Python Pandas - What is the most effective way to count your dataframe rows

When you work with Pandas in Python there will be multi ways to count your dataframe one, i have testet 4 ways to count, and depens on what i want there will be 2 ways there are better then the 2 orthers.

whats my video and learn witch way you shut count your dataframe one.

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Sample csv file can you download here:

[robertmaddox]

Thank you for your presentation the only criticism that I could offer is that you make the screen larger so that we can see what you are doing clearer.