How Can I Efficiently Check if a String Represents a Number in Python?

Checking for Numeric Strings in Python

Determining whether a string represents a numeric value in Python can be a common requirement. While using float(s) within a try-except block may seem straightforward, this approach can appear cumbersome. Here are some alternative and more concise options:

Using isdigit()

For non-negative (unsigned) integers, the isdigit() method is a simple and efficient way to check for numeric strings. It returns True if the string contains only digits and False otherwise.

>>> a = "03523"
>>> a.isdigit()
True
>>> b = "963spam"
>>> b.isdigit()
False

For Python 2 Unicode strings, the isnumeric() method can be used instead.

Documentation

• isdigit(): Python2, Python3
• isnumeric(): Python2 Unicode strings

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