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Course

Writing Efficient Python Code

СреднийУровень мастерства

Обновлено 01.2026

Learn to write efficient code that executes quickly and allocates resources skillfully to avoid unnecessary overhead.

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PythonProgramming4 ч15 videos52 Exercises4,000 XP150K+Свидетельство о достижениях

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Описание курса

As a Data Scientist, the majority of your time should be spent gleaning actionable insights from data -- not waiting for your code to finish running. Writing efficient Python code can help reduce runtime and save computational resources, ultimately freeing you up to do the things you love as a Data Scientist. In this course, you'll learn how to use Python's built-in data structures, functions, and modules to write cleaner, faster, and more efficient code. We'll explore how to time and profile code in order to find bottlenecks. Then, you'll practice eliminating these bottlenecks, and other bad design patterns, using Python's Standard Library, NumPy, and pandas. After completing this course, you'll have the necessary tools to start writing efficient Python code!The videos contain live transcripts you can reveal by clicking "Show transcript" at the bottom left of the videos. The course glossary can be found on the right in the resources section. To obtain CPE credits you need to complete the course and reach a score of 70% on the qualified assessment. You can navigate to the assessment by clicking on the CPE credits callout on the right.

Предварительные требования

Data Types in Python Python Toolbox

1

Foundations for efficiencies

In this chapter, you'll learn what it means to write efficient Python code. You'll explore Python's Standard Library, learn about NumPy arrays, and practice using some of Python's built-in tools. This chapter builds a foundation for the concepts covered ahead.

Pop quiz: what is efficient

A taste of things to come

Zen of Python

Building with built-ins

Built-in practice: range()

Built-in practice: enumerate()

Built-in practice: map()

The power of NumPy arrays

Practice with NumPy arrays

Bringing it all together: Festivus!

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2

Timing and profiling code

In this chapter, you will learn how to gather and compare runtimes between different coding approaches. You'll practice using the line_profiler and memory_profiler packages to profile your code base and spot bottlenecks. Then, you'll put your learnings to practice by replacing these bottlenecks with efficient Python code.

Examining runtime

Using %timeit: your turn!

Using %timeit: specifying number of runs and loops

Using %timeit: formal name or literal syntax

Code profiling for runtime

Pop quiz: steps for using %lprun

Using %lprun: spot bottlenecks

Using %lprun: fix the bottleneck

Code profiling for memory usage

Pop quiz: steps for using %mprun

Using %mprun: Hero BMI

Using %mprun: Hero BMI 2.0

Bringing it all together: Star Wars profiling

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3

Gaining efficiencies

This chapter covers more complex efficiency tips and tricks. You'll learn a few useful built-in modules for writing efficient code and practice using set theory. You'll then learn about looping patterns in Python and how to make them more efficient.

Efficiently combining, counting, and iterating

Combining Pokémon names and types

Counting Pokémon from a sample

Combinations of Pokémon

Comparing Pokédexes

Searching for Pokémon

Gathering unique Pokémon

Eliminating loops

Gathering Pokémon without a loop

Pokémon totals and averages without a loop

Writing better loops

One-time calculation loop

Holistic conversion loop

Bringing it all together: Pokémon z-scores

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4

Basic pandas optimizations

This chapter offers a brief introduction on how to efficiently work with pandas DataFrames. You'll learn the various options you have for iterating over a DataFrame. Then, you'll learn how to efficiently apply functions to data stored in a DataFrame.

Intro to pandas DataFrame iteration

Iterating with .iterrows()

Run differentials with .iterrows()

Another iterator method: .itertuples()

Iterating with .itertuples()

Run differentials with .itertuples()

pandas alternative to looping

Analyzing baseball stats with .apply()

Settle a debate with .apply()

Optimal pandas iterating

Replacing .iloc with underlying arrays

Bringing it all together: Predict win percentage

Congratulations!

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Writing Efficient Python Code

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