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In relation to general assignments, see Angell on Assignments, passim; 1 Hate & Wall. By an assignment of a right all the accessories which belong to it, will pass with it as, if the assignor of a bond had collateral security, or a lien on property, the collateral security and the lien will pass with the assignment of the bond. Currently, this feature is available only in statement form, making it unavailable in list comprehensions and other expression contexts.
During discussion of this PEP, the operator became informally known as "the walrus operator".
The construct's formal name is "Assignment Expressions" (as per the PEP title), but they may also be referred to as "Named Expressions" (e.g.
His conclusion: the current proposal would have allowed a modest but clear improvement in quite a few bits of code.
Another use of real code is to observe indirectly how much value programmers place on compactness.
Due to design constraints in the reference implementation (the symbol table analyser cannot easily detect when names are re-used between the leftmost comprehension iterable expression and the rest of the comprehension), named expressions are disallowed entirely as part of comprehension iterable expressions (the part after each "in", and before any subsequent "if" or "for" keyword): A further exception applies when an assignment expression occurs in a comprehension whose containing scope is a class scope.
If the rules above were to result in the target being assigned in that class's scope, the assignment expression is expressly invalid.There is one special case: an assignment expression occurring in a list, set or dict comprehension or in a generator expression (below collectively referred to as "comprehensions") binds the target in the containing scope, honoring a declaration for the target in that scope, if one exists. First, it allows us to conveniently capture a "witness" for an if any((comment := line).startswith('#') for line in lines): print("First comment:", comment) else: print("There are no comments") if all((nonblank := line).strip() == '' for line in lines): print("All lines are blank") else: print("First non-blank line:", nonblank) -target name appearing in any comprehension containing the assignment expression.For the purpose of this rule the containing scope of a nested comprehension is the scope that contains the outermost comprehension. The latter names are local to the comprehension in which they appear, so it would be contradictory for a contained use of the same name to refer to the scope containing the outermost comprehension instead.Guido van Rossum searched through a Dropbox code base and discovered some evidence that programmers value writing fewer lines over shorter lines.Case in point: Guido found several examples where a programmer repeated a subexpression, slowing down the program, in order to save one line of code, e.g.A transfer of rights in real property or Personal Property to another that gives the recipient—the transferee—the rights that the owner or holder of the property—the transferor—had prior to the transfer. An assignment of wages is the transfer of the right to collect wages from the wage earner to his or her creditor. code that was written without any thought of this PEP, as part of a useful application, however large or small.Tim Peters has been extremely helpful by going over his own personal code repository and picking examples of code he had written that (in his view) would have been if rewritten with (sparing) use of assignment expressions.Legal assignments of choses in action do not, as a rule, require to be by deed. In common parlance this word signifies the transfer of all kinds of property, real, personal, and mixed, and whether the same be in possession or in action; as, a general assignment. In the case of life and marine insurance policies, notice of assignment must be given to the company. In a more technical sense it Is usually applied to the transfer of a term for years; but it is more properly used to signify a transfer of some particular estate or interest in lands. The proper technical words of an assignment are, assign, transfer, and set over; but the words grant, bargain, and sell, or any other words which will show the intent of the parties to make a complete transfer, will amount to an assignment. A chose in action cannot be assigned at law, though it may be done in equity; but the assignee takes it subject to all the equity to which it was liable in the hands of the original party.