|Python Language Reference Manual|
by Guido van Rossum and Fred L. Drake, Jr.
Paperback (6"x9"), 120 pages
RRP £12.95 ($19.95)
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4.1.1 Interaction with dynamic features
There are several cases where Python statements are illegal when used in conjunction with nested scopes that contain free variables.
If a variable is referenced in an enclosing scope, it is illegal to delete the name. An error will be reported at compile time.
If the wild card form of import---‘import *’---is used in a
function and the function contains or is a nested block with free
variables, the compiler will raise a
exec is used in a function and the function contains or
is a nested block with free variables, the compiler will raise a
SyntaxError unless the exec explicitly specifies the local
namespace for the
exec. (In other words, ‘exec obj’
would be illegal, but ‘exec obj in ns’ would be legal.)
functions and the
exec statement do not have access to the
full environment for resolving names. Names may be resolved in the
local and global namespaces of the caller. Free variables are not
resolved in the nearest enclosing namespace, but in the global
exec statement and the
execfile() functions have optional arguments to override
the global and local namespace. If only one namespace is specified,
it is used for both.
|ISBN 0954161785||Python Language Reference Manual||See the print edition|