Questions on "import" and "datetime"

Newsgroups	comp.lang.python
Date	2013-06-10 08:37 -0700
Message-ID	<c854d114-bcfa-4491-8a4a-a377998bdf0e@googlegroups.com> (permalink)
Subject	Questions on "import" and "datetime"
From	Yunfei Dai <yunfei.dai.sigma@gmail.com>

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Hi all,

I have some questions on "import":

1."from datetime import datetime" works well. But I am confused why "import datetime.datetime" leads to importerror. "from xlrd import open_workbook" could be replaced by "from xlrd.open_workbook" without any problem. The only difference here is that if "from xlrd import open_workbook" is used we do not have to write "xlrd.open_workbook" in the following code but just "open_workbook". So my understanding of the difference is "from...import..." shortens the code (just like "using namespace std" in C++) but maybe leads to name clash. But what is the problem of datetime? 

2.I am also comfused that "datetime.datetime" is a function but whithin "datetime.datetime" there are lots of other functions. So what is the type of "datetime.datetime" on earth? is it a function, or a class or a folder(library) here?

Thanks very much in advance! Very looking forward to your answers.

Best,
Yunfei

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Questions on "import" and "datetime" Yunfei Dai <yunfei.dai.sigma@gmail.com> - 2013-06-10 08:37 -0700
  Re: Questions on "import" and "datetime" Zachary Ware <zachary.ware+pylist@gmail.com> - 2013-06-10 12:01 -0500
    Re: Questions on "import" and "datetime" Yunfei Dai <yunfei.dai.sigma@gmail.com> - 2013-06-12 03:29 -0700
  Re: Questions on "import" and "datetime" Dave Angel <davea@davea.name> - 2013-06-10 15:10 -0400
    Re: Questions on "import" and "datetime" Yunfei Dai <yunfei.dai.sigma@gmail.com> - 2013-06-12 03:41 -0700

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