Add type hints to handshake, inverse, mathematicalconstants

[janga1997]

#808
Only one error in mypy, regarding the file mathematicalconstants.py
We are importing e from the math module and defining a class e too, which is raising some errors.
What would you like the class e(CotoDeRatio): to be renamed to?
@marcharper @drvinceknight @Nikoleta-v3

[drvinceknight]

What would you like the class e(CotoDeRatio): to be renamed to?

Don't rename the e class simply change the imports to be:

import math

and then use math.e, math.pi etc...

[drvinceknight]

@marcharper @drvinceknight @Nikoleta-v3

Also: there's no need to ping us all. The core developers get notifications.

[janga1997]

Sorry about the pinging. Won't happen again.

[marcharper]

You can ping us if you need to just know that we already get notifications for every PR and every comment/update. We're also in very different time zones.

[drvinceknight]

@janga1997 it looks like this is forked from your short mem player (https://github.com/Axelrod-Python/Axelrod/pull/858/files#diff-a964005e2620fada6accc62bb679e816)? So merging this would include that player too but we're still discussing that on #857.