Tim Peters wrote:
...
> Wait <0.3 wink>. Python's Decimal module intends to be a faithful
> implementation of IBM's proposed standard for decimal arithmetic:
>
> http://www2.hursley.ibm.com/decimal/
>
> Last December, ln, log10, exp, and exponentiation to non-integral
> powers were added to the proposed standard, but nobody yet has written
> implementation code for Python's module. [Python-Dev: somebody
> wants to volunteer for this :-)]
Here's a quick-and-dirty exp function:
def exp(x):
"""
Return e raised to the power of x.
"""
if x < 0:
return 1 / exp(-x)
partial_sum = term = 1
i = 1
while True:
term *= x / i
new_sum = partial_sum + term
if new_sum == partial_sum:
return new_sum
partial_sum = new_sum
i += 1
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