NumPy: Add two zeros to the beginning of each element of a given array of string values
NumPy String: Exercise-19 with Solution
Write a NumPy program to add two zeros to the beginning of each element of a given array of string values.
Sample Solution:
Python Code:
import numpy as np
nums = np.array(['1.12', '2.23', '3.71', '4.23', '5.11'], dtype=np.str)
print("Original array:")
print(nums)
print("\nAdd two zeros to the beginning of each element of the said array:")
print(np.char.add('00', nums))
print("\nAlternate method:")
print(np.char.rjust(nums, 6, fillchar='0'))
Sample Output:
Original array: ['1.12' '2.23' '3.71' '4.23' '5.11'] Add two zeros to the beginning of each element of the said array: ['001.12' '002.23' '003.71' '004.23' '005.11'] Alternate method: ['001.12' '002.23' '003.71' '004.23' '005.11']
Python-Numpy Code Editor:
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Previous: Write a NumPy program to check whether each element of a given array starts with "P".
Next: Write a NumPy program to replace a specific character with another in a given array of string values.
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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
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