Python

# Python Check if a String is a Float

A string is any collection of characters that is surrounded by single or double-quotes marks and interpreted literally by a script. More specifically, a string that involves several lines is called a multiline string. The floating points are one of the most common built-in numeric data types having decimal points. Changing the integral value is quite easy. However, the transformation of the floating number is much more complicated.

This guide will provide a way to check if a string is float or not in Python.

## How to Check if a String is a Float in Python?

To check if a string is a float in Python, the below-listed methods are used:

## Method 1: Check if a String is a Float in Python Utilizing “float()” Method

To check if a Python string is a float or not, the “float()” is used. It can transform the provided string to a float number. Moreover, it can fail to represent that the specified string is not a valid number.

### Example

First, import the “numpy” library as an “np. Then, import the “matplotlib.pyplot” as a “plt” to manage some numeric values and manage graph:

import numpy as np

import matplotlib.pyplot as plt

Now, create a string variable and initialize with the floating number:

my_string = "0.9837"

Next, print the above-initialized string:

print("Original String : " + str(my_string))

Then, use the try-except block to check if the provided string is float or not. For this purpose, we have invoked the “float()” method and passed a string as an argument. After that, we created a variable which used to store the results. If a string is not a float number then it will print the specified message”

try:

float(my_string)

resultant_value = True

except:

print("Not a float")

resultant_value = False

print("Is input string is a float number? " + str(resultant_value))

The value “true” as output indicates that the provided string is a float value: ## Method 2: Check if a String is a Float in Python Utilizing “replace()” and “isdigit()” Methods

Another method to check if a string is a floating number or not in Python, the “replace()” and “isdigit()” method. The “replace()” method provides all instances of a substring by another. However, the “isdigit()” method is used to verify the data type of the variables.

### Example

Call the “replace()” method with the required arguments. Then, use the “isdigit()” method. To store the results, declare a “resultant_value” variable:

resultant_value = my_string.replace('.', '', 1).isdigit()

Use the “print()” built-in function to display the results of provided variable:

print("Is input string is a float number? " + str(resultant_value))

Output That’s all! You have learned different ways to check whether the provided string is a float in Python.

## Conclusion

To check if a string is float or not in Python, the “float()” method, the “replace()” method, and the “isdigit()” method can be used. All methods are Python’s built-in methods. In this guide, we have provided all possible ways to check if a string is float or not in Python. 