Try something like:
for d in data:
if d["bid"] is not None and d["ask"] is not None:
c.writerow([str(d["currency"]),str(d["symbol"]),str(d["bid"]),str(d["ask"]),str(d["currency_volume"])])
I've used 'is not None' in case 0 or 0.0 are acceptable bid or offer values. If
you want to exclude rows with these values as well as None, you can just use:
for d in data:
if d["bid"] and d["ask"]:
# Do stuff
There are other ways to do this kind of thing, by the way. Check out list
comprehensions sometime.
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