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Python numpy.char.capitalize() Method (With Examples)

By IncludeHelp Last updated : November 29, 2023

Python numpy.char.capitalize() Method

The capitalize() method is a built-in method of the char class in the numpy module, it is used to get the copy of a string with the first letter capitalized, element-wise. The method accepts a string or array of strings and returns an updated string where the first letter is in a capital case, if the first letter is not a character then no change in the string.

Module

The following module is required to use the capitalize() method:

import numpy as np

Syntax

The following is the syntax of the capitalize() method:

char.capitalize(arr)

Parameter(s)

The following are the parameter(s):

• arr: An array of strings.

Return Value

The return type of the capitalize() method is <class 'numpy.ndarray'>, it returns an updated array of strings with the first letter capitalized.

Example 1: Using with array of strings (one-word strings)

# Importing numpy module
import numpy as np

# Creating an array of strings
arr = ["hello,", "world!", "how", "are", "you?", "12good"]

# Printing the array
print("arr: ", arr)

# Using char.capitalize() method
result = np.char.capitalize(arr)

# Printing the result
print("\nThe result is:\n", result)
print("\nThe type of the result is:", type(result))

Output

The output of the above example is:

arr:  ['hello,', 'world!', 'how', 'are', 'you?', '12good']

The result is:
 ['Hello,' 'World!' 'How' 'Are' 'You?' '12good']

The type of the result is: <class 'numpy.ndarray'>

Example 2: Using with array of strings (strings having multiple words)

# Importing numpy module
import numpy as np

# Creating an array of strings
arr = ["hello world", "123 how are you?"]

# Printing the array
print("arr: ", arr)

# Using char.capitalize() method
result = np.char.capitalize(arr)

# Printing the result
print("\nThe result is:\n", result)
print("\nThe type of the result is:", type(result))

Output

The output of the above example is:

arr:  ['hello world', '123 how are you?']

The result is:
 ['Hello world' '123 how are you?']

The type of the result is: <class 'numpy.ndarray'>

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