A 'TypeError' in Python occurs when an operation is performed on an inappropriate data type. Check the types of your variables and ensure they are compatible for the operations being performed.

The 'TypeError' is a common exception in Python that arises when an operation or function receives an argument of an inappropriate type. This can happen for various reasons, such as trying to concatenate a string and an integer, or passing a list to a function that expects a string. To troubleshoot a TypeError, begin by carefully examining the error message, as it usually indicates which operation caused the exception and the types of the involved variables. Ensure that the types of your variables are compatible with the operation being performed; for instance, if you are performing arithmetic operations, verify that all operands are of numerical types. Python offers built-in functions like isinstance() to check the type of a variable, which can help you diagnose type-related issues. Additionally, consider using try-except blocks to handle TypeErrors gracefully, allowing your program to respond appropriately without crashing. By being mindful of variable types and employing proper error handling, you can effectively manage TypeErrors and enhance the robustness of your Python code.