data={}
vega={}
for coin in ['BTC']:
    vega[coin] = {}
    data[coin] = {}
    data[coin]['columns']=['27-Apr-24', '28-Apr-24', '29-Apr-24', '03-May-24', '10-May-24', '17-May-24', '31-May-24']
    for expiry in data[coin]['columns']:
        vega[coin][expiry] = data[coin].get('Vega', {}).get('Total', {}).get(expiry, 0)

for coin in ['BTC']:
    data[coin]['columns']=['27-Apr-24', '28-Apr-24', '29-Apr-24', '03-May-24', '10-May-24', '17-May-24', '31-May-24', '28-Jun-24']
    for expiry in data[coin]['columns']:
        vega[coin][expiry] += data[coin].get('Vega', {}).get('Total', {}).get(expiry, 0)

Im initializing dict, and giving values if key is not present.

But however, getting

KeyError: '28-Jun-24'

on last line why?

Could someone help me figure out mistake im doing here?