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10.4: List operations

  • Page ID
    40783
  • \( \newcommand{\vecs}[1]{\overset { \scriptstyle \rightharpoonup} {\mathbf{#1}} } \) \( \newcommand{\vecd}[1]{\overset{-\!-\!\rightharpoonup}{\vphantom{a}\smash {#1}}} \)\(\newcommand{\id}{\mathrm{id}}\) \( \newcommand{\Span}{\mathrm{span}}\) \( \newcommand{\kernel}{\mathrm{null}\,}\) \( \newcommand{\range}{\mathrm{range}\,}\) \( \newcommand{\RealPart}{\mathrm{Re}}\) \( \newcommand{\ImaginaryPart}{\mathrm{Im}}\) \( \newcommand{\Argument}{\mathrm{Arg}}\) \( \newcommand{\norm}[1]{\| #1 \|}\) \( \newcommand{\inner}[2]{\langle #1, #2 \rangle}\) \( \newcommand{\Span}{\mathrm{span}}\) \(\newcommand{\id}{\mathrm{id}}\) \( \newcommand{\Span}{\mathrm{span}}\) \( \newcommand{\kernel}{\mathrm{null}\,}\) \( \newcommand{\range}{\mathrm{range}\,}\) \( \newcommand{\RealPart}{\mathrm{Re}}\) \( \newcommand{\ImaginaryPart}{\mathrm{Im}}\) \( \newcommand{\Argument}{\mathrm{Arg}}\) \( \newcommand{\norm}[1]{\| #1 \|}\) \( \newcommand{\inner}[2]{\langle #1, #2 \rangle}\) \( \newcommand{\Span}{\mathrm{span}}\)

    The + operator concatenates lists:

    >>> a = [1, 2, 3]
    >>> b = [4, 5, 6]
    >>> c = a + b
    >>> c
    [1, 2, 3, 4, 5, 6]
    

    The * operator repeats a list a given number of times:

    >>> [0] * 4
    [0, 0, 0, 0]
    >>> [1, 2, 3] * 3
    [1, 2, 3, 1, 2, 3, 1, 2, 3]
    

    The first example repeats [0] four times. The second example repeats the list [1, 2, 3] three times.


    10.4: List operations is shared under a CC BY-NC 3.0 license and was authored, remixed, and/or curated by Allen B. Downey.

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