The Python numpy string functions are to alter the given string as per your requirement. The numpy string functions are: add, multiply, capitalize, title, upper, lower, center, split, splitlines, strip, join, replace, encode, and decode. For instance, the numpy string upper function converts a string to uppercase. These examples helps you understand the Python numpy string functions.
Python numpy add
The python numpy add function used for string concatenation. In this example, we are using this numpy add function to add two strings
import numpy as np
print('Numpy String concatenation')
print(np.char.add(['Tutorial'], ['Gateway']))
This time we declared two different strings. Next, we used this numpy char add function
import numpy as np
fname = 'Suresh'
company = ' Tutorial Gateway'
print('Numpy String concatenation')
print(np.char.add([fname], [company]))
Here, we are concatenating a string variable and a string
import numpy as np
fname = 'Suresh'
print('Numpy String concatenation')
print(np.char.add([fname], [' Working at Tutorial Gateway']))
Python numpy multiply
The Python numpy multiply function used to multiply or repeat a given string for a specified number of times. In this example, p.char.multiply(‘hello ‘, 2) repeats hello string twice.
import numpy as np
print('---Numpy String multiply---')
print(np.char.multiply('hello ', 2))
print('-------')
fname = 'Numpy '
print(np.char.multiply(fname, 4))
print(np.char.multiply(fname, 6))
Python numpy capitalize
The Python numpy capitalize function used to capitalize or uppercase the first letter in a complete string.
import numpy as np
print('---Numpy String capitalize---')
print(np.char.capitalize('hello'))
print(np.char.capitalize('hello world'))
print('-------')
fname = 'numpy'
company = 'tutorial gateway'
print(np.char.capitalize(fname))
print(np.char.capitalize(company))
Python numpy title
The Python numpy title function is to convert the first letter of each word to uppercase
import numpy as np
print('---Numpy String title---')
print(np.char.title('hello'))
print(np.char.title('hello world'))
print(np.char.title('hi, how are you?'))
print('-------')
name = 'python'
company = 'tutorial gateway'
print(np.char.title(name))
print(np.char.title(company))
Python numpy upper
The Python numpy upper converts all the letters in a string to uppercase
import numpy as np
print('---Numpy String upper---')
print(np.char.upper('hello'))
print(np.char.upper('hello world'))
print(np.char.upper('hi, how are you?'))
print('\n---Uppercase example 2----')
name = 'python'
company = 'tutorial gateway'
print(np.char.upper(name))
print(np.char.upper(company))
Python numpy lower
This Python numpy lower converts all the characters in a string to lowercase
import numpy as np
print('---Numpy String lower---')
print(np.char.lower('HI, HOW DO YOU DO?'))
print(np.char.lower('HELLO WORLD'))
print(np.char.lower('WELCOME'))
print('\n---Lowercase example 2----')
name = 'PYTHON'
company = 'WELCOME TO TUTORIAL GATEWAY'
print(np.char.lower(name))
print(np.char.lower(company))
Python numpy center
The Python numpy center is for padding a string. The syntax of the Numpy center
np.char.center(‘string’, length, ‘char’)
If the given length is less than the original string length, then Python removes the extra characters from the original string (trim)
If length is greater than the original string length, then those extra spaces filled with the given character. As the name suggests, the original string in the center position.
import numpy as np
print('---Numpy String center---')
print(np.char.center('Hello', 11, '*'))
print(np.char.center('Welcome', 20, '#'))
print(np.char.center('Hello', 4, '*'))
print('\n---Numpy char center example----')
name = 'Python'
company = 'TutorialGateway'
print(np.char.center(name, 30, '@'))
print(np.char.center(company, 50, '$'))
print(np.char.center(company, 10, '$'))
Python Numpy strip
The Python Numpy strip removes empty spaces from Both the right and left sides of a given string.
import numpy as np
msg1 = ' Hello'
msg2 = 'Python '
msg3 = ' Hello World '
print('Original Message = ', msg1)
print('Strip Left = ', np.char.strip(msg1))
print('\nOriginal Message = ', msg2)
print('Strip Right = ', np.char.strip(msg2))
print('\Original Message = ', msg3)
print('Strip Left & Right = ', np.char.strip(msg3))
Python numpy split
The Python numpy split function splits the given string based on the specified separator
import numpy as np
print('---Numpy String split---')
print(np.char.split('Hello World', sep = ' '))
print(np.char.split('hi,how are you?', sep = ' '))
print(np.char.split('hi,Python,Program', sep = ','))
print('\n----Numpy char split---')
msg = 'Welcome to Tutorial Gateway'
print(np.char.split(msg, sep = ' '))
msg2 = '[email protected]@[email protected]@Gateway'
print(np.char.split(msg2, sep = '@'))
Python numpy splitlines
This Python numpy splitlines returns a list of lines in a given string. The numpy splitlines considers the line breaks \n and \r.
import numpy as np
msg = 'Hello\nWorld'
print(msg)
print('-- Numpy splitlines output----')
print(np.char.splitlines(msg))
print()
msg1 = 'Hi\rHow are you?'
print(msg1)
print('-- Numpy splitlines output----')
print(np.char.splitlines(msg1))
print()
msg2 = 'Hi\rHow are \nyou?'
print(msg2)
print('-- Numpy splitlines output----')
print(np.char.splitlines(msg2))
print('\n---Numpy String splitlines---')
print(np.char.splitlines('Hello\nWorld'))
Python numpy join
The Python numpy join function joins the specified character(first Argument) after each character in a given string.
import numpy as np
print('---Numpy String join---')
print(np.char.join(':', 'HMS'))
print(np.char.join('/', 'dmy'))
print(np.char.join('-', 'dmy'))
print(np.char.join(' ', 'HelloWorld'))
print('\n----Numpy char join---')
print(np.char.join(['-', ':'], ['dmy', 'mdy']))
print(np.char.join(['@', '$', ':'], ['Hi', 'Hello', 'HMS']))
Python numpy replace
The Python numpy replace function is used to replace the substring with a new string
np.char.replace(original_string, old_string, new_string)
The Numpy replace function searches for an old string in an original string. If it finds, the numpy replace function replace with new_string.
import numpy as np
print(np.char.replace('Hello', 'l', 'K'))
print(np.char.replace('tutorial', 't', 'M'))
print(np.char.replace('oh boy! welcome to you', 'o', 'X'))
print(np.char.replace('oh boy! welcome to you', 'o', 'SSh'))
It is another example of a numpy string replace function.
import numpy as np
msg1 = 'Hello World'
msg2 = 'xyz working in xyz position at xyz company'
print('Original Message = ', msg1)
print('Repalce l with T = ', np.char.replace(msg1, 'l', 'T'))
print('Repalce o with HMS = ', np.char.replace(msg1, 'o', 'HMS'))
print('\nOriginal Message = ', msg2)
print('Repalce o with T = ', np.char.replace(msg2, 'o', 'T'))
print('Repalce xyz with abc = ', np.char.replace(msg2, 'xyz', 'abc'))
Python numpy encode
The Python numpy encode used to encode the string using the specified encoder. Here, np.char.encode(‘Hello’, ‘cp500’) encode Hello string using cp500
import numpy as np
print('---Numpy String encode---')
print(np.char.encode('Hello', 'cp500'))
print(np.char.encode('Hello', 'utf_16'))
print(np.char.encode('How are You?', 'cp500'))
print(np.char.encode('Welcome again!', 'utf_16'))
print('\n---Numpy char encode----')
name = 'Python'
company = 'Tutorial Gateway'
print(np.char.encode(name, 'cp500'))
print(np.char.encode(name, 'utf_16'))
print(np.char.encode(name, 'utf_16_le'))
print(np.char.encode(company, 'cp500'))
print(np.char.encode(company, 'utf_16'))
print(np.char.encode(company, 'utf_16_be'))
Python numpy decode
The Python numpy decode used to decode the already encoded (numpy encode) string. Here, you have to specify the code that has to use for decoding a message. If you use the wrong code, then numpy decode function throws an error.
import numpy as np
print('---Numpy String decode---')
print(np.char.decode(b'\xc8\x85\x93\x93\x96', 'cp500'))
print('\n---Numpy char decode----')
name = b'\xd7\xa8\xa3\x88\x96\x95'
company = b'\xe3\xa4\xa3\x96\x99\x89\x81\[email protected]\xc7\x81\xa3\x85\xa6\x81\xa8'
print(np.char.decode(name, 'cp500'))
print(np.char.decode(company, 'cp500'))
print('\n---Numpy char decode----')
name = 'Python Numpy'
ecode = np.char.encode(name, 'cp500')
dcode = np.char.decode(ecode, 'cp500')
print('Original Message = ', name)
print('Encoded Message = ', ecode)
print('Decoded Message = ', dcode)
