During discussion of this PEP, the operator became informally known as "the walrus operator".
For example, For the comprehension body (the part before the first "for" keyword) and the filter expression (the part after "if" and before any nested "for"), this restriction applies solely to target names that are also used as iteration variables in the comprehension.
Lambda expressions appearing in these positions introduce a new explicit function scope, and hence may use assignment expressions with no additional restrictions.
An assignee is clothed with the right of his principal.
See also: activity, agency, alienation, allotment, appointment, apportionment, arrogation, assignation, attribution, blame, burden, cession, charge, choice, citation, classification, commitment, consignment, conveyance, deed, department, deputation, designation, devolution, dispensation, disposition, distribution, duty, employment, function, job, labor, mission, nomination, obligation, occupation, position, project, province, quota, ration, reference, responsibility, role, selection, specification, trade, work 1 the transfer of property, especially terms of leases, CHATTELS personal and CHOSE IN ACTION. Legal assignments of terms of years must be by deed (even where the creation of the right assigned did not require a deed, as, for example, in the case of a lease of not more than three years); equitable assignments need not be by deed but must usually be in writing.
Statutes regulate the extent to which an assignment may be made.n. The deed by which an assignment is made,, is also called an assignment.
the act of transferring an interest in property or a some right (such as contract benefits) to another. Currently, this feature is available only in statement form, making it unavailable in list comprehensions and other expression contexts.Additionally, naming sub-parts of a large expression can assist an interactive debugger, providing useful display hooks and partial results.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. 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.the CPython reference implementation uses that name internally).Naming the result of an expression is an important part of programming, allowing a descriptive name to be used in place of a longer expression, and permitting reuse. 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.