call by value reference name

按名调用 Algol

按值调用 Java

https://docs.python.org/3.6/faq/programming.html#how-do-i-write-a-function-with-output-parameters-call-by-reference

# 0-
# By returning a tuple of the results
def func2(a, b):
    # a, b = 'new-value', b + 1
    a = 'new-value'
    b = b + 1

    return a, b

x, y = 'old-value', 99
x, y = func2(x, y)

# 1-
# By using global variables. This isn’t thread-safe, and is not recommended.

# 2-
# By passing a mutable (changeable in-place) object

def func1(a):
    a[0], a[1] = 'new-value', a[1] + 1

args = ['old-value', 99]
func1(args)

# 3-
# By passing in a dictionary that gets mutated

def func3(args):
    args['a'], args['b'] = 'new-value', args['b'] + 1

args_b = {'a': 'old-value', 'b': 99}
func3(args_b)

# 4-
# Or bundle up values in a class instance
class callByRef:
    def __init__(self, **args):
        for (key, value) in args.items():
            setattr(self, key, value)

def func4(args):
    args.a, args.b = 'new-value', args.b + 1

args_c = callByRef(a='old-value', b=99)
func4(args_c)