กำลังไฟ 5kw ยี่ห้อไหนครับ?
What is the number of brand where the power is 5kw?
{'df': {'branding': ['brand1', 'brand2', 'brand3'], 'power__kw_': ['5kW', 'not 5kW', '5kW']}}
df[df['power__kw_'] == '5kW']['branding'].count()