How to Execute Multiple Lines in a Single Line Python From Command-Line?
Summary: To make a Python one-liner out of any multi-line Python script, replace the new lines with a new line character ‘\n’ and pass the result into the exec(. ) function. You can run this script from the outside (command line, shell, terminal) by using the command python -c «exec(. )» .
Just make sure to use the python -c prefix and then pack the single-line multi-liner into a string value that is passed as an argument to the python program.
This is how it looks in my Win 10 powershell:
PS C:\Users\xcent> python -c "exec('x = 10\nfor i in range(5):\n if x%2 ==0: print(i)\n else: print(x)\n x = x-1')" 0 9 2 7 4 Method 3: Use Ternary Operator to One-Linerize the Code
Of course, you can also create your own semantically-equivalent one-liner using a bit of creativity and Python One-Liner skills (e.g., acquired through reading my book “Python One-Liners” from NoStarch)!
# Method 3 for i in range(5): print(10-i) if i%2 else print(i)
You can easily convince yourself that the code does the same thing in a single line!
Python One-Liners Book: Master the Single Line First!
Python programmers will improve their computer science skills with these useful one-liners.
Python One-Liners will teach you how to read and write “one-liners”: concise statements of useful functionality packed into a single line of code. You’ll learn how to systematically unpack and understand any line of Python code, and write eloquent, powerfully compressed Python like an expert.
The book’s five chapters cover (1) tips and tricks, (2) regular expressions, (3) machine learning, (4) core data science topics, and (5) useful algorithms.
Detailed explanations of one-liners introduce key computer science concepts and boost your coding and analytical skills. You’ll learn about advanced Python features such as list comprehension, slicing, lambda functions, regular expressions, map and reduce functions, and slice assignments.
- Leverage data structures to solve real-world problems, like using Boolean indexing to find cities with above-average pollution
- Use NumPy basics such as array, shape, axis, type, broadcasting, advanced indexing, slicing, sorting, searching, aggregating, and statistics
- Calculate basic statistics of multidimensional data arrays and the K-Means algorithms for unsupervised learning
- Create more advanced regular expressions using grouping and named groups, negative lookaheads, escaped characters, whitespaces, character sets (and negative characters sets), and greedy/nongreedy operators
- Understand a wide range of computer science topics, including anagrams, palindromes, supersets, permutations, factorials, prime numbers, Fibonacci numbers, obfuscation, searching, and algorithmic sorting
By the end of the book, you’ll know how to write Python at its most refined, and create concise, beautiful pieces of “Python art” in merely a single line.
Programmer Humor
❓ Question: How did the programmer die in the shower? ☠️
❗ Answer: They read the shampoo bottle instructions:
Lather. Rinse. Repeat.
While working as a researcher in distributed systems, Dr. Christian Mayer found his love for teaching computer science students.
To help students reach higher levels of Python success, he founded the programming education website Finxter.com that has taught exponential skills to millions of coders worldwide. He’s the author of the best-selling programming books Python One-Liners (NoStarch 2020), The Art of Clean Code (NoStarch 2022), and The Book of Dash (NoStarch 2022). Chris also coauthored the Coffee Break Python series of self-published books. He’s a computer science enthusiast, freelancer, and owner of one of the top 10 largest Python blogs worldwide.
His passions are writing, reading, and coding. But his greatest passion is to serve aspiring coders through Finxter and help them to boost their skills. You can join his free email academy here.
Be on the Right Side of Change 🚀
- The world is changing exponentially. Disruptive technologies such as AI, crypto, and automation eliminate entire industries. 🤖
- Do you feel uncertain and afraid of being replaced by machines, leaving you without money, purpose, or value? Fear not! There a way to not merely survive but thrive in this new world!
- Finxter is here to help you stay ahead of the curve, so you can keep winning as paradigms shift.
Learning Resources 🧑💻
⭐ Boost your skills. Join our free email academy with daily emails teaching exponential with 1000+ tutorials on AI, data science, Python, freelancing, and Blockchain development!
Join the Finxter Academy and unlock access to premium courses 👑 to certify your skills in exponential technologies and programming.
New Finxter Tutorials:
Finxter Categories: