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"""
Python introspection helpers.
"""
from types import CodeType as code, FunctionType as function
def copycode(template, changes):
names = [
"argcount", "nlocals", "stacksize", "flags", "code", "consts",
"names", "varnames", "filename", "name", "firstlineno", "lnotab",
"freevars", "cellvars"
]
if hasattr(code, "co_kwonlyargcount"):
names.insert(1, "kwonlyargcount")
if hasattr(code, "co_posonlyargcount"):
# PEP 570 added "positional only arguments"
names.insert(1, "posonlyargcount")
values = [
changes.get(name, getattr(template, "co_" + name))
for name in names
]
return code(*values)
def copyfunction(template, funcchanges, codechanges):
names = [
"globals", "name", "defaults", "closure",
]
values = [
funcchanges.get(name, getattr(template, "__" + name + "__"))
for name in names
]
return function(copycode(template.__code__, codechanges), *values)
def preserveName(f):
"""
Preserve the name of the given function on the decorated function.
"""
def decorator(decorated):
return copyfunction(decorated,
dict(name=f.__name__), dict(name=f.__name__))
return decorator