Python 2.7: no documentation found when typing help('print')

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本文解决在安装了Python2.7的Ubuntu12.04上，使用help()函数获取文档时遇到的问题。通过帮助文档发现，在Python2.7中打印相关函数作为特殊关键字处理，因此直接调用help('print')会失败。解决方案是在调用help()时指定使用内置打印函数，即help('__builtin__.print')。

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原文转自http://askubuntu.com/questions/230994/python-2-7-no-documentation-found-when-typing-helpprint

I have just installed Python 2.7 and Python 3.2 on my Ubuntu 12.04 (32 bit).

sudo apt-get install python python-doc python3 python3-doc

I opened a Python 3 shell (is it called like that) typing python3 from a terminal.If I issue the commandhelp('print') everything works fine and I can read the documentation.

However if I open a Python 2.7 shell (python from a terminal) when I typehelp('print') I get the following message:

no documentation found for 'print'

How can I get to use the documentation in Python 2.7 as well?

This looks like a bug of Python 2 as something like help("dir") works properly. It probably does not work becauseprint is a special keyword, unlike Python 3. Stick to Python 3 or run the following command instead ofhelp("print"):