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Da Pandas Melt Stack — Free Data Analytics Tutorial

Learn Da Pandas Melt Stack in Data Analytics with a free, beginner-friendly tutorial, examples and practice for Indian students on Syllab.in.

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TL;DR: Learn Da Pandas Melt Stack in Data Analytics with a free, beginner-friendly tutorial, examples and practice for Indian students on Syllab.in.

Written & reviewed by the Syllab.in Academic Team (CBSE/NCERT subject experts) · Updated Jul 14, 2026

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Da Pandas Melt Stack in Data Analytics

Data comes in two shapes: Wide (many columns, few rows) and Long (few columns, many rows). Both are valid; choose based on your analysis.

Wide format: Subjects as columns (Maths, Science, English columns). Long format: One column for Subject, one for Score.

melt() converts wide → long. stack() also converts wide → long but is index-based. unstack() does the opposite (long → wide).

When to use: Long format is better for groupBy and analysis. Wide format is better for comparison and pivot tables.

Da Pandas Melt Stack — Syntax

# Melt: wide → long
# df_long = df.melt(id_vars=['student'],
#                     value_vars=['Maths', 'Science'],
#                     var_name='subject',
#                     value_name='marks')

# Unstack: long → wide (for time series or MultiIndex)
# df_wide = df_long.pivot(index='student',
#

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