Determine if Python variable is an instance of a built-in type

Determine if Python variable is an instance of a built-in type

To determine if a Python variable is an instance of a built-in type, you can use the isinstance() function. The isinstance() function checks if an object is an instance of a specified class or a tuple of classes, which allows you to check if a variable belongs to a built-in type. Here's how you can use it:

# Check if a variable is an instance of a built-in type # Example variables var1 = 42 var2 = "Hello" var3 = [1, 2, 3] var4 = {"name": "Alice", "age": 30} # Check if var1 is an instance of an integer (int) if isinstance(var1, int): print("var1 is an instance of int") # Check if var2 is an instance of a string (str) if isinstance(var2, str): print("var2 is an instance of str") # Check if var3 is an instance of a list (list) if isinstance(var3, list): print("var3 is an instance of list") # Check if var4 is an instance of a dictionary (dict) if isinstance(var4, dict): print("var4 is an instance of dict")

In this example:

  • We have four example variables (var1, var2, var3, and var4) of different types.

  • We use the isinstance() function to check if each variable is an instance of a specific built-in type (e.g., int, str, list, or dict).

  • If the check is successful, a corresponding message is printed.

By using isinstance(), you can easily determine if a variable belongs to a specific built-in type or a combination of types by passing a tuple of classes as the second argument. For example, to check if a variable is either an integer or a float, you can do:

if isinstance(variable, (int, float)): print("variable is either an int or a float")

Examples

  1. How to check if a Python variable is a string?

    • Description: This query seeks a way to determine if a Python variable belongs to the string data type.
    def is_string(variable): return isinstance(variable, str) # Example usage: my_var = "Hello" print(is_string(my_var)) # Output: True

  2. Check if Python variable is a list

    • Description: This query is interested in verifying whether a Python variable is of type list.
    def is_list(variable): return isinstance(variable, list) # Example usage: my_var = [1, 2, 3] print(is_list(my_var)) # Output: True

  3. Verify if Python variable is an integer

    • Description: This query aims to determine if a given Python variable is of integer type.
    def is_integer(variable): return isinstance(variable, int) # Example usage: my_var = 42 print(is_integer(my_var)) # Output: True

  4. How to check if Python variable is a dictionary?

    • Description: This query looks for a method to ascertain if a Python variable is a dictionary.
    def is_dict(variable): return isinstance(variable, dict) # Example usage: my_var = {'key': 'value'} print(is_dict(my_var)) # Output: True

  5. Determine if Python variable is a float

    • Description: This query seeks a way to determine if a Python variable is of type float.
    def is_float(variable): return isinstance(variable, float) # Example usage: my_var = 3.14 print(is_float(my_var)) # Output: True

  6. Check if Python variable is a boolean

    • Description: This query focuses on checking whether a Python variable is a boolean value.
    def is_boolean(variable): return isinstance(variable, bool) # Example usage: my_var = True print(is_boolean(my_var)) # Output: True

  7. Verify if Python variable is a tuple

    • Description: This query aims to verify whether a Python variable is a tuple.
    def is_tuple(variable): return isinstance(variable, tuple) # Example usage: my_var = (1, 2, 3) print(is_tuple(my_var)) # Output: True

  8. How to determine if Python variable is a set?

    • Description: This query seeks a method to determine if a Python variable is a set.
    def is_set(variable): return isinstance(variable, set) # Example usage: my_var = {1, 2, 3} print(is_set(my_var)) # Output: True

  9. Check if Python variable is a bytes object

    • Description: This query is interested in checking if a Python variable is of type bytes.
    def is_bytes(variable): return isinstance(variable, bytes) # Example usage: my_var = b'Hello' print(is_bytes(my_var)) # Output: True

  10. How to determine if Python variable is a complex number?

    • Description: This query seeks a method to determine if a Python variable is a complex number.
    def is_complex(variable): return isinstance(variable, complex) # Example usage: my_var = 3 + 4j print(is_complex(my_var)) # Output: True

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