n Python, a
NameError and a
ValueError are both types of exceptions that can occur during the execution of a program.
- NameError: A
NameErroris raised when you try to access a variable or use a name that is not defined in the current scope. It typically occurs when the interpreter cannot find the name you are referring to. This can happen if you mistype a variable name, use a variable before it is defined, or if the variable is defined in a different scope.
Example of a
print(x) # 'x' is not definedCode language: Python (python)
- ValueError: A
ValueErroris raised when a function receives an argument of the correct type but an inappropriate value. It typically occurs when you pass an argument to a function that the function doesn’t expect or handle properly. For example, if you provide a string to a function that expects an integer, a
ValueErrormay be raised.
Example of a
int("abc") # Cannot convert "abc" to an integerCode language: Python (python)
In this example, the
int() function expects a string that represents a valid integer. However, since “abc” is not a valid integer, a
ValueError is raised.
ValueError are common exceptions in Python, and they can be caught and handled using try-except blocks to gracefully handle errors in your code.
What is name error in Python using try except?
In Python, you can catch and handle a
NameError using a try-except block. The try-except block allows you to handle exceptions gracefully by providing alternative code to execute when an exception occurs.
Here’s an example of how to catch and handle a
NameError using try-except:
print(x) # Trying to access an undefined variable 'x'
print("Variable 'x' is not defined.")Code language: Python (python)
In this example, the code inside the try block attempts to print the value of the variable
x. However, if
x is not defined, a
NameError will be raised. To handle this error, we use the except block with the
NameError as the exception type.
NameError occurs, the code inside the except block will be executed, which in this case prints a custom error message indicating that the variable
'x' is not defined.
By using try-except blocks, you can catch specific exceptions, like
NameError, and provide appropriate actions or error messages to handle exceptional situations in your code.
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