Date Variables and URL Parameters

[pythonjm]

Thank you for the help, I will study this. I was able to work out my date problem satisfactorily. I do NOT use requests but rather urlopen to initiate conversation with my target API as follows:

myurl = urllib.request.urlopen(urlstringbuild)

urlstringbuild is a concatenated string of:

part1 = domain info and user/pass etc.
part2 = MY DATE VARIABLE WHICH NOW WORKS!
part3 = string of additional parameters

# so URLSTRINGBUILD=part1+part2+part3

# I then read the response data:
resp_data=myurl.read()

# Create a JSON dictionary from the results

json_resp=json.loads(resp_data) # API response from URL is JSON format

ALL OF THIS IS GOOD, BUT ----- when I try to ITERATE THROUGH MULTIPLE DATES, I keep getting the SAME data
back. Only the first date's data gets repeated even though I get a valid 200 response code each time I execute the
URLOPEN request. My iteration is straight forward...I ask user for a date range, populate a list containing all dates
in that range and then update my urldate parameter by looping through that list.

All seems fine, except I am not really getting the data for a different date. I loop through the correct amount of times, but no data refresh occurs.

Is there a proper way to iterate through sending repeated URL requests to a server? Do I need to clear cache somehow?

Any suggestions appreciated.

Thank you.