/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 vote173 views1 answer
Specific mail.search python UNSEEN SINCE T
Python
0 vote210 views1 answer
Python get factors of a number
Python
0 vote166 views1 answer
Datetime.timedelta format to string python
Python
1 vote173 views1 answer
How to separate x and y from mouse position python
Python
25 votes171 views3 answers
Ndarray to list
Python
83 votes196 views6 answers
Activate venv windows
Python
0 vote177 views1 answer
Add sign to y axis values python
Python
1 vote172 views4 answers
Binary search tree in python
Python
2 votes173 views1 answer
Values of unique from dataframe with count
Python
9 votes178 views1 answer
Except as Exception:
Python