Please read the following table in Markdown format and then answer the question according to the table. Table cells in one row are seperated by '|', and different rows are seperated by '
'.

Table:
| District | Incumbent | Party | First elected | Result | Candidates |
| --- | --- | --- | --- | --- | --- |
| Louisiana 1 | F. Edward Hebert | Democratic | 1940.0 | Re-elected | F. Edward Hebert (D) Unopposed |
| Louisiana 2 | Hale Boggs | Democratic | 1946.0 | Re-elected | Hale Boggs (D) 68.6% Leonard L. Limes (R) 31.4% |
| Louisiana 3 | Edwin E. Willis | Democratic | 1948.0 | Re-elected | Edwin E. Willis (D) 59.7% Hall M. Lyons (R) 40.3% |
| Louisiana 4 | Joe Waggonner | Democratic | 1961.0 | Re-elected | Joe Waggonner (D) Unopposed |
| Louisiana 5 | Otto Passman | Democratic | 1946.0 | Re-elected | Otto Passman (D) Unopposed |
| Louisiana 6 | James H. Morrison | Democratic | 1942.0 | Lost renomination Democratic hold | John Rarick (D) 76.6% Crayton G. Hall (R) 23.4% |
| Louisiana 7 | Edwin Edwards | Democratic | 1965.0 | Re-elected | Edwin Edwards (D) Unopposed |
Question:
What's the year of the first election of the district whose incumbent is Edwin E. Willis?
Answer:
1948.0