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Lesson 1-1 - Structuring and wrangling messy data using a spreadsheet editor.ipynb

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"Consider renaming your two datasheets, e.g. in \"Raw data\" and \"Data\" or in \"Data – original\" and \"Data – edited\". If you have a massive Excel file with lots of sheets, you can also create a backup file of the original document and store that in a \"source\" folder.\n",
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"Why should you do this? Because you will heavily edit the data. I've learned the hard way that I'll always change the data more than participated. \"I don't need to copy the data this time.\" I think. \"I only want to clean it up a bit; I won't delete anything important.\" Two hours pass…and I need to download the data again from its original source because oh, yeah, I did delete this now-important column an hour ago. Learn from my mistakes, save yourself a lot of time and never edit the original data.\n",
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"Why should you do this? Because you will heavily edit the data. I've learned the hard way that I'll always change the data more than anticipated. \"I don't need to copy the data this time.\" I think. \"I only want to clean it up a bit; I won't delete anything important.\" Two hours pass…and I need to download the data again from its original source because oh, yeah, I did delete this now-important column an hour ago. Learn from my mistakes, save yourself a lot of time and never edit the original data.\n",
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"### 1.4.4 Save your source in an extra sheet\n",
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