NumPy字符串函数使用示例

NumPy包含以下函数, 用于对dtype字符串数组进行操作。

numpy.char.add()方法示例

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

输出

Concatenating two string arrays:
['welcome to srcmini' '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("srcmini", 20, '*'))

输出

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

numpy.char.capitalize()方法示例

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

输出

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

numpy.char.title()方法示例

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

输出

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

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 srcmini"))

输出

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

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 srcmini"))

输出

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

numpy.char.split()方法示例

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

输出

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

numpy.char.splitlines()方法示例

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

输出

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

numpy.char.strip()方法示例

import numpy as np 
str = "     welcome to srcmini     "
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 srcmini     
Removing the leading and trailing whitespaces from the string
welcome to srcmini

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 srcmini"
print("Original String:", str)
print("Modified String:", end=" ")
print(np.char.replace(str, "Welcome to", "www."))

输出

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

numpy.char.encode()和decode()方法示例

import numpy as np
enstr = np.char.encode("welcome to srcmini", '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 srcmini