# e Learning

## Learn How to Check if a String Is a Number in Python 3

In this tutorial, we will learn how to check if a string is a number in the Python 3 programming language.

Python 3 has a built-in string function called `str.isnumeric()` which will check whether a string is numeric or not. However, the `str.isnumeric()` function will return `False` for floating-point numbers. To check if a string is a float, we can use a try-except statement.

### Python is string numeric

Python `str.isnumeric()` function will return `True` if the given string is numeric or return `False` otherwise.

#### Example 1

``print(str.isnumeric("10"))``

The Above python code will return `True` since “10” is a numeric value.

``True``

#### Example 2

``print(str.isnumeric("abc"))``

The Above python code will return `False`.

We can also use the `isnumeric()` function with a string variable as follows.

``````number = "100"
print(number.isnumeric())``````

To return `True`, the whole string has to be numbers only, or it will return `False`. For Example, the following code will return `False` since the variable number contains the letter “A”.

``````number = "100A"
print(number.isnumeric())``````

### Check if a string is a Float in Python 3

Python `str.isnumeric()` function will return `False` for the floating-point numbers. But we can write a simple function using the `try-except` statement to check whether a string is a floating-point number or not.

``````def is_number(string):
try:
float(string)
return True
except ValueError:
return False``````

As per the above python code, we created a new function called `is_number()`. The Function will simply try to convert the given string to a float. If the string can be converted to float, then the is_number function will return `True`.

#### Example

``````def is_number(string):
try:
float(string)
return True
except ValueError:
return False

print(is_number("10.5"))``````

The Above Python Code will return `True`.

### Summary

In this tutorial, we learned how to check if a string is a number in python programming.

• We used the python `str.isnumeric()` function to check whether a string is numeric or not.
• To check Floating point numbers, we wrote a simple python function called `is_number()`.