PythonDailyDrills

try and except

Handle an error instead of crashing. Code in try runs; if it raises the named error, except runs.

Syntax

try:
    ...
except ValueError:
    ...
  • Name the error you expect. A bare except hides real bugs.

Example

try:
    int("abc")
except ValueError:
    print("not a number")

Output:

not a number

Common mistakes

  • Catching everything with except: makes bugs invisible.
  • Keep the try block small, so you know which line failed.

Practise it