all Python 3Exceptionsexception

decimal.ConversionSyntax

module exceptions

An invalid string was given when creating a Decimal from a string.

Syntax

raise decimal.ConversionSyntax

Catching this class directly gets you nowhere: a malformed string makes decimal raise InvalidOperation, and ConversionSyntax is just the name of the underlying condition, not the object that reaches your except clause. Write except decimal.InvalidOperation instead. And if the InvalidOperation trap is disabled in the context, nothing is raised at all — you get a Decimal NaN back, and the failure has to be spotted via the context flags or an is_nan() check.

Examples

import decimal
try:
    raise decimal.ConversionSyntax
except decimal.ConversionSyntax as e:
    print(type(e).__name__)   # → ConversionSyntax

See also

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