For each element in a Numpy array, return a copy with the leading characters removed in Numpy

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.

The numpy.char module provides a set of vectorized string operations for arrays of type numpy.str_ or numpy.bytes_.

The chars parameter is 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.

Steps

At first, import the required library −

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

To return a copy of an array with the leading characters removed, use the numpy.char.lstrip() method −

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

Example

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'))

Output

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']

Updated on: 17-Feb-2022

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