Pandas Datetime: Get all the sighting years of the unidentified flying object (ufo) and create the year as column
Pandas Datetime: Exercise-6 with Solution
Write a Pandas program to get all the sighting years of the unidentified flying object (ufo) and create the year as column.
Sample Solution :
Python Code :
import pandas as pd
df = pd.read_csv(r'ufo.csv')
df['Date_time'] = df['Date_time'].astype('datetime64[ns]')
print("Original Dataframe:")
print(df.head())
print("\nSighting years of the unidentified flying object:")
df["Year"] = df.Date_time.dt.year
print(df.head(10))
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] Sighting years of the unidentified flying object: Date_time city ... longitude Year 0 1910-06-01 15:00:00 wills point ... -96.008056 1910 1 1920-06-11 21:00:00 cicero ... -86.013333 1920 2 1929-07-05 14:00:00 buchanan (or burns) ... -118.627500 1929 3 1931-06-01 13:00:00 abilene ... -97.213611 1931 4 1939-06-01 20:00:00 waterloo ... -88.064167 1939 5 1939-07-07 02:00:00 keokuk ... -91.384722 1939 6 1941-06-01 13:00:00 ludington (hamlin lake) ... -86.452500 1941 7 1942-06-01 22:30:00 hapeville ... -84.410278 1942 8 1944-01-01 12:00:00 san diego ... -117.156389 1944 9 1944-06-01 12:00:00 los alamos ... -106.306389 1944 [10 rows x 12 columns]
Python Code Editor:
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Previous: Write a Pandas program to get all the sighting days of the unidentified flying object (ufo) between 1950-10-10 and 1960-10-10.
Next: Write a Pandas program to create a plot to present the number of unidentified flying object (UFO) reports per year.
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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