Skip to content
Related Articles

Related Articles

Improve Article

numpy string operations | lstrip() function

  • Last Updated : 17 Jan, 2019

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:



Input array :  ['Sun' ' Moon ' 'Star']
Output array:  ['Sun' 'Moon' 'Star']

 
Code #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']

 
Code #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']

 Attention geek! Strengthen your foundations with the Python Programming Foundation Course and learn the basics.  

To begin with, your interview preparations Enhance your Data Structures concepts with the Python DS Course. And to begin with your Machine Learning Journey, join the Machine Learning – Basic Level Course




My Personal Notes arrow_drop_up
Recommended Articles
Page :