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[4]: 114 A DataFrame is a 2-dimensional data structure of rows and columns, similar to a spreadsheet, and analogous to a Python dictionary mapping column names (keys) to Series (values), with each Series sharing an index. [4]: 115 DataFrames can be concatenated together or "merged" on columns or indices in a manner similar to joins in SQL.
Python sets are very much like mathematical sets, and support operations like set intersection and union. Python also features a frozenset class for immutable sets, see Collection types. Dictionaries (class dict) are mutable mappings tying keys and corresponding values. Python has special syntax to create dictionaries ({key: value})
For the decimal formats, the usual encoding of unsigned integers is used. If an operation has a single NaN input and propagates it to the output, the result NaN's payload should be that of the input NaN (this is not always possible for binary formats when the signaling/quiet state is encoded by an is_signaling flag, as explained above). If ...
There are three symbols for NAND gates: the MIL/ANSI symbol, the IEC symbol and the deprecated DIN symbol sometimes found on old schematics. The ANSI symbol for the NAND gate is a standard AND gate with an inversion bubble connected.
Sodium nitride is the inorganic compound with the chemical formula Na 3 N. In contrast to lithium nitride and some other nitrides, sodium nitride is an extremely unstable alkali metal nitride.
Despite the common name "sacred bamboo", it is not a bamboo but an erect evergreen shrub up to 2 m (7 ft) tall by 1.5 m (5 ft) wide, with numerous, usually unbranched stems growing from ground level. The glossy leaves are sometimes deciduous in colder areas, 50–100 cm (20–39 in) long, bi- or tri- pinnately compound, with the individual ...
The Nan Movie is a 2022 British comedy film written by Catherine Tate and Brett Goldstein and directed by Josie Rourke (uncredited). [1] The film stars Tate and Mathew Horne.It is based on the television series, Catherine Tate's Nan, which is a set of four specials that were broadcast between 2009 and 2015, and itself is a spin-off of the television sketch series, The Catherine Tate Show (2004 ...
Chen Nan (Chinese: 陈楠; pinyin: Chén Nán; born January 8, 1983) is a Chinese basketball player. Chen was part of the Chinese teams that won gold medals at the 2002, 2006, and 2010 Asian Games. She competed at the 2004 Summer Olympics in Athens, the 2008 Summer Olympics in Beijing, and the 2012 Summer Olympics in London. [1] [2]