python常用函数

本文主要是介绍python常用函数，对大家解决编程问题具有一定的参考价值，需要的程序猿们随着小编来一起学习吧！

numpy.unique

numpy.unique 函数用于去除数组中的重复元素

data['date_parsed'] = pd.to_datetime(data['Date'], infer_datetime_format=True)

data['date_parsed'] = pd.to_datetime(data['Date'], format = "%m/%d/%Y", errors = 'coerce')

https://blog.csdn.net/qq_46092061/article/details/118673147

df['purchase_date'] = pd.to_datetime(df['purchase_date'])
df['year'] = df['purchase_date'].dt.year
df['weekofyear'] = df['purchase_date'].dt.weekofyear
df['month'] = df['purchase_date'].dt.month
df['dayofweek'] = df['purchase_date'].dt.dayofweek
df['weekend'] = (df.purchase_date.dt.weekday >=5).astype(int)
df['hour'] = df['purchase_date'].dt.hour

关于时序量的做差等

train['elapsed_time'] = (datetime.date(2018, 2, 1) - train['first_active_month'].dt.date).dt.days

或者

df_hist_trans_group['new_hist_purchase_date_diff'] =
(df_hist_trans_group['new_hist_purchase_date_max'] -
df_hist_trans_group['new_hist_purchase_date_min']).dt.days  可以转化类型 为整型

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