Python jupyter notebook expert needed for simple subtraction on multiple rows on a csv file -very simple task if you are an Expert

I just want a separate column name Total_difference. I have added my code but some reason i can not do the subtract between first 'Start' and first 'Stop' and put it in Total_different column.

you will see column 'Symbol' has a hawthorne which start in multiple rows consecutively and the stop consecutively. I want to subtract time difference first 'start' with first 'stop' of Hawthorne and same on like second, third (start, stop).

Use only my code to modify

data_1 is the csv file

and Practice_data_third is my code

Skills: Python, Machine Learning (ML)

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( 11 reviews ) San Diego, United States

Project ID: #25851103

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★★★ Python Jupyter NoteBook Code ★★★ Thank you for your attention. I understood fully about your task. It is my greatest pleasure to learn new technologies by consulting with customers and sharing their opinions and More

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Hello Sir/ Ma’am As a highly skilled full stack developer, I have rich experience in JAVA, C, C++, C# Python , Arduino, [login to view URL], Word press, and ANDROID. I am very confident with my skills and I'd like to he More

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Hi, We can create an index, join and subtract the stop-start. I may have follow up questions on this. I am a Data Scientist with 9+ years of experience with expertise in Machine learning and automation using tools li More

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