I have dataframe where I have 2 Date columns. I have to compare them and if they are different then whole row should be colored. Please check the picture. 
Please guide me how can I do that in python. Thanks in advance.
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Answer
Create styles in helper DataFrame and export to excel:
df = pd.DataFrame({'Date1':['19/3/2011','15/5/2015','18/8/2018'],
'Date2':['19/3/2011','1/1/2019','18/8/2018']})
print (df)
Date1 Date2
0 19/3/2011 19/3/2011
1 15/5/2015 1/1/2019
2 18/8/2018 18/8/2018
def highlight_diff(x):
c1 = 'background-color: red'
c2 = ''
m = x['Date1'] != x['Date2']
df1 = pd.DataFrame(c2, index=x.index, columns=x.columns)
df1.loc[m, :] = c1
return df1
(df.style
.apply(highlight_diff,axis=None)
.to_excel('styled.xlsx', engine='openpyxl', index=False))
