numpy string operations | ljust() function

Last Updated : 05 Feb, 2019

numpy.core.defchararray.ljust(arr, width, fillchar=' ') is another function for doing string operations in numpy. It returns an array with the elements of arr left-justified in a string of length width. It fills remaining space of each array element using fillchr parameter. If fillchr is not passed then it fills remaining spaces with blank space.

Parameters:
arr : array_like of str or unicode.Input array.
width : The final width of the each string .
fillchar : The character to fill in remaining space.

Returns : Output array of str or unicode, depending on input type.

Code #1 :

   # Python program explaining 
# numpy.char.ljust() method  
  
# importing numpy  
import numpy as geek 
  
# input array   
in_arr = geek.array(['Numpy', 'Python', 'Pandas']) 
print ("Input array : ", in_arr)  
  
# setting the width of each string to 8 
width = 8
  
# output array when fillchar is not passed 
out_arr = geek.char.ljust(in_arr, width) 
print ("Output left justified array: ", out_arr)  
 
  

Output:

  Input array :  ['Numpy' 'Python' 'Pandas']  Output left justified array:  ['Numpy   ' 'Python  ' 'Pandas  ']

Code #2 :

   # Python program explaining 
# numpy.char.ljust() method  
  
# importing numpy  
import numpy as geek 
  
# input array   
in_arr = geek.array(['Numpy', 'Python', 'Pandas']) 
print ("Input array : ", in_arr)  
  
# setting the width of each string to 8 
width = 8
  
# output array  
out_arr = geek.char.ljust(in_arr, width, fillchar ='*') 
print ("Output left justified array: ", out_arr)  
 
  

Output:

  Input array :  ['Numpy' 'Python' 'Pandas']  Output left justified array:  ['Numpy***' 'Python**' 'Pandas**']

Code #3 :

   # Python program explaining 
# numpy.char.ljust() method  
  
# importing numpy  
import numpy as geek 
  
# input array   
in_arr = geek.array(['1', '11', '111']) 
print ("Input array : ", in_arr) 
  
# setting the width of each string to 5 
width = 5
  
# output array 
out_arr = geek.char.ljust(in_arr, width, fillchar ='-') 
print ("Output left justified array: ", out_arr)  
 
  

Output:

  Input array :  ['1' '11' '111']  Output left justified array:  ['1----' '11---' '111--']

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