Category: Python
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Do you teach Python? Then check out course-setup
TL;DR: If you teach Python, then you should check out course-setup (https://pypi.org/project/course-setup/) at PyPI! I’ve been teaching Python and Pandas for many years. And while I started my teaching career like many other instructors, with slides, I quickly discovered that it was better for my students — and for me! — to replace them with…
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Pandas str.split: Get the first item of a comma-separated column
A Python Pandas column contains comma-separated values. How can you get the first of those? First, break each string into a list: Then use .str[0] to grab the first element from the resulting list:
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Pandas str.isdigit: Checking whether strings contain only digits
Want to check whether a Python Pandas string series only contains digits? Use str.isdigit: This returns a boolean series, with df’s index. You can then convert the digit-containing strings to integers:
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Pandas string slicing: Extracting substrings with .str.slice
Want to retrieve a slice from a string column in your Python Pandas data frame? Use .str.slice:
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Pandas .str.get: Retrieving characters from string columns
Want to retrieve from a string column in your Python Pandas data frame? Use .str.get: But wait: You can use [], in place of .get:
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Pandas MultiIndex: Dropping a level with reset_index(drop=True)
Your Python Pandas data frame has a multi-index, and you want to remove one part — not return it to be a regular column? Add drop=True:
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Pandas reset_index: Moving multi-index levels back to columns
Your Python Pandas data frame has a multi-index? Return selected parts to columns with the “level” keyword argument:
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Pandas reset_index: Turning a data frame’s index into a column
Return a Python Pandas data frame’s index to a regular column with reset_index: • 1-column index? It’s now a regular column.• Multi-index? Its columns are all regular columns. reset_index returns a new data frame. It doesn’t modify the original.
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Pandas set_index: Turning columns into a data frame index
Turn a column in a Python Pandas data frame into an index with set_index: Remember, set_index returns a new data frame. It doesn’t change the original one. Turn multiple columns into a multi-index by passing a list:
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Multi-line f-strings in Python: Triple quotes with interpolation
Want to include a dynamic value in a multi-line Python string? That would require both an f-string and a triple-quoted string. Good news: Python supports this!