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numpy string operations | zfill() function
  • Last Updated : 28 Jan, 2019

numpy.core.defchararray.zfill(arr, width) is another function for doing string operations in numpy. For each element in the array it returns the numeric string left-filled with zeros.The number of left filled zeros happen according to the width.

Parameters:
arr : array_like of str or unicode.Input array.
width : [int] The final width of the string after filling zeros.

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

Code #1 :




# Python program explaining
# numpy.char.zfill() method 
  
# importing numpy 
import numpy as geek
  
# input array  
in_arr = geek.array(['Geeks', 'for', 'Geeks'])
print ("Input array : ", in_arr) 
  
# setting the width of each string to 8
width = 8
  
# output array
out_arr = geek.char.zfill(in_arr, width)
print ("Output array: ", out_arr) 
Output:



Input array :  ['Geeks' 'for' 'Geeks']
Output array:  ['000Geeks' '00000for' '000Geeks']

 
Code #2 :




# Python program explaining
# numpy.char.zfill() 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.zfill(in_arr, width)
print ("Output array: ", out_arr) 
Output:
Input array :  ['1' '11' '111']
Output array:  ['00001' '00011' '00111']

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