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  2. Associative array - Wikipedia

    en.wikipedia.org/wiki/Associative_array

    find the value (if any) that is bound to a given key. The argument to this operation is the key, and the value is returned from the operation. If no value is found, some lookup functions raise an exception, while others return a default value (such as zero, null, or a specific value passed to the constructor).

  3. Comma-separated values - Wikipedia

    en.wikipedia.org/wiki/Comma-separated_values

    Comma-separated values is a data format that predates personal computers by more than a decade: the IBM Fortran (level H extended) compiler under OS/360 supported CSV in 1972. [14] List-directed ("free form") input/output was defined in FORTRAN 77, approved in 1978. List-directed input used commas or spaces for delimiters, so unquoted character ...

  4. List of mathematical constants - Wikipedia

    en.wikipedia.org/wiki/List_of_mathematical_constants

    For example, the constant π may be defined as the ratio of the length of a circle's circumference to its diameter. The following list includes a decimal expansion and set containing each number, ordered by year of discovery. The column headings may be clicked to sort the table alphabetically, by decimal value, or by set.

  5. Data orientation - Wikipedia

    en.wikipedia.org/wiki/Data_orientation

    For example, a table of 128 rows with a Boolean column requires 128 bytes a row-oriented format (one byte per Boolean) but 128 bits (16 bytes) in a column-oriented format (via a bitmap). Another example is the use of run-length encoding to encode a column.

  6. Constant (computer programming) - Wikipedia

    en.wikipedia.org/wiki/Constant_(computer...

    In computer programming, a constant is a value that is not altered by the program during normal execution. When associated with an identifier , a constant is said to be "named," although the terms "constant" and "named constant" are often used interchangeably.

  7. Dynamic array - Wikipedia

    en.wikipedia.org/wiki/Dynamic_array

    The dynamic array has performance similar to an array, with the addition of new operations to add and remove elements: Getting or setting the value at a particular index (constant time) Iterating over the elements in order (linear time, good cache performance) Inserting or deleting an element in the middle of the array (linear time)

  8. Cowboys QB Dak Prescott likely done for season with hamstring ...

    www.aol.com/sports/cowboys-qb-dak-prescott...

    The decision to undergo surgery is not yet final: Prescott is flying to New York to get the opinion of one more specialist, per ESPN's Adam Schefter.Most likely, though, Prescott's season is over ...

  9. Coefficient - Wikipedia

    en.wikipedia.org/wiki/Coefficient

    A constant coefficient, also known as constant term or simply constant, is a quantity either implicitly attached to the zeroth power of a variable or not attached to other variables in an expression; for example, the constant coefficients of the expressions above are the number 3 and the parameter c, involved in 3=c ⋅ x 0.

  1. Related searches pandas dataframe add column with constant value in dictionary list

    pandas dataframe add column with constant value in dictionary list python