The EvalMember command executes a class member operation, s.n, using the Python interpreter.

By default the value returned is converted into a Maple data structure.  If no conversion is available, the return value will be an expression of type python, a Python object reference that can be used in subsequent calls to Python.

The syntax, s:-n is usually preferred, but, in rare circumstances where evaluation of s is non-standard such that s may not be defined prior to forming the s:-n expression, the EvalMember(s,n) command can be used to resolve s.

This function is part of the Python package, so it can be used in the short form EvalMember(..) only after executing the command with(Python). However, it can always be accessed through the long form of the command by using Python[EvalMember](..).

$\mathrm{with}\left(\mathrm{Python}\right)\:$

$\mathrm{ImportModule}\left(''from\; bs4\; import\; BeautifulSoup''\right)$

$\mathrm{soup}≔\mathrm{EvalFunction}\left(\mathrm{BeautifulSoup}\,\mathrm{htmldoc}\,''html.parser''\right)$

$\mathrm{soup}:-\mathrm{h1}:-\mathrm{string}$

$''Great\; Novels''$

$\mathrm{EvalMember}\left(\mathrm{EvalMember}\left(\mathrm{soup}\,\mathrm{h1}\right)\,\mathrm{string}\right)$

$''Great\; Novels''$

$\mathrm{eval}\left('\mathrm{link}:-\mathrm{text}'\,\left\{\mathrm{link}=\mathrm{soup}:-\mathrm{find}\left('a'\right)\right\}\right)$

$\mathrm{eval}\left('\mathrm{EvalMember}'\left(\mathrm{link}\,''text''\right)\,\left\{\mathrm{link}=\mathrm{soup}:-\mathrm{find}\left('a'\right)\right\}\right)$

$''Don\; Quixote''$

$\left[\mathrm{seq}\left(\mathrm{EvalMember}\left(\mathrm{link}\,''text''\right)\,\mathrm{link}\mathbf{in}\mathrm{soup}:-\mathrm{find\_all}\left('a'\right)\right)\right]$

$\left[''Don\; Quixote''\,''Crime\; and\; Punishment''\,''The\; Count\; of\; Monte\; Cristo''\right]$

The Python[EvalMember] command was introduced in Maple 2018.

For more information on Maple 2018 changes, see Updates in Maple 2018.