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def timer(fn): def wrap(*a, **kw): t = time.perf_counter() r = fn(*a, **kw) print(f"took {time.perf_counter()-t:.3f}s") return r return wrap
A decorator wraps fn so extra behaviour runs before and after the call, without editing the original function
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Enter the Academy →def greet(name): print("Hello, " + name)
This Python function greet takes one argument name and prints a greeting.
def keyword defines a functionprint() outputs text to the consoleUnderstand any code, line by line — live.
Press AI Explain anywhere a code block appears and a panel streams the explanation token by token, fully markdown-rendered.