Phlip a écrit :
On Jan 5, 8:49 pm, Steven D'Aprano
<ste...@remove.this.cybersource.com.au> wrote:
(A related question - why can't I just go 'if record = method(): use
(record)'. Why extra lines just to trap and assign the variable before
using it?)
Because that idiom is responsible for probably the most common error in C
of all, at least one of the most common errors. Thank goodness Python
forbids such a dangerous construct.
switching = for == is the "most common error in C"?
I can't tell if you are joking.
It's at least a _very_ common error in all languages that allow this
construct. In C, it's common enough to gave birth to the "BestPractice"
you described, ie swapping operand orders in equality test to have the
compiler detect the problem - at least when one of the operand is a
function call expression or constant (it obviously won't 'work' when
both operands are variables).
Anyway: in Python, assignment is not an expression, and this isn't going
to change anytime soon.
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