Practice

Data analysis lab

A notebook for NumPy, Pandas, and Matplotlib. Each page is a short document: read a note, run a cell, and see the text or chart under that cell. Later cells keep the names you created.

NumPy course

Arrays, masks, and broadcasting

Pandas course

Tables, cleaning, and groupby

Matplotlib course

Figures, charts, and subplots

Open datasets

CC0

Palmer penguins

344 penguins from Palmer Station, with bill and flipper measurements and a few missing values.

penguins.csv

Public domain

Iris

150 iris flowers, four measurements, and a species label. A small numeric table for arrays and histograms.

iris.csv

Public domain

Anscombe's quartet

Four tiny datasets with nearly the same summary statistics and very different shapes.

anscombe.csv

NumPy problem set

50 problems

Solve your way to fluency

Arrays, indexing, masks, broadcasting, reductions, shape, sorting, linear algebra, and the Iris measurements. Each problem has a starter and a folded solution.

Practice notebooks

Scale an array without a loop

Build an array, double it, and keep the values that pass a test. The second cell uses the name from the first.

Add a bonus to every row

Broadcast a length-3 bonus across a 2 by 3 grade table.

Inspect the penguins table

Load penguins.csv, then count species from the DataFrame the first cell created.

Filter Gentoo penguins

Keep one species and one new column, using the table from the cell above.

Draw a line on a named axes

Create a figure and an axes, then plot five temperatures.

matplotlibpenguins

Scatter penguin bills

Drop missing measurements, then plot bill length against bill depth.

Exercises

Mean sepal length, no loop

Turn the Iris sepal column into an array and compute its mean with NumPy.

Petals longer than 1.5 cm

Use a boolean mask on the Iris petal-length column.

How many Adelie penguins?

Filter Palmer penguins to one species and count the rows.

Mean body mass by species

Group the penguins table and average body mass.

Histogram of sepal length

Bin the Iris sepal lengths and label the axes.

matplotlibanscombe

Four panels for Anscombe

Plot each Anscombe dataset in its own panel, with shared axes.