Category: Developer Workflow
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Rename DataFrame column labels in pandas
Rename DataFrame column labels in pandas: use rename(columns=…) for selected fields, or replace df.columns with a full list. Learn how to change a DataFrame column name and avoid length mismatches.
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Git submodule init: Add, Initialize, and Update
Git submodules use a parent-repository pointer to a specific child commit. Learn git submodule init, add, update, and clone –recurse-submodules without losing recorded changes.
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df.plot: Plot a pandas DataFrame in Python
Use df.plot to turn a small pandas DataFrame into a chart: choose index or x and y columns, switch line, bar, or scatter kinds, then style the returned axes.
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How to set Git remote origin in a local repository
Set Git remote origin in a local repository with git remote add origin, confirm fetch and push URLs, make the first tracked push, and use set-url when origin already exists.
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Maps in C++: A Practical std::map and Iterator Guide
Learn maps in C++ with one compilable std::map example: declare key-value types, insert and update entries, look up and erase keys, and traverse safely with iterators.