/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 vote140 views1 answer
Extract label from tf data
Python
0 vote132 views1 answer
Pause and resume threads python
Python
0 vote152 views2 answers
Dataframe rolling window
Python
9 votes128 views3 answers
Check if tensorflow gpu is installed
Python
1 vote131 views1 answer
How to fill na python
Python
0 vote175 views1 answer
Django strptime
Python Django
0 vote151 views1 answer
Flipping an image with cv2
Python
14 votes144 views3 answers
How to get id of user discord.py
Python
0 vote132 views1 answer
Phyton 2.7 convert timedelta to string
Python
0 vote179 views1 answer
Python using string to access objects
Python