CODEWITHSUNDEEP
pythonpandasdatedatetimedataframe
HelloToEarth
HelloToEarth

Reputation: 2127

Filter a DataFrame by comparing dates from two different columns

I have a dataframe that looks like:

   Publication Date        Date  Value State
0        2018-12-12  2018-12-11    2.0    AL
1        2018-12-12  2018-12-11    1.0    AZ
2        2018-12-12  2018-12-11    1.0    AK
3        2018-12-12  2018-12-11    2.0    NJ
4        2018-12-12  2018-12-11    1.5    NY
5        2018-12-12  2018-12-12   12.0    AL
6        2018-12-12  2018-12-12   13.0    AZ
7        2018-12-12  2018-12-12   14.0    AK
8        2018-12-12  2018-12-12   12.0    NJ
9        2018-12-12  2018-12-12   11.5    NY
10       2018-12-13  2018-12-12    2.0    AL
11       2018-12-13  2018-12-12    3.0    AZ
12       2018-12-13  2018-12-12    6.0    AK
13       2018-12-13  2018-12-12    1.0    NJ
14       2018-12-13  2018-12-12    4.0    NY

I want to delete every occurrence where Publication date = Date + 1 so when Publication Date = 2018-12-12 and Date = 2018-12-11 all of those values are dropped.

It would look like:

 Publication Date       Date  Value State
       2018-12-12 2018-12-12   12.0    AL
       2018-12-12 2018-12-12   13.0    AZ
       2018-12-12 2018-12-12   14.0    AK
       2018-12-12 2018-12-12   12.0    NJ
       2018-12-12 2018-12-12   11.5    NY

What's the easiest way to do this?

Upvotes: 3

Views: 694

Answers (3)

cs95
cs95

Reputation: 403128

Get a mask, use it to filter df:

m = df['Publication Date'].eq(df['Date'] + pd.Timedelta(1, unit='D'))
df[~m]

  Publication Date       Date  Value State
5       2018-12-12 2018-12-12   12.0    AL
6       2018-12-12 2018-12-12   13.0    AZ
7       2018-12-12 2018-12-12   14.0    AK
8       2018-12-12 2018-12-12   12.0    NJ
9       2018-12-12 2018-12-12   11.5    NY

If "Publication Date" and "Date" are not date time columns, use pd.to_datetime(..., errors='coerce') to coerce them first.

Upvotes: 4

BENY
BENY

Reputation: 323376

Using 

df[(df.Publication-df.Date).dt.days!=1]

Upvotes: 1

Sunil Goyal
Sunil Goyal

Reputation: 588

For this, please import timedelta

from datetime import timedelta

First convert datatype of date column to datetime.

df.Date = pd.to_datetime(df.Date)
df["Publication Date"] = pd.to_datetime(df["Publication Date"])

Then filter dataframe

df = df[df["Publication Date"] != df.date + timedelta(days=1)];

Upvotes: 0

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