Python 3.10 — Better error messages
3 min readApr 12, 2022
Python 3.10.0 is the newest major release of the Python programming language, and it contains many new features and optimizations and today we will explore Better error messages feature.
Better error messages
SyntaxErrors
When parsing code that contains unclosed parentheses or brackets the interpreter now includes the location of the unclosed bracket of parentheses instead of displaying SyntaxError: unexpected EOF while parsing or pointing to some incorrect location. SyntaxError examples:
File "example.py", line 1
expected = {9: 1, 18: 2, 19: 2, 27: 3, 28: 3, 29: 3, 36: 4, 37: 4,
^
SyntaxError: '{' was never closedFile "example.py", line 1
expected = {9: 1, 18: 2, 19: 2, 27: 3, 28: 3, 29: 3, 36: 4, 37: 4,
^
SyntaxError: '{' was never closed>>> foo(x, z for z in range(10), t, w)
File "<stdin>", line 1
foo(x, z for z in range(10), t, w)
^^^^^^^^^^^^^^^^^^^^
SyntaxError: Generator expression must be parenthesized
And much more, like:
- Missing
:before blocks
