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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 Code Editor:

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Previous: Write a NumPy program to check whether each element of a given array starts with "P".
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Python: Tips of the Day

Returns the symmetric difference between two lists, after applying the provided function to each list element of both:

Example:

def tips_symmetric_difference_by(p, q, fn):
  _p, _q = set(map(fn, p)), set(map(fn, q))
  return [item for item in p if fn(item) not in _q] + [item for item in q if fn(item) not in _p]
from math import floor
print(tips_symmetric_difference_by([4.2, 2.4], [4.6, 6.8],floor))

Output:

[2.4, 6.8]