Situation

At the moment, we don't have a function which checks a version string and returns True/False values.

The user is forced to parse the version string and have to check for a ValueError exception:

import semver

try:
   version = "..."
   semver.VersionInfo.parse(version)
   # if we are still here, then it's true
except ValueError:
   # seems, version wasn't a good semver version

I think, this is a bit cumbersome.

Proposed Solution

It would be nice if we could do something like this:

version = "..."
if semver.VersionInfo.isvalid(version):
   print("Good version :-)!")
else:
  print("Bad version :-(")

Open questions:

1. Is this use case useful?
2. Currently, I see semver.VersionInfo.isvalid() as a classmethod. Should we better place this function outside the class, like semver.isvalid()?
3. Regardless of the location, is the name ok? It resembles the is...() functions from the str datatype.