How to compare two data frame

Question

df1

 index           Count
 Duliajan Area      2
 HAPJAN             2
 KATHALGURI         2

df2

 Location           Category
0        NAGAJAN        0
1        JORAJAN        0
2     KATHALGURI        0
3         HEBEDA        0
4          MAKUM        0
5       BAREKURI        0
6        BAGHJAN        0
7  Duliajan Area        0
8      LANGKASHI        0
9         HAPJAN        0

I need this output:

0        NAGAJAN        0
1        JORAJAN        0
2     KATHALGURI        2
3         HEBEDA        0
4          MAKUM        0
5       BAREKURI        0
6        BAGHJAN        0
7  Duliajan Area        2
8      LANGKASHI        0
9         HAPJAN        2

Asked By: venkateswaran

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Source

Answer 1

You can use pandas merge function
for example:

df2 = df2.rename(columns={"Location": "index"})
result = pd.merge(df1, df2, on="index")

Answered By: tomerar

Answer 2

You can create dict from two columns of df1 then using map on the df2.

d = dict(zip(df1['index'], df1['Count']))
df2['Category'] = df2['Location'].map(d).fillna(df2['Category']).astype(int)
print(df2)

Output:

        Location  Category
0        NAGAJAN         0
1        JORAJAN         0
2     KATHALGURI         2
3         HEBEDA         0
4          MAKUM         0
5       BAREKURI         0
6        BAGHJAN         0
7  Duliajan Area         2
8      LANGKASHI         0
9         HAPJAN         2

Answered By: I'mahdi

Answer 3

Concat your dataframe then drop duplicates:

mapping = {'index': 'Location', 'Count': 'Category'}
out = (pd.concat([df2, df1.rename(columns=mapping)])
         .drop_duplicates('Location', keep='last')
         .reset_index(drop=True))
print(out)

# Output
        Location  Category
0        NAGAJAN         0
1        JORAJAN         0
2         HEBEDA         0
3          MAKUM         0
4       BAREKURI         0
5        BAGHJAN         0
6      LANGKASHI         0
7  Duliajan Area         2
8         HAPJAN         2
9     KATHALGURI         2

Answered By: Corralien

Answer 4

import pandas as pd

# merge the two dataframes on the Location column
df_merged = pd.merge(df1, df2, left_on='index', right_on='Location', how='outer')

# fill missing values with 0
df_merged = df_merged.fillna(0)

# rename the columns
df_merged = df_merged.rename(columns={'index': 'Location', 'Count': 'Count1', 'Category': 'Category1'})

# print the merged dataframe
print(df_merged)

Answered By: altipard

How to compare two data frame

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