Pandas: Create a Series of Timestamps from a DataFrame of integer or string columns

Last update on May 28 2022 13:05:05 (UTC/GMT +8 hours)

Pandas Time Series: Exercise-13 with Solution

Write a Pandas program to create a series of Timestamps from a DataFrame of integer or string columns. Also create a series of Timestamps using specified columns.

Sample Solution:

Python Code :

import pandas as pd
df = pd.DataFrame({'year': [2018, 2019, 2020],
                   'month': [2, 3, 4],
                   'day': [4, 5, 6],
                   'hour': [2, 3, 4]})
print("Original dataframe:")
print(df)
result = pd.to_datetime(df)
print("\nSeries of Timestamps from the said dataframe:")
print(result)
print("\nSeries of Timestamps using specified columns:")
print(pd.to_datetime(df[['year', 'month', 'day']]))

Sample Output:

Original dataframe:
   year  month  day  hour
0  2018      2    4     2
1  2019      3    5     3
2  2020      4    6     4

Series of Timestamps from the said dataframe:
0   2018-02-04 02:00:00
1   2019-03-05 03:00:00
2   2020-04-06 04:00:00
dtype: datetime64[ns]

Series of Timestamps using specified columns:
0   2018-02-04
1   2019-03-05
2   2020-04-06
dtype: datetime64[ns]

Python Code Editor:

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Previous: Write a Pandas program to convert year and day of year into a single datetime column of a dataframe.
Next: Write a Pandas program to check if a day is a business day (weekday) or not.

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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