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In computing, copy-and-patch compilation is a simple compiler technique intended for just-in-time compilation (JIT compilation) that uses pattern matching to match pre-generated templates to parts of an abstract syntax tree (AST) or bytecode stream, and emit corresponding pre-written machine code fragments that are then patched to insert memory addresses, register addresses, constants and ...
JIT causes a slight to noticeable delay in the initial execution of an application, due to the time taken to load and compile the input code. Sometimes this delay is called "startup time delay" or "warm-up time". In general, the more optimization JIT performs, the better the code it will generate, but the initial delay will also increase.
Python's is operator may be used to compare object identities (comparison by reference), and comparisons may be chained—for example, a <= b <= c. Python uses and, or, and not as Boolean operators. Python has a type of expression named a list comprehension, and a more general expression named a generator expression. [78]
Python 2.6 was released to coincide with Python 3.0, and included some features from that release, as well as a "warnings" mode that highlighted the use of features that were removed in Python 3.0. [ 28 ] [ 10 ] Similarly, Python 2.7 coincided with and included features from Python 3.1, [ 29 ] which was released on June 26, 2009.
The REPL gives user access to the system shell and to help mode, by pressing ; or ? after the prompt (preceding each command), respectively. It also keeps the history of commands, including between sessions. [98] Code can be tested inside Julia's interactive session or saved into a file with a .jl extension and run from the command line by ...
The next day, talks began for evacuating people from the 10-kilometre (6.2 mi) zone. [62] Ten days after the accident, the evacuation area was expanded to 30 kilometres (19 mi). [64]: 115, 120–121 The Chernobyl Nuclear Power Plant Exclusion Zone has remained ever since, although its shape has changed and its size has been expanded.
The AIM-9 Sidewinder ("AIM" for "Air Interception Missile") [3] is a short-range air-to-air missile.Entering service with the United States Navy in 1956 and the Air Force in 1964, the AIM-9 is one of the oldest, cheapest, and most successful air-to-air missiles. [4]
[29] [63] He is the only player to score a century on debut in all three of his domestic first-class tournaments (the Ranji, Irani, and Duleep Trophies). [64] Another double century was an innings of 233* against Tamil Nadu in the semi-finals of the 2000 Ranji Trophy , which he regards as one of the best innings of his career.