Pandas Datetime: Generate sequences of fixed-frequency dates and time spans
Pandas Datetime: Exercise-14 with Solution
Write a Pandas program to generate sequences of fixed-frequency dates and time spans.
Sample Solution :
Python Code :
import pandas as pd
dtr = pd.date_range('2018-01-01', periods=12, freq='H')
print("Hourly frequency:")
print(dtr)
dtr = pd.date_range('2018-01-01', periods=12, freq='min')
print("\nMinutely frequency:")
print(dtr)
dtr = pd.date_range('2018-01-01', periods=12, freq='S')
print("\nSecondly frequency:")
print(dtr)
dtr = pd.date_range('2018-01-01', periods=12, freq='2H')
print("nMultiple Hourly frequency:")
print(dtr)
dtr = pd.date_range('2018-01-01', periods=12, freq='5min')
print("\nMultiple Minutely frequency:")
print(dtr)
dtr = pd.date_range('2018-01-01', periods=12, freq='BQ')
print("\nMultiple Secondly frequency:")
print(dtr)
dtr = pd.date_range('2018-01-01', periods=12, freq='w')
print("\nWeekly frequency:")
print(dtr)
dtr = pd.date_range('2018-01-01', periods=12, freq='2h20min')
print("\nCombine together day and intraday offsets-1:")
print(dtr)
dtr = pd.date_range('2018-01-01', periods=12, freq='1D10U')
print("\nCombine together day and intraday offsets-2:")
print(dtr)
Sample Output:
Hourly frequency: DatetimeIndex(['2018-01-01 00:00:00', '2018-01-01 01:00:00', '2018-01-01 02:00:00', '2018-01-01 03:00:00', '2018-01-01 04:00:00', '2018-01-01 05:00:00', '2018-01-01 06:00:00', '2018-01-01 07:00:00', '2018-01-01 08:00:00', '2018-01-01 09:00:00', '2018-01-01 10:00:00', '2018-01-01 11:00:00'], dtype='datetime64[ns]', freq='H') Minutely frequency: DatetimeIndex(['2018-01-01 00:00:00', '2018-01-01 00:01:00', '2018-01-01 00:02:00', '2018-01-01 00:03:00', '2018-01-01 00:04:00', '2018-01-01 00:05:00', '2018-01-01 00:06:00', '2018-01-01 00:07:00', '2018-01-01 00:08:00', '2018-01-01 00:09:00', '2018-01-01 00:10:00', '2018-01-01 00:11:00'], dtype='datetime64[ns]', freq='T') Secondly frequency: DatetimeIndex(['2018-01-01 00:00:00', '2018-01-01 00:00:01', '2018-01-01 00:00:02', '2018-01-01 00:00:03', '2018-01-01 00:00:04', '2018-01-01 00:00:05', '2018-01-01 00:00:06', '2018-01-01 00:00:07', '2018-01-01 00:00:08', '2018-01-01 00:00:09', '2018-01-01 00:00:10', '2018-01-01 00:00:11'], dtype='datetime64[ns]', freq='S') nMultiple Hourly frequency: DatetimeIndex(['2018-01-01 00:00:00', '2018-01-01 02:00:00', '2018-01-01 04:00:00', '2018-01-01 06:00:00', '2018-01-01 08:00:00', '2018-01-01 10:00:00', '2018-01-01 12:00:00', '2018-01-01 14:00:00', '2018-01-01 16:00:00', '2018-01-01 18:00:00', '2018-01-01 20:00:00', '2018-01-01 22:00:00'], dtype='datetime64[ns]', freq='2H') Multiple Minutely frequency: DatetimeIndex(['2018-01-01 00:00:00', '2018-01-01 00:05:00', '2018-01-01 00:10:00', '2018-01-01 00:15:00', '2018-01-01 00:20:00', '2018-01-01 00:25:00', '2018-01-01 00:30:00', '2018-01-01 00:35:00', '2018-01-01 00:40:00', '2018-01-01 00:45:00', '2018-01-01 00:50:00', '2018-01-01 00:55:00'], dtype='datetime64[ns]', freq='5T') Multiple Secondly frequency: DatetimeIndex(['2018-03-30', '2018-06-29', '2018-09-28', '2018-12-31', '2019-03-29', '2019-06-28', '2019-09-30', '2019-12-31', '2020-03-31', '2020-06-30', '2020-09-30', '2020-12-31'], dtype='datetime64[ns]', freq='BQ-DEC') Weekly frequency: DatetimeIndex(['2018-01-07', '2018-01-14', '2018-01-21', '2018-01-28', '2018-02-04', '2018-02-11', '2018-02-18', '2018-02-25', '2018-03-04', '2018-03-11', '2018-03-18', '2018-03-25'], dtype='datetime64[ns]', freq='W-SUN') Combine together day and intraday offsets-1: DatetimeIndex(['2018-01-01 00:00:00', '2018-01-01 02:20:00', '2018-01-01 04:40:00', '2018-01-01 07:00:00', '2018-01-01 09:20:00', '2018-01-01 11:40:00', '2018-01-01 14:00:00', '2018-01-01 16:20:00', '2018-01-01 18:40:00', '2018-01-01 21:00:00', '2018-01-01 23:20:00', '2018-01-02 01:40:00'], dtype='datetime64[ns]', freq='140T') Combine together day and intraday offsets-2: DatetimeIndex([ '2018-01-01 00:00:00', '2018-01-02 00:00:00.000010', '2018-01-03 00:00:00.000020', '2018-01-04 00:00:00.000030', '2018-01-05 00:00:00.000040', '2018-01-06 00:00:00.000050', '2018-01-07 00:00:00.000060', '2018-01-08 00:00:00.000070', '2018-01-09 00:00:00.000080', '2018-01-10 00:00:00.000090', '2018-01-11 00:00:00.000100', '2018-01-12 00:00:00.000110'], dtype='datetime64[ns]', freq='86400000010U')
Python Code Editor:
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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")
Ref: https://bit.ly/3fy0R6m
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