题解 | #牛客网的每日练题量#
牛客网的每日练题量
https://www.nowcoder.com/practice/c5307933102d47c6895679bc62c9e5a9
import pandas as pd
df = pd.read_csv('nowcoder.csv')
df['date'] = pd.to_datetime(df['date'],format='%Y-%m-%d')
df = df[(df['date'].dt.year==2021)&(df['date'].dt.month==12)]
print(df.groupby('date')['user_id'].count())
