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 |
| --- | --- | --- | --- | --- | --- |
| Texas 1 | Wright Patman | Democratic | 1928.0 | Re-elected | Wright Patman (D) 94.7% Thomas A. Clarke (R) 5.3% |
| Texas 2 | John C. Box | Democratic | 1918.0 | Lost renomination Democratic hold | Martin Dies, Jr. (D) Unopposed |
| Texas 3 | Morgan G. Sanders | Democratic | 1920.0 | Re-elected | Morgan G. Sanders (D) Unopposed |
| Texas 4 | Sam Rayburn | Democratic | 1912.0 | Re-elected | Sam Rayburn (D) 88.8% Floyd Harry (R) 11.2% |
| Texas 6 | Luther A. Johnson | Democratic | 1922.0 | Re-elected | Luther A. Johnson (D) Unopposed |
| Texas 7 | Clay Stone Briggs | Democratic | 1918.0 | Re-elected | Clay Stone Briggs (D) Unopposed |
| Texas 8 | Daniel E. Garrett | Democratic | 1920.0 | Re-elected | Daniel E. Garrett (D) Unopposed |
| Texas 10 | James P. Buchanan | Democratic | 1912.0 | Re-elected | James P. Buchanan (D) Unopposed |
| Texas 11 | Oliver H. Cross | Democratic | 1928.0 | Re-elected | Oliver H. Cross (D) Unopposed |
| Texas 12 | Fritz G. Lanham | Democratic | 1919.0 | Re-elected | Fritz G. Lanham (D) Unopposed |
| Texas 13 | Guinn Williams | Democratic | 1922.0 | Re-elected | Guinn Williams (D) 91.1% W. C. Witcher (R) 8.9% |
| Texas 17 | Thomas L. Blanton | Democratic | 1930.0 | Re-elected | Thomas L. Blanton (D) Unopposed |
Question:
Name the number of incumbents for texas 12 
Answer:
1.0