pandas append csv files a+
df.to_csv('my_csv.csv', mode='a', header=False)pandas append csv files a+
df.to_csv('my_csv.csv', mode='a', header=False)update csv file in python using pandas
I was able to get the desired data frame.
import pandas as pd
import numpy as np
df1 = pd.read_csv('\dir\test1.csv', index_col=0)
df2 = pd.read_csv('\dir\test2.csv', index_col=0)
new_index = list(set(list(df1.index.values)+list(df2.index.values)))
df2 = df2.reindex(new_index)
df2 = df2.join(df1, rsuffix='_P')
df2 = df2.loc[:,~df2.columns.str.endswith('_P')].fillna(df1).fillna(0)
df2.sort_index(inplace=True)
print df2.to_string()
col2 col3 col4 col1
test1 8 7 15 11
test3 5 9 10 9
test5 9 -1 0 12
test7 1 4 9 0
test9 11 10 12 0Copyright © 2021 Codeinu
Forgot your account's password or having trouble logging into your Account? Don't worry, we'll help you to get back your account. Enter your email address and we'll send you a recovery link to reset your password. If you are experiencing problems resetting your password contact us
