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NumPy: String Exercises, Practice, Solution

NumPy String [22 exercises with solution]

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NumPy: String

1. Write a NumPy program to concatenate element-wise two arrays of string. Go to the editor
Expected Output:
Array1:
['Python' 'PHP']
Array2:
[' Java' ' C++']
new array:
['Python Java' 'PHP C++']
Click me to see the sample solution

2. Write a NumPy program to repeat all the elements three times of a given array of string Go to the editor
Expected Output:
Original Array:
['Python' 'PHP' 'Java' 'C++']
New array:
['PythonPythonPython' 'PHPPHPPHP' 'JavaJavaJava' 'C++C++C++']
Click me to see the sample solution

3. Write a NumPy program to capitalize the first letter, lowercase, uppercase, swapcase, title-case of all the elements of a given array. Go to the editor
Expected Output:
Original Array:
['python' 'PHP' 'java' 'C++']
Capitalized: ['Python' 'Php' 'Java' 'C++']
Lowered: ['python' 'php' 'java' 'c++']
Uppered: ['PYTHON' 'PHP' 'JAVA' 'C++']
Swapcased: ['PYTHON' 'php' 'JAVA' 'c++']
Titlecased: ['Python' 'Php' 'Java' 'C++']
Click me to see the sample solution

4. Write a NumPy program to make the length of each element 15 of a given array and the string centered / left-justified / right-justified with paddings of _. Go to the editor
Original Array:
['python exercises' 'PHP' 'java' 'C++']
Centered = ['python exercise' '______PHP______' '______java_____' '______C++______'] Left = ['python exercise' 'PHP____________' 'java___________' 'C++____________'] Right = ['python exercise' '____________PHP' '___________java' '____________C++']
Click me to see the sample solution

5. Write a NumPy program to insert a space between characters of all the elements of a given array. Go to the editor
Note: First array elements raised to powers from second array
Expected Output:
Original Array:
['python exercises' 'PHP' 'java' 'C++']
['p y t h o n e x e r c i s e s' 'P H P' 'j a v a' 'C + +']
Click me to see the sample solution

6. Write a NumPy program to encode all the elements of a given array in cp500 and decode it again. Go to the editor
Sample Output:
encoded = [b'\x97\xa8\xa3\x88\x96\[email protected]\x85\xa7\x85\x99\x83\x89\xa2\x85\xa2'
b'\xd7\xc8\xd7' b'\x91\x81\xa5\x81' b'\xc3NN']
decoded = ['python exercises' 'PHP' 'java' 'C++']
Click me to see the sample solution

7. Write a NumPy program to remove the leading and trailing whitespaces of all the elements of a given array. Go to the editor
Sample output:
Original array:
[ -10.2 122.2 0.2]
Element-wise absolute value:
[ 10.2 122.2 0.2]
Click me to see the sample solution

8. Write a NumPy program to remove the leading whitespaces of all the elements of a given array. Go to the editor
Sample Output:
Original Array:
[' python exercises ' ' PHP ' ' java ' ' C++']
Remove the leading whitespaces : ['python exercises ' 'PHP ' 'java ' 'C++']
Click me to see the sample solution

9. Write a NumPy program to remove the trailing whitespaces of all the elements of a given array. Go to the editor
Sample Output:
Original Array:
[' python exercises ' ' PHP ' ' java ' ' C++']
Remove the trailing whitespaces : [' python exercises' ' PHP' ' java' ' C++']
Click me to see the sample solution

10. Write a NumPy program to split the element of a given array with spaces. Go to the editor
Sample Output:
Original Array:
['Python PHP Java C++']
Split the element of the said array with spaces:
[list(['Python', 'PHP', 'Java', 'C++'])]
Click me to see the sample solution

11. Write a NumPy program to split the element of a given array to multiple lines. Go to the editor
Sample output:
Original Array:
['Python\\Exercises, Practice, Solution']
[list(['Python\\Exercises, Practice, Solution'])]
Click me to see the sample solution

12. Write a NumPy program to make all the elements of a given string to a numeric string of 5 digits with zeros on its left. Go to the editor
Sample output:
Original Array:
['2' '11' '234' '1234' '12345']
Numeric string of 5 digits with zeros:
['00002' '00011' '00234' '01234' '12345']
Click me to see the sample solution

13. Write a NumPy program to replace "PHP" with "Python" in the element of a given array. Go to the editor
Sample Output:
Original Array:
['PHP Exercises, Practice, Solution']
New array:
['Python Exercises, Practice, Solution']
Click me to see the sample solution

14. Write a NumPy program to test equal, not equal, greater equal, greater and less test of all the elements of two given arrays. Go to the editor
Expected Output:
Array1:
['Hello' 'PHP' 'JS' 'examples' 'html']
Array2:
['Hello' 'php' 'Java' 'examples' 'html']
Equal test:
[ True False False True True]
Not equal test:
[False True True False False]
Less equal test:
[ True True True True True]
Greater equal test:
[ True False False True True]
Less test:
[False True True False False]
Click me to see the sample solution

15. Write a NumPy program to count the number of "P" in a given array, element-wise. Go to the editor
Sample Output:
Original Array:
['Python' 'PHP' 'JS' 'examples' 'html']
Number of 'P':
[1 2 0 0 0]
Click me to see the sample solution

16. Write a NumPy program to count the lowest index of "P" in a given array, element-wise. Go to the editor
Original Array:
['Python' 'PHP' 'JS' 'EXAMPLES' 'HTML']
count the lowest index of 'P':
[ 0 0 -1 4 -1]
Click me to see the sample solution

17. Write a NumPy program to check whether each element of a given array is composed of digits only, lower case letters only and upper case letters only. Go to the editor
Sample output:
Original Array:
['Python' 'PHP' 'JS' 'Examples' 'html5' '5']
Digits only = [False False False False False True]
Lower cases only = [False False False False True False]
Upper cases only = [False True True False False False]
Click me to see the sample solution

18. Write a NumPy program to check whether each element of a given array starts with "P". Go to the editor
Sample output:
Original Array:
['Python' 'PHP' 'JS' 'examples' 'html']
Test if each element of the said array starts with 'P':
[ True True False False False]
Click me to see the sample solution

19. Write a NumPy program to add two zeros to the beginning of each element of a given array of string values. Go to the editor
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']
Click me to see the sample solution

20. Write a NumPy program to replace a specific character with another in a given array of string values. Go to the editor
Sample output:
Original array of string values:
[['Python-NumPy-Exercises']
['-Python-']]
Replace '-' with '=' character in the said array of string values:
[['Python==NumPy==Exercises']
['==Python==']]
Replace '-' with ' ' character in the said array of string values:
[['Python NumPy Exercises']
['Python']]
Click me to see the sample solution

21. Write a NumPy program to count a given word in each row of a given array of string values. Go to the editor
Sample output:
Original array of string values:
[['Python' 'NumPy' 'Exercises']
['Python' 'Pandas' 'Exercises']
['Python' 'Machine learning' 'Python']]
Count 'Python' row wise in the above array of string values:
[[1 0 0]
[1 0 0]
[1 0 1]]
Click me to see the sample solution

22. Write a NumPy program to split a given text into lines and split the single line into array values. Go to the editor
Sample output:
Original text:
01 V Debby Pramod
02 V Artemiy Ellie
03 V Baptist Kamal
04 V Lavanya Davide
05 V Fulton Antwan
06 V Euanthe Sandeep
07 V Endzela Sanda
08 V Victoire Waman
09 V Briar Nur
10 V Rose Lykos
Array from the said text:
[['01' 'V' 'Debby Pramod']
['02' 'V' 'Artemiy Ellie']
['03' 'V' 'Baptist Kamal']
['04' 'V' 'Lavanya Davide']
['05' 'V' 'Fulton Antwan']
['06' 'V' 'Euanthe Sandeep']
['07' 'V' 'Endzela Sanda']
['08' 'V' 'Victoire Waman']
['09' 'V' 'Briar Nur']
['10' 'V' 'Rose Lykos']]
Click me to see the sample solution

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Python: Tips of the Day

Getting rid of unwanted characters:

You can get rid of whitespaces or any specific character using strip methods in Python. You can use either plain strip for both sides, lstrip for the left side and rstrip for the right side only.

str="+++Welcome python+++"
str.strip()

print(str)

Output:

+++Welcome python+++