问题描述
empty string like this isnull() not find empty string
conn = connect(host='localhost',port=3306,user='root',password='root',database='spiderdata',charset='utf8')
df = pd.read_sql('select * from beikedata_community1',con=conn)
df
df.subway.isnull()
**i want to use 'isnull()' find missing value,but it's not support empty string,what can i do? thanks very much!**
解决方法
您可以使用 print(df.replace(r' ','NaN')) 。 这将用 NaN 替换空单元格。