Tutorials

Python string isdecimal() Method

Posted in Python Tutorial

Updated on Jan 11, 2024

By Mari Selvan

👁️ 41 - Views

⏳ 4 mins

💬 1 Comment

Photo Credit to CodeToFun

🙋 Introduction

In Python, string manipulation is a fundamental aspect of programming.

The isdecimal() method is a built-in string method that allows you to check if a string contains only decimal characters.

In this tutorial, we'll explore the usage and functionality of the isdecimal() method in Python.

💡 Syntax

The syntax for the isdecimal() method is as follows:

Syntax

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string.isdecimal()

string: The string to be checked for decimal characters.

📄 Example 1

Let's dive into some examples to illustrate how the isdecimal() method works.

isdecimal.py

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num_str = "12345"
result1 = num_str.isdecimal()
print("Example 1:", result1)

💻 Testing the Program

Output

Example 1: True

🧠 How the Program Works

In Example 1, the isdecimal() method checks if the string "12345" contains only decimal characters, and the result is True.

📄 Example 2

Let's dive into another examples to illustrate how the isdecimal() method works.

isdecimal.py

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text_str = "Hello123"
result2 = text_str.isdecimal()
print("Example 2:", result2)

💻 Testing the Program

Output

Example 2: False

🧠 How the Program Works

In Example 2, the string "Hello123" contains non-decimal characters, so the result of isdecimal() is False.

↩️ Return Value

The isdecimal() method returns a boolean value:

True: if all characters in the string are decimal.
False: if the string contains at least one non-decimal character.

📚 Common Use Cases

The isdecimal() method is useful when you need to validate user input or verify that a string represents a decimal number before performing mathematical operations.

📝 Notes

The isdecimal() method only considers characters that are considered decimal digits in Unicode. This includes digits from various scripts, not just the ASCII digits 0-9.
The method returns False for strings containing digits with special meanings, such as superscript digits.

🎢 Optimization

The isdecimal() method is optimized for efficiency. However, keep in mind that it checks the entire string, so for very long strings, consider its performance impact.

🎉 Conclusion

The isdecimal() method in Python is a valuable tool for checking whether a string consists of only decimal characters. It provides a quick and straightforward way to validate and process numeric input.

Feel free to experiment with different strings to explore the behavior of the isdecimal() method further. Happy coding!