date iteration

daterange.py

#!/usr/bin/env python
# coding=utf-8
from datetime import datetime, timedelta


def daterange(start, stop, step_minutes=1):
    current = start
    step = timedelta(minutes=step_minutes)
    if step_minutes > 0:
        while current < stop:
            yield current
            current += step
    elif step_minutes < 0:
        while current > stop:
            yield current
            current += step
    else:
        raise ValueError("daterange() step_days argument must not be zero")