preparser incorrectly identifies integer methods that start with e as scientific notation

[mwhansen]

sage: 3.exp()
------------------------------------------------------------
   File "<ipython console>", line 1
     RealNumber('3.e')xp()
                       ^
SyntaxError: invalid syntax

sage: 3.is_square()
False

Component: misc

Issue created by migration from https://trac.sagemath.org/ticket/4459

[mwhansen]

comment:2

The same thing happens for those that start with 'r':

sage: 3.rational_reconstruction()
------------------------------------------------------------
   File "<ipython console>", line 1
     3.ational_reconstruction()

[boothby]

comment:3

Rolled into #5079