Python时间戳转换为字符串与字符串转换为时间戳

if __name__ == '__main__':
    # 时间戳
    import time
    seconds = time.time()
 
    # 时间戳转换为字符串
    print(time.strftime("%Y-%m-%d %H:%M:%S", time.localtime(seconds)))
 
    # 字符串转换为时间戳
    print(time.mktime(time.strptime("2018-08-07", "%Y-%m-%d")))

    if len(df) > 0:
        # 字符串转换为时间戳
        x = list(df['日期'])
        x1 = [time.mktime(time.strptime(c, "%Y-%m-%d")) for c in x]
        df['日期时间戳'] = x1
        df.sort_values(by='日期时间戳', inplace=True, ascending=True)
 

pm_str = '6/18/2017 9:52:37 PM'
stTemp = time.strptime(pm_str, "%m/%d/%Y %I:%M:%S %p")
print(stTemp)
str_time = time.strftime("%m-%d-%Y_%H%M%S", stTemp)
print(str_time)