在NumPy陣列中,為每個元素返回一個副本,其中去掉了前導字元
要返回一個去掉了前導字元的陣列副本,請使用Python NumPy中的**numpy.char.lstrip()**方法。"chars"引數用於設定一個字串,指定要刪除的字元集。如果省略或為None,則chars引數預設為刪除空格。chars引數不是字首;而是刪除其所有值的組合。
numpy.char模組提供了一組針對numpy.str_或numpy.bytes_型別陣列的向量化字串操作。
chars引數是一個字串,指定要刪除的字元集。如果省略或為None,則chars引數預設為刪除空格。chars引數不是字首;而是刪除其所有值的組合。
步驟
首先,匯入所需的庫:
import numpy as np
建立一個包含一些前導和尾隨字元的一維字串陣列:
arr = np.array(['zzzzTomzzzz', 'zzzJohn', 'zKate ', 'zAmyzz', 'zBradz'])
顯示我們的陣列:
print("Array...
",arr)獲取資料型別:
print("
Array datatype...
",arr.dtype)
獲取陣列的維度:
print("
Array Dimensions...
",arr.ndim)獲取陣列的形狀:
print("
Our Array Shape...
",arr.shape)獲取陣列的元素數量:
print("
Elements in the Array...
",arr.size)要返回一個去掉了前導字元的陣列副本,請使用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'))輸出
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']
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