looking up function's doc in emacs

[Xah Lee]

in programing elisp in emacs, i can press “Ctrl+h f” to lookup the doc
for the function under cursor.

is there such facility when coding in perl, python, php?

(i'm interested in particular python. In perl, i can work around with
“perldoc -f functionName”, and in php it's php.net/functionName. Both
of which i have a elisp command with a shortcut that let me jump to
the doc)

Thanks.

  Xah
∑ http://xahlee.org/

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