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 | James O'Connor | Democratic | 1918.0 | Re-elected | James O'Connor (D) Unopposed |
| Louisiana 2 | Henry Garland Dupré | Democratic | 1908.0 | Re-elected | Henry Garland Dupré (D) Unopposed |
| Louisiana 3 | Whitmell P. Martin | Democratic | 1914.0 | Re-elected | Whitmell P. Martin (D) Unopposed |
| Louisiana 4 | John T. Watkins | Democratic | 1904.0 | Lost renomination Democratic hold | John N. Sandlin (D) Unopposed |
| Louisiana 5 | Riley Joseph Wilson | Democratic | 1914.0 | Re-elected | Riley Joseph Wilson (D) Unopposed |
| Louisiana 6 | Jared Y. Sanders, Sr. | Democratic | 1916.0 | Retired to run for U.S. Senate Democratic hold | George K. Favrot (D) Unopposed |
| Louisiana 7 | Ladislas Lazaro | Democratic | 1912.0 | Re-elected | Ladislas Lazaro (D) Unopposed |
Question:
How many candidates were there when Henry Garland Dupré was the incumbent? 
Answer:
1.0