Please note, this is a STATIC archive of website www.w3resource.com from 19 Jul 2022, cach3.com does not collect or store any user information, there is no "phishing" involved.
w3resource

NumPy: Count the lowest index of "P" in a given array, element-wise

NumPy String: Exercise-16 with Solution

Write a NumPy program to count the lowest index of "P" in a given array, element-wise.

Sample Solution:-

Python Code:

import numpy as np
x1 = np.array(['Python', 'PHP', 'JS', 'EXAMPLES', 'HTML'], dtype=np.str)
print("\nOriginal Array:")
print(x1)
print("count the lowest index of ‘P’:")
r = np.char.find(x1, "P")
print(r)

Sample Input:

(['Python', 'PHP', 'JS', 'EXAMPLES', 'HTML'], dtype=np.str)

Sample Output:

Original Array:
['Python' 'PHP' 'JS' 'EXAMPLES' 'HTML']
count the lowest index of ‘P’:
[ 0  0 -1  4 -1]

Pictorial Presentation:

NumPy String: Count the lowest index of

Python-Numpy Code Editor:

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

Previous: Write a NumPy program to count the number of "P" in a given array, element-wise.
Next: Write a NumPy program to check if each element of a given array is composed of digits only, lower case letters only and upper case letters only.

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