Return element-wise a copy of the string with uppercase characters converted to lowercase and vice versa in Numpy

To return element-wise a copy of the string with uppercase characters converted to lowercase and vice versa, use the numpy.char.swapcase() method in Python Numpy. For 8-bit strings, this method is locale-dependent.

The function swapcase() returns an output array of str or unicode, depending on input type. The numpy.char module provides a set of vectorized string operations for arrays of type numpy.str_ or numpy.bytes_.

Steps

At first, import the required library −

import numpy as np

Create a One-Dimensional array of strings −

arr = np.array(['Katie', 'JOHN', 'Kate', 'AmY', 'brADley'])

Displaying our array −

print("Array...<br>",arr)

Get the datatype −

print("\nArray datatype...<br>",arr.dtype)

Get the dimensions of the Array −

print("\nArray Dimensions...<br>",arr.ndim)

Get the shape of the Array −

print("\nOur Array Shape...<br>",arr.shape)

Get the number of elements of the Array −

print("\nElements in the Array...<br>",arr.size)

To return element-wise a copy of the string with uppercase characters converted to lowercase and vice versa, use the numpy.char.swapcase() method −

print("\nResult (swapcases)...<br>",np.char.swapcase(arr))

Example

import numpy as np

# Create a One-Dimensional array of strings
arr = np.array(['Katie', 'JOHN', 'Kate', 'AmY', 'brADley'])

# Displaying our array
print("Array...<br>",arr)

# Get the datatype
print("\nArray datatype...<br>",arr.dtype)

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

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

# Get the number of elements of the Array
print("\nNumber of elements in the Array...<br>",arr.size)

# To return element-wise a copy of the string with uppercase characters converted to lowercase and vice versa, use the numpy.char.swapcase() method in Python Numpy
print("\nResult (swapcases)...<br>",np.char.swapcase(arr))

Output

Array...
['Katie' 'JOHN' 'Kate' 'AmY' 'brADley']

Array datatype...
<U7

Array Dimensions...
1

Our Array Shape...
(5,)

Number of elements in the Array...
5

Result (swapcases)...
['kATIE' 'john' 'kATE' 'aMy' 'BRadLEY']