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1TheFirstFewSteps
1.1 WhatIsaProgram?AndWhatIsProgramming?
Today,most people are experiencedwith computer programs, typically programs
suchasWord,Excel,PowerPoint, InternetExplorer,andPhotoshop.Theinteraction
with suchprograms isusuallyquite simpleand intuitive: youclickonbuttons, pull
downmenusandselectoperations,dragvisualelements intolocations,andsoforth.
Thepossibleoperationsyoucandointheseprogramscanbecombinedinseemingly
an infinitenumberofways,only limitedbyyourcreativityand imagination.
Nevertheless, programsoftenmakeus frustratedwhen they cannot dowhatwe
wish. One typical situationmight be the following. Say youhave somemeasure-
ments froma device, and the data are stored in a filewith a specific format. You
1©TheAuthor(s)2016
S.Linge,H.P.Langtangen,Programming for Computations –Python,
Texts inComputational Science andEngineering15,DOI10.1007/978-3-319-32428-9_1