import pandas as pd

nowcoder = pd.read_csv("nowcoder.csv", parse_dates=["date"])
nowcoder = nowcoder.set_index("date")
nowcoder.dropna()
# daily_num = nowcoder.groupby(nowcoder.index.date)['question_id'].count()
# print(daily_num)
daily_num = nowcoder["question_id"].resample("D").nunique()
print(daily_num)