Comment 0 for bug 1960830

Hi.

Looks like pbr does not evaluate X.dev0 package correctly, it seems to confuse it as being equal to X.

Example: from_pip_string("1.0.0.dev0") == from_pip_string("1.0.0").

According to PEP440, 1.2.dev == 1.2.dev0 but both are < 1.2.

>>> SemanticVersion.from_pip_string("1.2.0")
pbr.version.SemanticVersion(1.2.0)
>>> SemanticVersion.from_pip_string("1.2.0.dev1")
pbr.version.SemanticVersion(1.2.0.dev1)
>>> SemanticVersion.from_pip_string("1.2.0.dev0")
pbr.version.SemanticVersion(1.2.0)
>>> SemanticVersion.from_pip_string("1.2.0.dev")
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
  File "/Users/az02065/Projects/Alton/nestor_build_info/.venv/lib/python3.7/site-packages/pbr/version.py", line 145, in from_pip_string
    return klass._from_pip_string_unsafe(version_string)
  File "/Users/az02065/Projects/Alton/nestor_build_info/.venv/lib/python3.7/site-packages/pbr/version.py", line 215, in _from_pip_string_unsafe
    dev_count = int(component[3:])
ValueError: invalid literal for int() with base 10: ''

Expected behavior:

>>> SemanticVersion.from_pip_string("1.2.0.dev0")
pbr.version.SemanticVersion(1.2.0.dev0)
>>> SemanticVersion.from_pip_string("1.2.0.dev")
pbr.version.SemanticVersion(1.2.0.dev)