General Function for Fetch PV Readings

fetch_data is a general function/tool for fetching PV readings during a given period of time, and return the averaged readings, with other options.

Two approaches are developed to support such operation:

By using the Python function called fetch_data, i.e. from phantasy import fetch_data

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By using the CLI tool called fetch_data, just type in the Terminal.

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And an example with the real EPICS network:

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