如何将值添加到熊猫数据框中的空列？

Question

I'm trying to add values into a new pandas column sp['New Address'] by using a Google Maps API Key and a for-loop that uses the addresses in the column sp['ASL Address (PAPER)-REFERENCE'] as a string query.

I've tried to create an empty list ( addresses ) that appends the searched addresses when the for-loop is run, and then run another for-loop that is supposed to loop through each row in sp['New Address'] and paste the addresses searched in the original for-loop:

for address in sp['ASL Address (PAPER)-REFERENCE']:
    api_key = "API Key"
    url = "https://maps.googleapis.com/maps/api/place/textsearch/json?"
    query = address
    r = requests.get(url + 'query=' + query + '&key=' + api_key)
    x = r.json()
    z = x['results']
    for i in range(len(z)):
        for row in sp['New Address']:
            addresses = []
            sp['New Address'] = addresses.append((z[i]['formatted_address']))

I expected the rows in sp['New Address'] to be filled with an address such as '21 Laurel Brook Rd, Middletown, CT 06457, USA'. However whenever I run the code, sp['New Address'] is still empty.

Answer 1

Your bug is simply that .append() on a list always returns None , because it works in-place

(But if you'd attempted to debug this with a few humble print statements in each loop, you would have found that by yourself)