user: Question: Name the number of pinyin where simplified is 河西区
Columns: ['English Name', 'Simplified', 'Traditional', 'Pinyin', 'Area', 'Population', 'Density']
Types: ['text', 'text', 'text', 'text', 'text', 'real', 'text']
Sample row: ['Hexi District', '河西区', '河西區', 'Héxī Qū', '10', 134026.0, '13,403']
SQL:

assistant: SELECT COUNT("Pinyin") FROM "Table" WHERE "Simplified" = '河西区';