Creating DataFrames

A DataFrame is a table with named columns. Each column is a Series.

• Build one from a dictionary: column name → list of values.
• pd.read_csv('file.csv') loads a table from a file.
• Every column has one type, like int64 or object (text).

import pandas as pd
df = pd.DataFrame({"name": ["Asha", "Ravi"], "marks": [82, 67]})
print(df.shape, list(df.columns))

(2, 2) ['name', 'marks']

Remember: Think of a DataFrame as a spreadsheet you control with code.

Common mistake: Giving columns lists of different lengths. Every column needs the same number of rows.