Python, unpacked
Do not just run code.
Watch it think.
Paste a Python program and follow every variable, loop, and output as it happens. Everything runs privately inside your browser.
variables
conditions
loops
functions
lists
dictionaries
input
errors
references
call stack
data structures
algorithms
comparisons
complexity
01
total = 0
02for number in range(3):
03 total += number
04print(total)
TRACE // STEP 03
Python added number to total.
total0→1
number0→1