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8.6: List Methods

  • Page ID
    8623
  • \( \newcommand{\vecs}[1]{\overset { \scriptstyle \rightharpoonup} {\mathbf{#1}} } \) \( \newcommand{\vecd}[1]{\overset{-\!-\!\rightharpoonup}{\vphantom{a}\smash {#1}}} \)\(\newcommand{\id}{\mathrm{id}}\) \( \newcommand{\Span}{\mathrm{span}}\) \( \newcommand{\kernel}{\mathrm{null}\,}\) \( \newcommand{\range}{\mathrm{range}\,}\) \( \newcommand{\RealPart}{\mathrm{Re}}\) \( \newcommand{\ImaginaryPart}{\mathrm{Im}}\) \( \newcommand{\Argument}{\mathrm{Arg}}\) \( \newcommand{\norm}[1]{\| #1 \|}\) \( \newcommand{\inner}[2]{\langle #1, #2 \rangle}\) \( \newcommand{\Span}{\mathrm{span}}\) \(\newcommand{\id}{\mathrm{id}}\) \( \newcommand{\Span}{\mathrm{span}}\) \( \newcommand{\kernel}{\mathrm{null}\,}\) \( \newcommand{\range}{\mathrm{range}\,}\) \( \newcommand{\RealPart}{\mathrm{Re}}\) \( \newcommand{\ImaginaryPart}{\mathrm{Im}}\) \( \newcommand{\Argument}{\mathrm{Arg}}\) \( \newcommand{\norm}[1]{\| #1 \|}\) \( \newcommand{\inner}[2]{\langle #1, #2 \rangle}\) \( \newcommand{\Span}{\mathrm{span}}\)\(\newcommand{\AA}{\unicode[.8,0]{x212B}}\)

    Python provides methods that operate on lists. For example, append adds a new element to the end of a list:

    >>> t = ['a', 'b', 'c']
    >>> t.append('d')
    >>> print(t)
    ['a', 'b', 'c', 'd']

    extend takes a list as an argument and appends all of the elements:

    >>> t1 = ['a', 'b', 'c']
    >>> t2 = ['d', 'e']
    >>> t1.extend(t2)
    >>> print(t1)
    ['a', 'b', 'c', 'd', 'e']

    This example leaves t2 unmodified.

    sort arranges the elements of the list from low to high:

    >>> t = ['d', 'c', 'e', 'b', 'a']
    >>> t.sort()
    >>> print(t)
    ['a', 'b', 'c', 'd', 'e']

    Most list methods are void; they modify the list and return None. If you accidentally write t = t.sort(), you will be disappointed with the result.


    This page titled 8.6: List Methods is shared under a CC BY-NC-SA license and was authored, remixed, and/or curated by Chuck Severance.

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