NumPy教程-NumPy字符串函数
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NumPy包含以下用于操作字符串数据类型数组的函数。
序号 | 函数 | 描述 |
---|---|---|
1 | add() | 用于连接相应的数组元素(字符串)。 |
2 | multiply() | 返回指定字符串的多个副本,例如,如果字符串'hello'乘以3,则返回字符串'hello hello'。 |
3 | center() | 返回字符串的副本,其中原始字符串在左右填充填充字符的指定数量后居中。 |
4 | capitalize() | 返回原始字符串的副本,其中原始字符串的第一个字母转换为大写。 |
5 | title() | 返回字符串的标题化版本,即字符串中的每个单词的第一个字母转换为大写。 |
6 | lower() | 返回字符串的副本,其中所有字母转换为小写。 |
7 | upper() | 返回字符串的副本,其中所有字母转换为大写。 |
9 | split() | 返回字符串中的单词列表。 |
9 | splitlines() | 返回字符串中的行列表,按行边界分隔。 |
10 | strip() | 返回删除了前导和尾随空格的字符串的副本。 |
11 | join() | 返回一个字符串,它是给定序列中所有字符串连接而成的。 |
12 | replace() | 返回一个副本,其中所有出现的特定子字符串都被指定的子字符串替换。 |
13 | decode() | 用于逐元素地使用指定的编解码器对指定字符串进行解码。 |
14 | encode() | 用于逐元素地对解码后的字符串进行编码。 |
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