/Python/How to merge more than 2 dataframes in python

How to merge more than 2 dataframes in python

How to merge two dataframes

df_merge_col = pd.merge(df_row, df3, on='id')

df_merge_col

Pandas merge multiple dataframes

import pandas as pd
from functools import reduce

# compile the list of dataframes you want to merge
data_frames = [df1, df2, df3]
df_merged = reduce(lambda  left,right: pd.merge(left,right,on=['key_col'],
                                            how='outer'), data_frames)

Source: stackoverflow.com

How to merge more than 2 dataframes in python

df = pd.concat( [df1,df2,df3], ignore_index=True )

Merge multiple dataframs

# compile the list of dataframes you want to merge
data_frames = [df1, df2, df3]

df_merged = reduce(lambda  left,right: pd.merge(left,right,on=['DATE'],
                                            how='outer'), data_frames)

# if you want to fill the values that don't exist in the lines of merged dataframe simply fill with required strings as

df_merged = reduce(lambda  left,right: pd.merge(left,right,on=['DATE'],
                                            how='outer'), data_frames).fillna('void')

Source: stackoverflow.com

Merge multiple dataframs

from functools import reduce

Name of a column in all dataframes is 'DATE'

df_merged = reduce(lambda  left,right: pd.merge(left,right,on=['DATE'],
                                            how='outer'), data_frames)

# if you want to fill the values that don't exist in the lines of merged dataframe simply fill with required strings as

df_merged = reduce(lambda  left,right: pd.merge(left,right,on=['DATE'],
                                            how='outer'), data_frames).fillna('void')

Source: stackoverflow.com

Merge multiple dataframs

from functools import reduce
import pandas as pd

dfs = [df1, df2, df3, ...]
nan_value = 0

# solution 1 (fast)
result_1 = pd.concat(dfs, join='outer', axis=1).fillna(nan_value)

# solution 2
result_2 = reduce(lambda df_left,df_right: pd.merge(df_left, df_right, 
                                              left_index=True, right_index=True, 
                                              how='outer'), 
                  dfs).fillna(nan_value)

-1

Source: stackoverflow.com

Similar codes

0 vote149 views1 answer
How do i activate python on windows
Python
0 vote133 views1 answer
Get number of occurrences of substring case independent python
Python
0 vote146 views1 answer
Drop portion of string in dataframe python
Python
-3 votes131 views1 answer
Find key by value python
Python
0 vote146 views1 answer
Pygame scroll event
Python
0 vote159 views1 answer
Django command to fetch all columns of a table
Python
3 votes140 views2 answers
Discord.py edit messages
Python
0 vote141 views1 answer
How to get the memory location of a varible in python
Python
0 vote154 views1 answer
After groupby how to add values in two rows to a list
Python
0 vote172 views1 answer
Python minimal app
Python