>>> Requirement('foo==1.0')
<Requirement('foo==1.0')>
>>> Requirement('foo===1.0')
<Requirement('foo===1.0')>
>>> Requirement('foo (==1.0)')
<Requirement('foo==1.0')>

>>> Requirement('foo (===1.0)')
Traceback (most recent call last):
  File "packaging/requirements.py", line 98, in __init__
    req = REQUIREMENT.parseString(requirement_string)
  File "pyparsing.py", line 1955, in parseString
    raise exc
  File "pyparsing.py", line 3814, in parseImpl
    raise ParseException(instring, loc, self.errmsg, self)
pyparsing.ParseException: Expected stringEnd, found '('  (at char 4), (line:1, col:5)

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
  File "packaging/requirements.py", line 100, in __init__
    raise InvalidRequirement(
packaging.requirements.InvalidRequirement: Parse error at "'(===1.0)'": Expected stringEnd