Unless I'm missing something, just combine strip and list comprehension.
Code:
from bs4 import BeautifulSoup as bsoup
ofile = open("test.html", "r")
soup = bsoup(ofile)
res = ",".join([a.get_text().strip() for a in soup.find("div", class_="path").find_all("a")])
print res
Result:
abc,def,ghi
[Finished in 0.2s]