Pandas: Indexing by Time

Last update on May 28 2022 13:38:22 (UTC/GMT +8 hours)

Pandas Time Series: Exercise-7 with Solution

Write a Pandas program to create a time series object that has time indexed data. Also select the dates of same year and select the dates between certain dates.

Sample Solution:

Python Code :

import pandas as pd
index = pd.DatetimeIndex(['2011-09-02', '2012-08-04',
                          '2015-09-03', '2010-08-04',
                          '2015-03-03', '2011-08-04',
                          '2015-04-03', '2012-08-04'])

s_dates = pd.Series([0, 1, 2, 3, 4, 5, 6, 7], index=index)

print("Time series object with indexed data:")
print(s_dates)
print("\nDates of same year:")
print(s_dates['2015'])
print("\nDates between 2012-01-01 and 2012-12-31")
print(s_dates['2012-01-01':'2012-12-31'])

Sample Output:

Time series object with indexed data:
2011-09-02    0
2012-08-04    1
2015-09-03    2
2010-08-04    3
2015-03-03    4
2011-08-04    5
2015-04-03    6
2012-08-04    7
dtype: int64

Dates of same year:
2015-09-03    2
2015-03-03    4
2015-04-03    6
dtype: int64

Dates between 2012-01-01 and 2012-12-31
2012-08-04    1
2012-08-04    7
dtype: int64

Python Code Editor:

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Previous: Write a Pandas program to create a time-series from a given list of dates as strings.
Next: Write a Pandas program to create a date range using a startpoint date and a number of periods.

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Python: Tips of the Day

Find current directory and file's directory:

To get the full path to the directory a Python file is contained in, write this in that file:

import os 
dir_path = os.path.dirname(os.path.realpath(__file__))

(Note that the incantation above won't work if you've already used os.chdir() to change your current working directory, since the value of the __file__ constant is relative to the current working directory and is not changed by an os.chdir() call.)

To get the current working directory use

import os
cwd = os.getcwd()

Documentation references for the modules, constants and functions used above:

The os and os.path modules.
The __file__ constant
os.path.realpath(path) (returns "the canonical path of the specified filename, eliminating any symbolic links encountered in the path")
os.path.dirname(path) (returns "the directory name of pathname path")
os.getcwd() (returns "a string representing the current working directory")
os.chdir(path) ("change the current working directory to path")

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