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Q&A How can I provide additional information when raising an exception?

Suppose I have some code like: filename = "bad_dir" print(f"File not found: {filename}.") raise(FileNotFoundError) When the exception isn't caught, the stack trace is printed at the end of ...

2 answers  ·  posted 2y ago by mcp‭  ·  edited 10mo ago by Karl Knechtel‭

Question python exception
#3: Post edited by user avatar Karl Knechtel‭ · 2024-02-02T07:27:21Z (10 months ago)
Avoid unnecessarily heavy formatting; copyedit for improved flow and clarity
  • How to provide additional information when raising exception
  • How can I provide additional information when raising an exception?
  • # MWE
  • ```py
  • filename = "bad_dir"
  • print(f"File not found: {filename}.")
  • raise(FileNotFoundError)
  • ```
  • # Question
  • How do I raise an exception while adding additional information? In the
  • example above, the exception raised is printed at the bottom of the
  • stacktrace, and the print above it is printed at runtime and hard to
  • find in the terminal.
  • Is there a way to add a string to the raised
  • exception to provide additional information?
  • Suppose I have some code like:
  • ```py
  • filename = "bad_dir"
  • print(f"File not found: {filename}.")
  • raise(FileNotFoundError)
  • ```
  • When the exception isn't caught, the stack trace is printed at the end of the output, right as the program aborts. The `print`ed message could be far above this and is hard to find in the terminal and hard to associate with the exception.
  • How can I provide additional information in the exception, so that it can be seen immediately when the traceback is displayed?
#2: Post edited by user avatar mcp‭ · 2022-10-25T15:31:20Z (about 2 years ago)
Make question findable
  • # MWE
  • ```py
  • filename = "bad_dir"
  • print(f"File not found: {filename}.")
  • raise(FileNotFoundError)
  • ```
  • # Question
  • How do I raise an exception while adding additional information? In the
  • example above, the exception raised is printed at the bottom of the
  • stacktrace, and the print above it is printed at runtime and hard to
  • find in the terminal. Is there a way to add a string to the raised
  • exception to provide additional information?
  • # MWE
  • ```py
  • filename = "bad_dir"
  • print(f"File not found: {filename}.")
  • raise(FileNotFoundError)
  • ```
  • # Question
  • How do I raise an exception while adding additional information? In the
  • example above, the exception raised is printed at the bottom of the
  • stacktrace, and the print above it is printed at runtime and hard to
  • find in the terminal.
  • Is there a way to add a string to the raised
  • exception to provide additional information?
#1: Initial revision by user avatar mcp‭ · 2022-10-25T15:30:33Z (about 2 years ago)
How to provide additional information when raising exception
# MWE
```py
filename = "bad_dir"

print(f"File not found: {filename}.")
raise(FileNotFoundError)
```
# Question
How do I raise an exception while adding additional information? In the
example above, the exception raised is printed at the bottom of the
stacktrace, and the print above it is printed at runtime and hard to
find in the terminal. Is there a way to add a string to the raised
exception to provide additional information?