Project interpreter not specified (eclipse + pydev)

【note】
      Recently, because I want to configure the Android development environment, I deleted the original MyEclipse5.5 and downloaded the latest Eclipse3.7 version. Because I was developing Python before, I downloaded the latest Pydev2.4 version. During the project, the following error is prompted: Project interpreter not specified.

      At first I thought that there was a problem with the plugin installation, but after a long time of investigation, I found that it was caused by the development environment that did not import Python.

      Know the reason and solve it is very simple:

      Of course, your system must have installed the Python installation environment, which is a must, because Eclipse only provides an IDE, and does not provide interpreters, compilers, etc. in various languages.

      Then follow the simple steps below.

      1. Open the preferences configuration from the Eclipse menu Window-> Preferences;
      2. Preferences configuration page, find the PyDev item on the left to expand, click the Interpreter-Python item (Interpreter is the meaning of the interpreter).
      3. Then click the New ... button on the right. If Interpreter Name is not filled in, it is a problem if it is empty. Select the installation location of python.exe, and then wait for the import to be completed. The problem is solved;

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