 @@ Features
b or c are now hashable. (Contributed by Antoine Pitrou in :issue:`13411`.)
* Arbitrary slicing of any 1-D arrays type is supported. For example, it
- is now possible to reverse a memoryview in O(1) by using a negative step.
+ is now possible to reverse a memoryview in *O*\ (1) by using a negative step.
API changes
-----------
diff --git a/Misc/NEWS.d/3.5.0a1.rst b/Misc/NEWS.d/3.5.0a1.rst
index 96e59206cb1291..f793323f217070 100644
--- a/Misc/NEWS.d/3.5.0a1.rst
+++ b/Misc/NEWS.d/3.5.0a1.rst
@@ -2648,7 +2648,7 @@ module.
.. nonce: THJSYB
.. section: Library
-Changed FeedParser feed() to avoid O(N\ :sup:`2`) behavior when parsing long
line.
+Changed FeedParser feed() to avoid *O*\ (*n*\ :sup:`2`) behavior when parsing
long line.
Original patch by Raymond Hettinger.
..
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