Below is the list of tables from the database along with their columns and datatype. Need to generate an accurate SQL query for the question.
Only use the columns present in the respective table. Only use the columns which are required to generate the SQL query. Only use table joins if required and not otherwise.

### Tables ###
TABLE: CREATE TABLE table_29154676_1 ( season_no VARCHAR, written_by VARCHAR )

### Question ###
How many episodes were written by Warren Leight?

### Accurate SQL ###

SELECT COUNT(season_no) FROM table_29154676_1 WHERE written_by = "Warren Leight"