怎么将dataframe 字符串日期的时分秒去掉

Dataframe 有一列是日期，想去掉时分秒并且转为datetime类型

截取字符的前10位即可，比如

#!/usr/bin/python
# -*- coding: UTF-8 -*-
"""
@author: Roc-xb
"""
from datetime import datetime

str = "2004-10-01 00:00:00"
dt = datetime.strptime(str[0:10], "%Y-%m-%d")
print(dt)