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

Merge multiple dataframs

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')

-1

Source: stackoverflow.com

Similar codes

23 votes159 views6 answers
Pygame setup
Python
24 votes147 views6 answers
Palindrome python
Python
0 vote149 views1 answer
Django rest framework not getting form
Python
6 votes143 views2 answers
If file exist in folder then delete in python \
Python
4 votes153 views3 answers
Unable to locate package python-pip
Python
0 vote152 views1 answer
Pil.jpegimageplugin.jpegimagefile to image
Python
0 vote156 views1 answer
How to create a tuple from csv python
Python
3 votes157 views2 answers
Python json check if key exist
Python
0 vote142 views1 answer
Tkinter change button text
Python
1 vote181 views1 answer
Filter foreign fileds django_filters
Python Django