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## Overview
The **`char.swapcase()` function** in NumPy returns a copy of a string or array, depending on the input whose uppercase characters are converted to lowercase and vice versa, element-wise. In simpler words, all the uppercase elements are converted to lowercase, while all the lowercase elements are converted to uppercase.
## Syntax
```
char.swapcase(a)
```
## Parameter value
The `char.swapcase()` function takes a single and mandatory parameter value, **`a`**, which represents the input array or the string.
## Return value
The `char.swapcase()` function returns an output array of strings or Unicodes, depending on the input type that is passed to the function.

## Code example

import numpy as np

# creating an array 
myarray = np.array(["THAT", "There", "ThESE", "they"])

# implementing the char.swapcase() function 
print(np.char.swapcase(myarray))

## Code explanation
We converted all the uppercase characters of each element of the input array called `myarray` to lowercase characters and vice versa, using the `char.swapcase()` function.

What is the numpy.char.swapcase() function in Python?

Converts uppercase characters to lowercase and vice versa in a string or array element-wise.