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

NumpyServer Side ProgrammingProgramming

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...\n",arr)

Get the datatype −

print("\nArray datatype...\n",arr.dtype)

Get the dimensions of the Array −

print("\nArray Dimensions...\n",arr.ndim)

Get the shape of the Array −

print("\nOur Array Shape...\n",arr.shape)

Get the number of elements of the Array −

print("\nElements in the Array...\n",arr.size)

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

print("\nResult...\n",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...\n",arr)

# Get the datatype
print("\nArray datatype...\n",arr.dtype)

# Get the dimensions of the Array
print("\nArray Dimensions...\n",arr.ndim)

# Get the shape of the Array
print("\nOur Array Shape...\n",arr.shape)

# Get the number of elements of the Array
print("\nNumber of elements in the Array...\n",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("\nResult...\n",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']
raja
Updated on 17-Feb-2022 11:45:34

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