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Python String isascii() Method

The Python string isascii() method is used to check whether all characters in a string are ASCII (American Standard Code for Information Interchange) characters. ASCII characters are those whose Unicode code points are in the range from 0 to 127.

When you call isascii() on a string, it returns True if all characters in the string are ASCII characters, and False otherwise. If the string is empty, the isascii() method returns True since there are no characters to check.

Following is the basic syntax of the Python String isascii() method −

string.isascii()

This method does not accept any parameters.

The method returns a boolean value "True" or "False". It returns True if all characters in the string are ASCII characters, and False otherwise.

In the following example, we are checking if all characters in the string "text" are ASCII characters using the isascii() method −

text = "Hello"
result = text.isascii()
print("The result is:",result)  

The output obtained is as follows −

The result is: True

Here, we check if all characters in an empty string are ASCII characters using the isascii() method −

text = ""
result = text.isascii()
print("The result is:",result)     

Following is the output of the above code −

The result is: True

In this example, we check if all the special characters such as "!", "@", "$" etc. in the string "text" are ASCII characters −

text = "!@#$%"
result = text.isascii()
print("The result is:",result)   

The result produced is as shown below −

The result is: True

Now, we are checking if unicode characters in the string "text" are ASCII characters −

text = "Hèllo"
result = text.isascii()
print("The result is:",result)

We get the output as shown below −

The result is: False

This example checks if all characters in the string "text" are ASCII characters. Although the string is represented using Unicode escape sequences, the characters represented by the escape sequences are ASCII characters, so the result obtained is True −

text = "\u0048\u0065\u006c\u006c\u006f"
result = text.isascii()
print("The result is:",result)

Following is the output of the above code −

The result is: True

boolean_string_methods.htm

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