all Python 3mathterm

math.e

constants

Euler's number e ≈ 2.718281828459045 — the base of the natural logarithm.

Syntax

math.e

This is an ordinary double — the nearest representable value to the true e, not a symbolic constant — so math.e ** x drifts from math.exp(x) in the last bits; use math.exp() when you want the exponential. Also note that math.log(x) is already the natural logarithm: passing math.e as a second argument adds a needless division and its rounding error.

Examples

import math
print(math.e)  # → 2.718281828459045
print(math.e ** 2)  # → 7.389...
print(math.log(math.e))  # → 1.0
print(math.exp(1))  # → 2.718...
print(math.e ** math.pi)  # → 23.140...
print(round(math.e, 5))  # → 2.71828

See also

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