To check if a variable contains a value that is a string, use the isinstancebuilt-in function.
The isinstance function takes two arguments. The first is your variable. Thesecond is the type you want to check for.
Example
Here is an example of using isinstance:
>>> var = "a string">>> isinstance(var, str)TrueAlternative approach
You can also use the type built-in function to see if the type of yourvariable is str. For example:
>>> type(var)<type 'str'>>>> type(var) == strTrueSo you could write something like this:
if type(var) == str: print("it's a string!")Check if a string is a valid number
If you want to see if your variable can be converted to a number, refer tothis post.
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