Is the online Python 3 compiler free?

Yes — the Python 3 compiler on Play with Coding is free, requires no account and runs entirely in your browser.

Can I run Python 3 code on mobile?

Yes. The editor and output console are fully responsive, so you can write and run Python 3 programs from a phone or tablet.

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Python 3 Online Compiler

Practice Python 3 right here — no installs, no signups.

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Python 3 Compiler

Output

Code runs on the Play with Coding execution engine — your code is saved locally for next time.

About the Python 3 online compiler

Python's readable syntax makes it the most popular first language in the world, and this online Python 3 compiler removes the only real barrier left: installation. Write a script, press Run, read the output — including tracebacks, which are printed in full so you can practise reading them.

The runner supports the standard library, standard input, loops, comprehensions, functions, classes, dictionaries, file-free string handling, and exception handling. It is ideal for school and college assignments, interview prep, and working through the Python chapters on this site.

→Running class assignments without installing Python at home
→Practising list and dict comprehensions
→Testing string formatting and slicing rules
→Solving DSA problems that read from standard input

Python 3 sample programs you can run right now

Copy any snippet into the editor above and press Run. Each one is short on purpose — retype it from memory afterwards.

Comprehensions and dictionaries

marks = {"Aarav": 78, "Priya": 91, "Rohan": 55}

toppers = [name for name, m in marks.items() if m > 70]
print("Toppers:", toppers)
print("Average:", sum(marks.values()) / len(marks))

A comprehension replaces a four-line for loop with one readable expression.

Reading standard input

name = input("Your name: ")
n = int(input("A number: "))
for i in range(1, n + 1):
    print(f"{name} x {i} = {i}")

Type the input values in the stdin box under the editor before pressing Run — one value per line.

Common Python 3 errors and how to fix them

IndentationError: expected an indented block

Why: The line after a colon is not indented.

Fix: Indent the body by four spaces. Never mix tabs and spaces in one file.

TypeError: can only concatenate str (not "int") to str

Why: You joined a number to a string with +.

Fix: Wrap it: "Age: " + str(age), or use an f-string: f"Age: {age}".

NameError: name 'x' is not defined

Why: The variable is used before assignment or is misspelled.

Fix: Assign it earlier; remember Python is case sensitive.

Python 3 syntax cheatsheet

Concept	Syntax
Print with formatting	print(f"{name} is {age}")
List comprehension	[x * 2 for x in nums if x > 0]
Function	def add(a, b): return a + b
Class	class Dog:\n def __init__(self, n): self.n = n
Dict loop	for k, v in d.items():
Exception	try: ... except ValueError as e: ...

Python 3 compiler FAQs

Which Python version does the compiler run?

Python 3, so f-strings, type hints and the modern standard library are all available.

Can I use input() here?

Yes. Put each value on its own line in the standard input box below the editor before running.

Keep going after the compiler

Running snippets builds speed; the 17-chapter course builds understanding. Work through the Python 3 chapters, take the quiz, then claim your certificate.

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