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#Functions are first-class citizens in Python: # They can be passed as arguments to other functions, # returned as values from other functions, and # assigned to variables and stored in data structures. »> def myfunc(a, b): ... return a + b ... »> funcs = [myfunc] »> funcs[0] <function myfunc at 0x107012230> »> funcs[0](2, 3) 5

# You can use Python's built-in "dis" # module to disassemble #functions and # inspect their CPython VM bytecode: »> def greet(name): ... return 'Hello, ' + name + '!' »> greet('Dan') 'Hello, Dan!' »> import dis »> dis.dis(greet) 2 0 LOAD_CONST 1 ('Hello, ') 2 LOAD_FAST 0 (name) 4 BINARY_ADD 6 LOAD_CONST 2 ('!') 8 BINARY_ADD 10 RETURN_VALUE

# Functions are first-class citizens in Python. # They can be passed as arguments to other functions, # returned as values from other #functions, and # assigned to variables and stored in data structures. »> def myfunc(a, b): ... return a + b ... »> funcs = [myfunc] »> funcs[0] <function myfunc at 0x107012230> »> funcs[0](2, 3) 5

https://docs.python.org/3/library/subprocess.html The #subprocess module allows you to spawn new #processes, connect to their input/output/error pipes, and obtain their return codes. This module intends to replace several older #modules and #functions. #python

https://docs.python.org/3/library/atexit.html The #atexit module defines #functions to #register and #unregister cleanup functions. Functions thus registered are automatically executed upon normal interpreter termination. atexit runs these functions in the reverse order in which they were registered; if you register A, B, and C, at #interpreter#termination time they will be run in the order C, B, A.

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