How to drop duplicates between two columns, but keep unique values in respective columns?

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I have a df that looks like this;

col1     col2  
aa       aa
cc       bb
dd       dd 

How do I compare both columns in the same df but drop the duplicates and keep the unique in their respective columns?

new df:

col1     col2  
cc       bb

This should do the trick:

df[df[col1] != df[col2]]

How to drop duplicates between two columns, but keep unique , If 2 columns you are comparing are located and choose "Delete Row" from the context menu As you can see, only the rows with unique values are left: delete corresponding cells in the 2nd column too. So, in order to leave only unique entries in Column  It’s default value is none. After passing columns, it will consider them only for duplicates. keep: keep is to control how to consider duplicate value. It has only three distinct value and default is ‘first’. If ‘first’, it considers first value as unique and rest of the same values as duplicate.

We can construct a filter that checks if the value of df.col1 is different from df.col2, and then filter, like:

df[df.col1 != df.col2]

For example:

>>> df = pd.DataFrame([['aa', 'aa'], ['cc', 'bb'], ['dd', 'dd']], columns=['col1', 'col2'])
>>> df
  col1 col2
0   aa   aa
1   cc   bb
2   dd   dd
>>> df[df.col1 != df.col2]
  col1 col2
1   cc   bb

We here construct a new dataframe, but we can thus set df to the new dataframe, like:

df = df[df.col1 != df.col2]

Compare two columns and remove duplicates in Excel, in Excel. This can be done easily using conditional formatting to highlight values that repeat. Remove Duplicates from Multiple Columns. Remove Finding and Highlight Duplicates in Multiple Columns in Excel This would remove all the duplicate values from the column, and you would have only the unique values. drop_duplicates(self, subset=None, keep="first", inplace=False) subset : column label or sequence of labels to consider for identifying duplicate rows. By default, all the columns are used to find the duplicate rows.

If you just want to extract the rows that have the same value across columns, this should do.

import pandas as pd

data = {'a':[40, 30, 10],
       'b':[40, 20, 10]}
df = pd.DataFrame(data)
df = df[~(df['a']==df['b'])]

Output

>>> df
    a   b
0  10  40
2  30  10

Find and Remove Duplicates in Excel, How to count, remove, highlight duplicates in Excel. Now if we have the duplicate values in a column or columns (as we have in Click on the down arrow and select 'Unique' as shown in figure 2 below. We can count the unique values by writing the following formulas in cell H3 and H5 respectively. On step 1 of the wizard, you will see that your first column is already selected, so simply click Next . Note. If you want to compare not just 2 columns, but 2 tables, you need to select the entire first table in this step. On step 2 of the wizard, select the 2nd column that you want to compare against.

7 tips to deal with duplicates in MS Excel, A formula in column D extracts a unique distinct list from column B. Step 2 - Compare array with 0 LOOKUP function then returns the corresponding value in cell function to remove the error and all cell values but duplicate values  2. In the Select Duplicate & Unique Cells dialog, check Duplicates (Except 1st one) option in the Rule section. See screenshot: 3. Click Ok, a dialog pops out to remind you how many duplicates have been selected, click OK to close it. See screenshot: 4. Then press Delete key to remove the selected duplicate values. Remove Duplicates But Keep

5 easy ways to extract Unique Distinct Values, Remove duplicates but keep rest of row values with Kutools for Excel (2 steps) icon in Column D (the formula column), and check TURE from the drop down list, 2. In the Select Duplicate & Unique Cells dialog, check Duplicates (Except 1st  In this tutorial I will show you how to compare two columns in Excel so that the values that appear in both columns become highlighted and you can do something with those duplicate values. Find duplicate values in two columns. 1. Click on the Column Header to highlight Column A. Highlight column A by clicking the column header. 2.

How to remove duplicates but keep rest of the row values in Excel?, find unique or duplicate values between two lists/columns in Excel; count the unique or from Text String; Extract or Remove Part of Texts; Convert Numbers and corresponding value stays in both Column A and Column C. See screenshot:. To highlight duplicate values in two or more columns, you can use conditional formatting with on a formula based on the COUNTIF and AND functions. In the example shown, the formula used to highlight duplicate values is: =

Comments
  • So you want the rows where the value of col1 is not equal to the corresponding one in col2?
  • @WillemVanOnsem correct