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  2. pandas (software) - Wikipedia

    en.wikipedia.org/wiki/Pandas_(software)

    [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.

  3. Foreach loop - Wikipedia

    en.wikipedia.org/wiki/Foreach_loop

    foreach loops are almost always used to iterate over items in a sequence of ... in is the only kind of for loop in Python, the equivalent to the "counter ...

  4. For loop - Wikipedia

    en.wikipedia.org/wiki/For_loop

    Python does not contain the classical for loop, rather a foreach loop is used to iterate over the output of the built-in range() function which returns an iterable sequence of integers. for i in range ( 1 , 6 ): # gives i values from 1 to 5 inclusive (but not 6) # statements print ( i ) # if we want 6 we must do the following for i in range ( 1 ...

  5. Iterator pattern - Wikipedia

    en.wikipedia.org/wiki/Iterator_pattern

    In object-oriented programming, the iterator pattern is a design pattern in which an iterator is used to traverse a container and access the container's elements. The iterator pattern decouples algorithms from containers; in some cases, algorithms are necessarily container-specific and thus cannot be decoupled.

  6. Iterator - Wikipedia

    en.wikipedia.org/wiki/Iterator

    Some object-oriented languages such as C#, C++ (later versions), Delphi (later versions), Go, Java (later versions), Lua, Perl, Python, Ruby provide an intrinsic way of iterating through the elements of a collection without an explicit iterator. An iterator object may exist, but is not represented in the source code.

  7. Connected-component labeling - Wikipedia

    en.wikipedia.org/wiki/Connected-component_labeling

    Iterate through each element of the data by column, then by row; If the element is not the background Relabel the element with the lowest equivalent label; Here, the background is a classification, specific to the data, used to distinguish salient elements from the foreground. If the background variable is omitted, then the two-pass algorithm ...

  8. Iteration - Wikipedia

    en.wikipedia.org/wiki/Iteration

    In mathematics, iteration may refer to the process of iterating a function, i.e. applying a function repeatedly, using the output from one iteration as the input to the next. Iteration of apparently simple functions can produce complex behaviors and difficult problems – for examples, see the Collatz conjecture and juggler sequences .

  9. Cursor (databases) - Wikipedia

    en.wikipedia.org/wiki/Cursor_(databases)

    In computer science, a database cursor is a mechanism that enables traversal over the records in a database. Cursors facilitate processing in conjunction with the traversal, such as retrieval, addition and removal of database records.