numpy string operations | lstrip() function
Last Updated :
17 Jan, 2019
Improve
numpy.core.defchararray.lstrip(arr, chars=None) is another function for doing string operations in numpy. It returns a copy with the leading characters removed for each element in arr.
Parameters: arr : array_like of str or unicode. char : [str or unicode, optional] the set of characters to be removed. If omitted or None, it removes whitespace. The chars argument is not a prefix or suffix; it is all combinations of its values which we want to strip. Returns : [ndarray] Output array of str or unicode, depending on input type.Code #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:
Code #2 :
Input array : ['Sun' ' Moon ' 'Star'] Output array: ['Sun' 'Moon' 'Star']
# 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:
Code #3 :
Input array : ['Geeks' 'For' 'Geeks'] Output array: ['eeks' 'For' 'eeks']
# 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']
