numpy string operations | ljust() function (original) (raw)

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 :

import numpy as geek

in_arr = geek.array([ 'Numpy' , 'Python' , 'Pandas' ])

print ( "Input array : " , in_arr)

width = 8

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 :

import numpy as geek

in_arr = geek.array([ 'Numpy' , 'Python' , 'Pandas' ])

print ( "Input array : " , in_arr)

width = 8

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 :

import numpy as geek

in_arr = geek.array([ '1' , '11' , '111' ])

print ( "Input array : " , in_arr)

width = 5

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--']