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Leo Marsh1d ago • 2 min read
The first thing I check before trusting any dataset
Every dataset I've ever received came with a description. Almost none of them matched the data. Not...
#datascience#python#pandas#beginners
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Michael Nocito4d ago • 13 min read
How to Set Up Jupyter Notebook (And Why Your Environment Is Missing From the Kernel List)
Install Jupyter, run your first notebook, and understand the three parts that make it work: browser,...
#python#pandas#dataanalysis#tutorial
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Michael Nocito3d ago • 13 min read
How to Install Python for Data Analysis (And Why pip install Then Fails)
Install Python for data analysis without ending up with three of them. Anaconda or python.org answer...
#python#pandas#dataanalysis#tutorial
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Michael Nocito3d ago • 14 min read
Handling Missing Values in pandas: dropna, fillna and What Each One Claims
Seven missing cells cost four rows to dropna and half a column to axis=1. Filling with zero moved th...
#python#pandas#dataanalysis#tutorial
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Michael Nocito3d ago • 13 min read
pandas drop_duplicates: keep='first', and the Row It Chose For You
duplicated and drop_duplicates on the same eight rows: 7, 5 or 2 rows out depending on the arguments...
#python#pandas#dataanalysis#tutorial
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Michael Nocito2d ago • 13 min read
pandas merge: Left Join, Inner Join, and the One That Doubled the Revenue
The four hows and the row counts they give, indicator to see which side each row came from, and one ...
#python#pandas#dataanalysis#tutorial
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Michael Nocito2d ago • 14 min read
pandas read_csv: Your First DataFrame, and What It Guessed
Four commands to look at a new file, then the arguments that stop read_csv guessing: dtype, parse_da...
#python#pandas#dataanalysis#tutorial
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Michael Nocito2d ago • 13 min read
pandas pct_change and cumsum: Percent Change and Running Totals
groupby gave four months and a tidy -6.0%. resample gave five, an empty April at -100%, and an infin...
#python#pandas#dataanalysis#tutorial
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Petrichor5d ago • 3 min read
Comparing weather across cities in Python: the timezone trap
Charting one city's forecast is a five-minute job. Charting four on the same axis raises a question....
#phyton#tutorial#api#pandas
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qing5d ago • 5 min read
Pandas vs Polars: Which One Should You Use in 2025?
Pandas vs Polars: Which One Should You Use in 2025? tags: python, data, pandas,...
#python#data#pandas#tutorial
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