Well this is rather fun. Not done any coding outside of simple VBA for years (about 20), and I'm trying this as a vehicle for learning python.
expense=[1956,1994,457,1654,2003,1902,1741,1494,1597,1129,1146,1589,1989,1093,1881,1288,1848,1371,1508,1035,1813,1335,1634,1102,1262,1637,1048,1807,1270,1528,1670,1803,1202,1294,1570,1640,1484,1872,1140,1207,1485,1781,1778,1772,1334,1267,1045,1194,1873,1441,1557,1414,1123,1980,1527,1591,1665,1916,1662,1139,1973,1258,1041,1134,1609,1554,1455,1124,1478,1938,1759,1281,1410,1511,930,1319,1302,1827,1216,1404,1460,2002,1590,1817,1341,1631,1608,1382,1158,1594,1049,1804,1555,1753,447,1021,1079,609,1766,1327,1851,1052,1737,1175,1043,1945,1573,1113,1724,1203,1856,1682,1623,1135,1015,1423,1412,1315,1375,1895,1351,1530,1758,1445,1518,1819,1567,1305,1919,1952,1432,1099,1476,1883,1871,1900,1442,1393,1214,1283,1538,1391,1008,1109,1621,1876,1998,1032,1324,1927,481,1732,1370,1683,1199,1465,1882,1293,1671,1456,1197,1506,1381,1469,1830,1957,1850,1184,1564,1170,1943,1131,1867,1208,1788,1337,1722,1760,1651,1069,1574,1959,1770,66,1190,1606,1899,1054,980,1693,1173,1479,1333,1579,1720,1782,1971,1438,1178,1306]
for index, num1 in enumerate(expense):
for num2 in expense[index+1:]:
if num1+num2 == 2020:
print (num1, num2, num1+num2, num1*num2)
And day 2: (for day two, I learned to read the input data from a text file into a list rather than declaring the data in the list)