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pandas merge multiple dataframes

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Tinky Winky answered on October 4, 2020 Popularity 10/10 Helpfulness 6/10

answer pandas merge multiple dataframes

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pandas merge multiple dataframes

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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)

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Source: stackoverflow.com

Tags: pandas-merge python

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Contributed on Oct 04 2020

Tinky Winky

0 Answers Avg Quality 2/10

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pandas concat / merge two dataframe within one dataframe

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In [9]: result = pd.concat([df1, df4], axis=1)

Popularity 10/10 Helpfulness 6/10 Language python

Source: pandas.pydata.org

Tags: concat co

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Contributed on Jul 01 2021

Encouraging Echidna

0 Answers Avg Quality 2/10

how to merge more than 2 dataframes in python

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

Popularity 10/10 Helpfulness 5/10 Language python

Source: Grepper

Tags: merge merg

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Contributed on Sep 23 2021

Lively Lyrebird

0 Answers Avg Quality 2/10

Merge multiple dataframs

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# 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')

Popularity 9/10 Helpfulness 4/10 Language python

Source: stackoverflow.com

Tags: merge merg

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Contributed on Sep 02 2021

Terrible Turtle

0 Answers Avg Quality 2/10

merge 2 dataframes in python

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df_cd = pd.merge(df_SN7577i_c, df_SN7577i_d, how='inner', left_on = 'Id', right_on = 'Id')

Popularity 10/10 Helpfulness 4/10 Language python

Source: datacarpentry.org

Tags: merge merg

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Contributed on Feb 04 2022

Encouraging Elephant

0 Answers Avg Quality 2/10

Merge multiple dataframs

Comment

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')

Popularity 9/10 Helpfulness 3/10 Language python

Source: stackoverflow.com

Tags: merge merg

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Contributed on Sep 02 2021

Terrible Turtle

0 Answers Avg Quality 2/10

Merge multiple dataframs

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-1

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)

Popularity 9/10 Helpfulness 2/10 Language python

Source: stackoverflow.com

Tags: merge merg

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Contributed on Sep 02 2021

Terrible Turtle

0 Answers Avg Quality 2/10

Merge multiple dataframs

Comment

-1

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')

Popularity 9/10 Helpfulness 1/10 Language python

Source: stackoverflow.com

Tags: merge merg

Link to this answer
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Contributed on Sep 02 2021

Terrible Turtle

0 Answers Avg Quality 2/10

pandas merge multiple dataframes

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