Pandas: Index of certain element of a Series

Last update on May 28 2022 13:03:04 (UTC/GMT +8 hours)

Pandas Indexing: Exercise-18 with Solution

Write a Pandas program to get the index of an element of a given Series.

Sample Solution:

Python Code :

import pandas as pd
ds = pd.Series([1,3,5,7,9,11,13,15], index=[0,1,2,3,4,5,7,8])
print("Original Series:")
print(ds)
print("\nIndex of 11 in the said series:")
x = ds[ds == 11].index[0]
print(x)

Sample Output:

Original Series:
0     1
1     3
2     5
3     7
4     9
5    11
7    13
8    15
dtype: int64

Index of 11 in the said series:
5

Python Code Editor:

Have another way to solve this solution? Contribute your code (and comments) through Disqus.

Previous: Write a Pandas program to extract elements in the given positional indices along an axis of a dataframe.

Next: Write a Pandas program to select a specific row of given series/dataframe by integer index.

What is the difficulty level of this exercise?

Test your Programming skills with w3resource's quiz.

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