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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. 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.
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.
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.
During the development of this PEP many people (supporters and critics both) have had a tendency to focus on toy examples on the one hand, and on overly complex examples on the other.
The danger of toy examples is twofold: they are often too abstract to make anyone go "ooh, that's compelling", and they are easily refuted with "I would never write it that way anyway".
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.
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.