Pandas Datetime: Get all the sighting days of the unidentified flying object (ufo) which are less than or equal to 40 years
Pandas Datetime: Exercise-4 with Solution
Write a Pandas program to get all the sighting days of the unidentified flying object (ufo) which are less than or equal to 40 years (365*40 days).
Sample Solution :
Python Code :
import pandas as pd
import datetime
df = pd.read_csv(r'ufo.csv')
df['Date_time'] = df['Date_time'].astype('datetime64[ns]')
now = pd.to_datetime('today')
duration = datetime.timedelta(days=365*40)
print("Original Dataframe:")
print(df.head())
print("\nCurrent date:")
print(now)
print("\nSighting days of the unidentified flying object (ufo) which are less than or equal to 40 years (365*40 days):")
df = df[now - df['Date_time'] <= duration]
print(df.head())
Sample Output:
Original Dataframe: Date_time city ... latitude longitude 0 1910-06-01 15:00:00 wills point ... 32.709167 -96.008056 1 1920-06-11 21:00:00 cicero ... 40.123889 -86.013333 2 1929-07-05 14:00:00 buchanan (or burns) ... 43.642500 -118.627500 3 1931-06-01 13:00:00 abilene ... 38.917222 -97.213611 4 1939-06-01 20:00:00 waterloo ... 34.918056 -88.064167 [5 rows x 11 columns] Current date: 2019-07-11 11:55:03.162800 Sighting days of the unidentified flying object (ufo) which are less than or equal to 40 years (365*40 days): Date_time city ... latitude longitude 149 1980-01-01 01:00:00 indianapolis ... 39.768333 -86.158056 150 1980-01-01 23:30:00 chicopee ... 42.148611 -72.608333 151 1980-03-01 00:30:00 oxford ... 41.433889 -73.117222 152 1980-03-01 18:00:00 bisbee ... 31.448056 -109.927778 153 1981-01-01 00:01:00 el cajon ... 32.794722 -116.961667 [5 rows x 11 columns]
Python Code Editor:
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Previous: Write a Pandas program to get the current date, oldest date and number of days between Current date and oldest date of Ufo dataset.
Next: Write a Pandas program to get all the sighting days of the unidentified flying object (ufo) between 1950-10-10 and 1960-10-10.
What is the difficulty level of this exercise?
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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