在NumPy数组中,为每个元素返回一个副本,其中去掉了前导字符


要返回一个去掉了前导字符的数组副本,请使用Python NumPy中的**numpy.char.lstrip()**方法。"chars"参数用于设置一个字符串,指定要删除的字符集。如果省略或为None,则chars参数默认为删除空格。chars参数不是前缀;而是删除其所有值的组合。

numpy.char模块提供了一组针对numpy.str_或numpy.bytes_类型数组的矢量化字符串操作。

chars参数是一个字符串,指定要删除的字符集。如果省略或为None,则chars参数默认为删除空格。chars参数不是前缀;而是删除其所有值的组合。

步骤

首先,导入所需的库:

import numpy as np

创建一个包含一些前导和尾随字符的一维字符串数组:

arr = np.array(['zzzzTomzzzz', 'zzzJohn', 'zKate ', 'zAmyzz', 'zBradz'])

显示我们的数组:

print("Array...
",arr)

获取数据类型:

print("
Array datatype...
",arr.dtype)

获取数组的维度:

print("
Array Dimensions...
",arr.ndim)

获取数组的形状:

print("
Our Array Shape...
",arr.shape)

获取数组的元素数量:

print("
Elements in the Array...
",arr.size)

要返回一个去掉了前导字符的数组副本,请使用numpy.char.lstrip()方法:

print("
Result...
",np.char.lstrip(arr, 'z'))

示例

import numpy as np

# Create a One-Dimensional array of string with some leading and trailing characters
arr = np.array(['zzzzTomzzzz', 'zzzJohn', 'zKate ', 'zAmyzz', 'zBradz'])

# Displaying our array
print("Array...
",arr) # Get the datatype print("
Array datatype...
",arr.dtype) # Get the dimensions of the Array print("
Array Dimensions...
",arr.ndim) # Get the shape of the Array print("
Our Array Shape...
",arr.shape) # Get the number of elements of the Array print("
Number of elements in the Array...
",arr.size) # To return a copy of an array with the leading characters removed, use the numpy.char.lstrip() method in Python Numpy # The "chars" parameter is used to set a string specifying the set of characters to be removed. # If omitted or None, the chars argument defaults to removing whitespace. # The chars argument is not a prefix; rather, all combinations of its values are stripped. print("
Result...
",np.char.lstrip(arr, 'z'))

输出

Array...
['zzzzTomzzzz' 'zzzJohn' 'zKate ' 'zAmyzz' 'zBradz']

Array datatype...
<U11

Array Dimensions...
1

Our Array Shape...
(5,)

Number of elements in the Array...
5

Result...
['Tomzzzz' 'John' 'Kate ' 'Amyzz' 'Bradz']

更新于:2022年2月17日

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