DataFrames and Series

pandas has two core objects:

• A DataFrame is a table: rows and named columns.
• A Series is a single column, a list of values with a label.

Here is a DataFrame built from a dictionary. Each key becomes a column name, and each list holds that column's values.

Run it. You get a tidy table, with an automatic row number index down the left.

In real projects you usually load data from a file instead of typing it:

# Reading a CSV file (shown for reference; needs the file to be present)
data = pd.read_csv("students.csv")

read_csv is how most data science begins. The result is a DataFrame, exactly like the one you built above.

Exercise