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Page 675 of 2109
How to catch LookupError Exception in Python?
LookupError in Python is the base class for errors that occur when a lookup using a key or index fails to find the expected value. This includes exceptions like IndexError and KeyError. If any lookup operation fails, a LookupError or one of its subclasses is raised. In this article, you will learn how to catch LookupError exceptions in Python and handle them to prevent your program from crashing abruptly. LookupError is commonly raised when − You access an invalid index in a list or a tuple. You use a ...
Read MoreHow to catch EnvironmentError Exception in Python?
In Python, the EnvironmentError occurs when errors related to the system's environment, such as file I/O issues or hardware failures, occur. In the latest Python versions (i.e., 3.3+), this exception is the same as OSError. In this article, you will learn how to catch EnvironmentError (or OSError) to handle system-level errors and prevent programs from crashing abruptly. Some of the common reasons to catch EnvironmentError are − When a file operation fails When a directory cannot be accessed or found When a hardware or device-related issue occurs Using try-except to Catch EnvironmentError To catch ...
Read MoreHow to catch TypeError Exception in Python?
A TypeError occurs in Python when we perform an operation on an object of an inappropriate type. For example, adding a string to an integer or calling a non-callable object. In this article, you will learn how to catch and handle TypeError exceptions using different methods in Python. TypeError is raised when you use the wrong data type in an operation. You can handle this exception using try-except blocks to prevent the program from crashing and help you correct input. Always test your code where type mismatches are possible, especially when working with user input or dynamic data. ...
Read MoreHow to catch IndentationError Exception in python?
Python uses indentation to define blocks of code instead of curly braces or keywords. If the indentation is not correct, Python raises an IndentationError. In this article, you will learn how to catch and handle IndentationError in Python using various approaches. An IndentationError in Python occurs when the indentation rules are not followed properly. It is raised during the parsing stage, not during execution. Therefore, to catch it, you must execute the code dynamically as a string. Using exec(), compile(), and custom wrapper functions, you can catch and handle this error in Python programs. Methods to Catch IndentationError ...
Read MoreHow to catch SyntaxError Exception in Python?
SyntaxError in Python occurs when the interpreter encounters invalid syntax, such as missing colons, unmatched parentheses, incorrect indentation, or invalid keywords. Since this error happens during the code compilation stage (before execution), it cannot be caught using a regular try-except block. To handle it, you must wrap the faulty code inside the exec() or compile() functions within a try-except block. Here, we are demonstrating the occurrence of SyntaxError and handling it using the following methods − exec() Method compile() Method Using a custom function with exception ...
Read MoreHow to catch EOFError Exception in Python?
EOFError is commonly seen when a program tries to read input, but there is no data left to read. This can happen when input is redirected from a file or when the user provides no input and presses Ctrl+D (Unix) or Ctrl+Z (Windows). The best way to catch EOFError is by using the try-except block. Below are various ways to handle EOFError properly in Python ? Using try-except block with EOFError Using try-except-else block Using try-except-finally block Using try-except Block with EOFError In Python, the ...
Read MoreHow to catch NameError Exception in Python?
Whenever Python comes across a variable or name that is not defined in the local or global namespace, it raises a NameError. This helps in debugging and ensures that variables are properly declared before using them. There are various ways to catch and handle a NameError in Python. The most common method is using a try-except block. Below are different approaches to catch a NameError exception − Using try-except block with NameError Using try-except-else block Using try-except-finally block Handling function calls before definition ...
Read MoreHow to catch IndexError Exception in Python?
In Python, an IndexError occurs when you try to access a position (index) in a list, tuple, or similar collection that doesn't exist. It means your program is trying to access elements that are not available in the sequence. Using try-except to Catch IndexError You can use a try-except block to catch an IndexError and prevent your program from crashing when accessing an invalid index ? my_list = [10, 20, 30] try: print(my_list[5]) except IndexError: print("IndexError caught: list index out of range.") IndexError caught: ...
Read MoreHow to catch OverflowError Exception in Python?
When an arithmetic operation exceeds the limits of the variable type, an OverflowError is raised. This commonly occurs with floating-point calculations that produce results too large for Python to represent. While integers in Python 3 have arbitrary precision, floating-point operations can still overflow. Using try-except to Catch OverflowError You can use a try-except block to catch an OverflowError and prevent your program from crashing when a calculation overflows ? Example: Catching an OverflowError In this example, we calculate a very large exponent which causes an OverflowError ? try: result = ...
Read MoreHow to catch ArithmeticError Exception in Python?
While executing statements that perform arithmetic operations, if any operation results in an illegal value, an arithmetic exception occurs at runtime. In Python, ArithmeticError represents this exception and serves as the base class for all errors that occur during arithmetic operations, such as division by zero, overflow, or floating-point errors. Basic Exception Handling with try-except You can use a try-except block to catch ArithmeticError and handle errors gracefully ? try: result = 10 / 0 except ArithmeticError: print("ArithmeticError caught: division by zero.") ArithmeticError caught: division ...
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