Python中的 numpy.defchararray.center()

numpy.core.defchararray.center(arr, width, fillchar)：将字符串的元素按元素居中。

Parameters: 
arr : array-like or string. 
width : Length of resulting string. 
fillchar : Padding character. Default is space.
Returns : Copy of array with centered string.

代码#1：

Python3

# Python Program illustrating
# numpy.char.center() method
import numpy as np
 
arr1 = ['eAAAa', 'ttttds', 'AAtAAt']
print ("arr1 : ", arr1)
 
print ("\narr1 : ", np.char.center(arr1, 7, fillchar ='z'))
print ("\narr1 : ", np.char.center(arr1, [9, 9, 11],
                         fillchar =['z', '1', '3']))
 
print ("\narr1 : ", np.char.center(arr1, 11, fillchar ='z'))

输出：

arr1 :  ['eAAAa', 'ttttds', 'AAtAAt']

 centered arr1 :  ['zeAAAaz' 'zttttds' 'zAAtAAt']

 centered arr1 :  ['zzeAAAazz' '11ttttds1' '333AAtAAt33']

 centered arr1 :  ['zzzeAAAazzz' 'zzzttttdszz' 'zzzAAtAAtzz']

代码#2：

Python3

# Python Program illustrating
# numpy.char.center() method
import numpy as np
 
arr2 = ['11sf', 'sdsf2', '1111f2']
print ("arr2 : ", arr2)
 
# Will throw Error
print ("\narr2 : ", np.char.center(arr2))

输出：

arr2 :  ['11sf', 'sdsf2', '1111f2']

TypeError: center() missing 1 required positional argument: 'width'