Proposal: sympy.e, similar to sympy.pi

[Jeff Pickhardt]

Sympy has sympy.pi and sympy.I, however Euler's constant is found via sympy.exp(1).

What do you guys think of the idea of creating sympy.e = sympy.exp(1)?

--

Jeff Pickhardt

[Aaron Meurer]

It's there. Use SymPy.E

Aaron Meurer

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[Chris Smith]

Jeff Pickhardt wrote:
>> Sympy has sympy.pi and sympy.I, however Euler's constant is found via
>> sympy.exp(1).
>>

I suppose the reason that E rather than e is available is to keep it from clashing with commonly used lowercase symbol names. But since pi is a lower case constant I would think that people would be aware of e. I would be in favor of changing the E to e. If someone wipes out e with a variable of the same name they can always access it through S.Exp1, too.

Chris

[Stuart Brorson]

> What do you guys think of the idea of creating sympy.e =
sympy.exp(1)?

Love it. Good idea.

Makes me think.... What about other constants, like Euler's gamma
(0.577....)? Should there be a set of constants which are built
into sympy?

Just a stray thought....

Stuart Brorson

[Aaron S. Meurer]

We already have that too:

>>> import sympy
>>> sympy.EulerGamma
EulerGamma
>>> sympy.EulerGamma.evalf()
0.577215664901533

Aaron Meurer

[Aaron S. Meurer]

I think pi is lowercase because its lowercase pi, although with that logic, gamma should be Gamma. However, they match the names from the math module:

>>> import math
>>> math.pi
3.141592653589793
>>> math.gamma(4)
6.0
>>> sympy.gamma(4)
6

On the other hand, we do have math.e, so I guess not everything matches something else. E and I (capital) are used by Maple, and I think it's probably a good convention in SymPy to make single letter names upper case, since import * is executed a lot with the sympy module.

And besides, it's probably best to leave things named the way that they are, unless there is a very good reason to change them, like there was with sum and abs.

Aaron Meurer