# Write a program in Python to print the first and last three days from a given time series data

Assume, you have time series and the result for the first and last three days from the given series as,

first three days:
2020-01-01    Chennai
2020-01-03    Delhi
Freq: 2D, dtype: object
last three days:
2020-01-07    Pune
2020-01-09    Kolkata
Freq: 2D, dtype: object

To solve this, we will follow the steps given below −

## Solution

• Define a series and store it as data.

• Apply pd.date_range() function inside start date as ‘2020-01-01’ and periods = 5, freq =’2D’ and save it as time_series

time_series = pd.date_range('2020-01-01', periods = 5, freq ='2D')
• Set date.index = time_series

• Print the first three days using data.first(’3D’) and save it as first_day

first_day = data.first('3D')
• Print the last three days using data.last(’3D’) and save it as last_day

last_day = data.last('3D')

### Example

Let’s check the following code to get a better understanding −

import pandas as pd
data = pd.Series(['Chennai', 'Delhi', 'Mumbai', 'Pune', 'Kolkata'])
time_series = pd.date_range('2020-01-01', periods = 5, freq ='2D')
data.index = time_series
print("time series:\n",data)
first_day = data.first('3D')
print("first three days:\n",first_day)
last_day = data.last('3D')
print("last three days:\n",last_day)

### Output

time series:
2020-01-01    Chennai
2020-01-03    Delhi
2020-01-05    Mumbai
2020-01-07    Pune
2020-01-09    Kolkata
Freq: 2D, dtype: object
first three days:
2020-01-01    Chennai
2020-01-03    Delhi
Freq: 2D, dtype: object
last three days:
2020-01-07    Pune
2020-01-09    Kolkata
Freq: 2D, dtype: object

Updated on: 25-Feb-2021

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