numpy 字符串操作| lstrip()函数
原文:https://www . geesforgeks . org/numpy-string-operations-lstrip-function/
numpy.core.defchararray.lstrip(arr, chars=None)是 numpy 中做字符串运算的另一个函数。它为 arr 中的每个元素返回一个删除了前导字符的副本。
参数: arr : 类似字符串或 unicode 的数组。 字符:【字符串或 unicode，可选】要删除的字符集。如果省略或无，它将删除空白。chars 参数不是前缀或后缀；我们想要剥离的是它的所有价值组合。
根据输入类型，返回字符串或 unicode 的输出数组。
代码#1 :
# Python program explaining
# numpy.char.lstrip() method
import numpy as geek
# input arrays
in_arr = geek.array(['Sun', ' Moon ', 'Star'])
print ("Input array : ", in_arr)
out_arr = geek.char.lstrip(in_arr)
# whitespace removed from arr[1]
# as we have set chars = None
print ("Output array: ", out_arr)
Output:
Input array : ['Sun' ' Moon ' 'Star']
Output array: ['Sun' 'Moon' 'Star']
代码#2 :
# Python program explaining
# numpy.char.lstrip() method
import numpy as geek
# input arrays
in_arr = geek.array([ 'Geeks', 'For', 'Geeks'] )
print ("Input array : ", in_arr)
out_arr = geek.char.lstrip(in_arr, chars ='G')
# 'G' removed from arr[0] and arr[2]
# as we have set chars ='G'
print ("Output array: ", out_arr)
Output:
Input array : ['Geeks' 'For' 'Geeks']
Output array: ['eeks' 'For' 'eeks']
代码#3 :
# Python program explaining
# numpy.char.lstrip() method
import numpy as geek
# input arrays
in_arr = geek.array([ 'Geeks', 'For', 'Geeks'] )
print ("Input array : ", in_arr)
out_arr = geek.char.lstrip(in_arr, chars ='s')
print ("Output array: ", out_arr)
# Arrays remain unchanged as there are
# no strings which start with 's'
Output:
Input array : ['Geeks' 'For' 'Geeks']
Output array: ['Geeks' 'For' 'Geeks']
