try Mercurial API

gistfile1.py

>>> from mercurial import ui, hg
>>> repo = hg.repository(ui=ui.ui(), path='.', create=True)
# create a repository
>>> repo
<mercurial.localrepo.localrepository object at 0x1019581d0>
>>> f = open("foo", "w")
>>> f.write("foofoo")
>>> f.close()
>>> repo.status(unknown=True)
([], [], [], [], ['foo'], [], [])
# exists an unknown file
>>> repo.dirstate
<mercurial.dirstate.dirstate object at 0x1019658d0>
>>> repo.dirstate.add("foo")
# add an unknown file
>>> repo.status()
([], ['foo'], [], [], [], [], [])
# exists an added file
>>> repo.dirstate.write()
>>> repo.commit(text="hello, foo")
# commit to repository with a message
>>> repo.status()
([], [], [], [], [], [], [])
>>> repo[0]
<changectx 389f25c9c254>
# a change context
>>> repo[0].files()
['foo']
>>> repo[0].changeset()
('\xe8\x05\x99\xac\xae\x8b\xa4\xfa\x87\x9c\x1e\xc4\x84\xab6?=\x90\xcc\x05', 'yoshiyasu', (1303479637.0, -32400), ['foo'], 'hello, foo', {'branch': 'default'})
>>> repo[0].filectx("foo")
<filectx foo@389f25c9c254>
# a file context
>>> repo[0].filectx("foo").data()
'foofoo'