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

0 vote243 views1 answer
Perform a right outer join of self and other.
Python
0 vote212 views1 answer
Pathlib path forward or back slahses
Python
0 vote198 views1 answer
All the symbols on a keyboard python list
Python
0 vote194 views1 answer
Bs4 innerhtml
Python
29 votes209 views5 answers
Static dirs django
Python
9 votes194 views1 answer
Delete object from table django
Python
4 votes176 views2 answers
Python print time
Python
25 votes231 views6 answers
How to get input from user in python
Python
0 vote316 views1 answer
Flask on gevent over https
Python
0 vote197 views1 answer
Forward fill pandas ffill
Python