| math.inf |
∞, ≡ float(“inf”) |
| math.prod(iterable, *, start=1) |
def prod(iterable, *, start=1):
for element in iterable:
start *= element
return start
|
| math.floor(f) -> int |
⌊ f ⌋ |
| math.ceil(f) -> int |
⌈ f ⌉ |
| math.sqrt(x) -> float |
≡ x ** (1/2), if x >= 0
math.sqrt(x) is significantly faster than x ** 0.5.- About processing negative numbers:
That means sqrt() only works on positive values.
But the ** operator is able to return a complex number,
note the weird rounding error where the real part should be zero
(ex: (-4) ** 0.5 ⇒ (1.2246467991473532e-16+2j)).
cmath.sqrt() returns the perfect complex value probably
(ex: cmath.sqrt(-4) ⇒ 2j),
because as opposed to **, sqrt()
is a specialized square root computation,
not just a float pow method.
|
| math.isqrt(x: int) -> int |
≡ floor(x ** (1/2)) |
| math.pow(x, y[, z]) |
≡ (x ** (y)) [% z]
math.pow(x, y, z) is quite faster than (x ** y) % z
其時間複雜度為 O(log(y))
|
Last Updated on 2025/08/13 by A1go
