I have a dateframe that looks like:
|Launch |Delivery |Step-up
0|2020-04-22 |102 |NaT
1|2020-09-02 |140 |2021-01-03
2|2019-12-24 |90 |2020-04-20
3|2020-06-14 |nan |2022-02-18
...
i want to do some calculations with those columns to create a new column called maturity.
if there is nan in the delivery then the maturity for that row should also be nan.
if there is no step-up then maturity = Launch + Delivery.
if step-up does exist and it is < launch + Delivery, then maturity = step-up.
else the maturity is launch + delivery.
so ideally the dataframe should look like:
|Launch |Delivery |Step-up |Maturity
0|2020-04-22 |10 |NaT |2020-05-02
1|2020-09-02 |14 |2020-09-10 |2020-09-10
2|2019-12-24 |9 |2020-01-20 |2020-01-02
3|2020-06-14 |nan |2020-07-18 |nan
...
You just need to iterate throw your dataframe, create a new dataframe and merge them.
Preliminaries
import pandas as pd
import datetime
data = {'Launch':['2020-04-22', '2020-09-02', '2019-12-24', '2020-06-14'],
'Delivery':['10', '14', '9', 'nan'],
'Step-up':['NaT', '2021-01-03', '2020-04-20', '2022-02-18']}
df = pd.DataFrame(data)
Here the section that answers your question:
# create a new dataframe
append = {'Maturity':[]}
# iterate throw all rows of the old dataframe
for index, row in df.iterrows():
# for each row make your computation
if row['Delivery'] == 'nan':
# append your data to the new dataframe
append['Maturity'].append('nan')
elif row['Step-up'] == 'NaT':
append['Maturity'].append(datetime.datetime.strptime(row['Launch'], '%Y-%m-%d') + datetime.timedelta(days=int(row['Delivery'])))
elif row['Step-up'] != 'NaT':
launch_plus_delivery = datetime.datetime.strptime(row['Launch'], '%Y-%m-%d') + datetime.timedelta(days=int(row['Delivery']))
stepup = datetime.datetime.strptime(row['Step-up'], '%Y-%m-%d')
if stepup < launch_plus_delivery:
append['Maturity'].append(row['Step-up'])
else:
append['Maturity'].append(launch_plus_delivery)
# add your new data as a new column to the old dataframe
df['Maturity'] = append['Maturity']
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