问题描述：

Pandas无法将数据框转换为csv文件，返回错误信息：AttributeError: 'str' object has no attribute 'to_csv'

尝试用trends.to_string(index=False).to_csv('test.csv'))等其他一些例子，依然还是提示同样错误。

def main(url):
google = GoogleAnalysis(url)
codes = country_codes()
return pd.concat([
google.trends(country_code)
for country_code in codes[:len(codes) // 2]
])

def trends(self,country_code):
df = pd.DataFrame(
self._retrieve_trends(country_code),
columns=['Title', 'Search_Score'],
)
df['Country Code'] = country_code
df['Platform'] = 'Google'
return df

if __name__ == '__main__':
trends = main('https://trends.google.com/trends/trendingsearches/daily/rss')
trends.to_csv('k.csv').to_string(index=False)

问题解决：

需要输入trends函数的参数：

def trends(self,country_code):
        df = pd.DataFrame(
            self._retrieve_trends(country_code),
            columns=['Title', 'Search_Score'],
        )
        df['Country Code'] = country_code
        df['Platform'] = 'Google'
        return df

if __name__ == '__main__':
    trends = main(
 'https://trends.google.com/trends/trendingsearches/daily/rss')
trends.to_csv('k.csv')