[P/M/T]Select dataframe by multiple conditions

It’s easy to select a part of dataframe by one condition like below.

pos = df_train[df_train['Date']>0]

But when you are trying to add conditions like this

pos = df_train[df_train['Date']>0 and df_train['Coupon_id']>0]

You get error like this.

ValueError: The truth value of a Series is ambiguous. Use a.empty, a.bool(), a.item(), a.any() or a.all().

The right way to write it

pos = df_train[(df_train['Date']>0) & (df_train['Coupon_id']>0)]

[1]: https://blog.youkuaiyun.com/destiny_python/article/details/78675036