NumPy 字符串函数

NumPy包含以下用于字符串数据类型数组操作的函数。

numpy.char.add()方法示例

import numpy as np 
print("Concatenating two string arrays:")
print(np.char.add(['welcome','Hi'], [' to Javatpoint', ' read python'] ))

输出：

Concatenating two string arrays:
['welcome to Javatpoint' 'Hi read python']

numpy.char.multiply() 方法示例

import numpy as np 
print("Printing a string multiple times:")
print(np.char.multiply("hello ",3))

输出：

Printing a string multiple times:
hello hello hello 

numpy.char.center()方法示例

import numpy as np 
print("Padding the string through left and right with the fill char *");
#np.char.center(string, width, fillchar)
print(np.char.center("Javatpoint", 20, '*'))

输出：

Padding the string through left and right with the fill char *
*****Javatpoint*****

numpy.char.capitalize() 方法示例

import numpy as np 
print("Capitalizing the string using capitalize()...")
print(np.char.capitalize("welcome to javatpoint"))

输出：

Capitalizing the string using capitalize()...
Welcome to javatpoint

numpy.char.title()方法示例

import numpy as np 
print("Converting string into title cased version...")
print(np.char.title("welcome to javatpoint"))

输出：

Converting string into title cased version...
Welcome To Javatpoint

numpy.char.lower()方法示例

import numpy as np 
print("Converting all the characters of the string into lowercase...")
print(np.char.lower("WELCOME TO JAVATPOINT"))

输出:

Converting all the characters of the string into lowercase...
welcome to javatpoint

numpy.char.upper()方法示例

import numpy as np 
print("Converting all the characters of the string into uppercase...")
print(np.char.upper("Welcome To Javatpoint"))

输出：

Converting all the characters of the string into uppercase...
WELCOME TO JAVATPOINT

numpy.char.split()方法示例

import numpy as np 
print("Splitting the String word by word..")
print(np.char.split("Welcome To Javatpoint"),sep = " ")

输出:

Splitting the String word by word..
['Welcome', 'To', 'Javatpoint']

numpy.char.splitlines()方法示例

import numpy as np 
print("Splitting the String line by line..")
print(np.char.splitlines("Welcome\nTo\nJavatpoint"))

输出:

Splitting the String line by line..
['Welcome', 'To', 'Javatpoint']

numpy.char.strip() 方法示例

import numpy as np 
str = "     welcome to javatpoint     "
print("Original String:",str)
print("Removing the leading and trailing whitespaces from the string")
print(np.char.strip(str))

输出：

Original String:      welcome to javatpoint     
Removing the leading and trailing whitespaces from the string
welcome to javatpoint

numpy.char.join()方法示例

import numpy as np 
print(np.char.join(':','HM'))

输出：

H:M

numpy.char.replace()方法示例

import numpy as np
str = "Welcome to Javatpoint"
print("Original String:",str)
print("Modified String:",end=" ")
print(np.char.replace(str, "Welcome to","www."))

输出:

Original String: Welcome to Javatpoint
Modified String: www. Javatpoint

numpy.char.encode() 和 decode() 方法示例

import numpy as np
enstr = np.char.encode("welcome to javatpoint", 'cp500')
dstr =np.char.decode(enstr, 'cp500')
print(enstr)
print(dstr)

输出:

b'\xa6\x85\x93\x83\x96\x94\x85@\xa3\x96@\x91\x81\xa5\x81\xa3\x97\x96\x89\x95\xa3'
welcome to javatpoint