Numpy字符串操作 |开始（）函数

numpy.core.defchararray.startswith()函数返回一个布尔数组，该数组为 True，其中字符串元素以前缀开头，否则为 False。

Syntax : numpy.core.defchararray.startswith(arr, prefix, start = 0, end = None)

Parameters :

arr : [array-like of str or unicode]  Array-like of str.

prefix : [str] Input string.

start, end : [int, optional] With optional start, test beginning at that position. With optional end, stop comparing at that position.

Return : [ndarray] Return the array of booleans.

代码#1：

Python3

# Python program explaining 
# numpy.char.startswith() function 
  
# importing numpy as geek  
import numpy as geek 
  
arr = "GeeksforGeeks - A computer science portal"
prefix = 'Geeks'
  
gfg = geek.char.startswith(arr, prefix, start = 0, end = None)
    
print (gfg)

输出 ：

True

代码#2：

Python3

# Python program explaining 
# numpy.char.startswith() function 
  
# importing numpy as geek  
import numpy as geek 
  
arr = "GeeksforGeeks - A computer science portal"
prefix = 'None'
  
gfg = geek.char.startswith(arr, prefix, start = 0, end = None)
    
print (gfg)

输出 ：

False