Stock Return calculation problem

[deanhystad]

Verify it yourself.

pct_change = percent_change(portfolio, "2013-01-01", "2013-01-10")
print(pct_change)  # Or just print a slice pct_change[:10]
weighted_change = pct_change * portfolio.values()
print(weighted_change)

I don't trust anyone to do anything correctly. I test and verify. You should do the same with your code.