from datetime import datetime as dt

SEP = "\",\""
LS = "\""
LE = "\""
NL = LS + "\n" + LE



def flat_dict_to_csv(data):
	keys = set()
	for i in data:
		keys = keys.union(set(i.keys()))
	keys = sorted(keys)
	out = SEP.join(keys)
	for i in data:
		out += NL + SEP.join([escape(i.get(j, "")) for j in keys])
	return LS + out + LE


def escape(value):
	val = str(value)
	val = val.replace(".", ",")
	return val

def pretty_ts(timestamp, fmt="%Y-%m-%d %H:%M:%S"):
	d = dt.fromtimestamp(int(timestamp)/1000.0)
	return d.strftime(fmt)