#     Copyright 2026, Kay Hayen, mailto:kay.hayen@gmail.com find license text at end of file


"""Playing around with constants only."""

# pylint: disable=invalid-name,redefined-outer-name

from __future__ import print_function

try:
    long
except NameError:
    long = int


def displayDict(d):
    result = "{"
    first = True
    for key, value in sorted(d.items()):
        if not first:
            result += ","

        result += "%s: %s" % (repr(key), repr(value))
        first = False
    result += "}"

    return result


print("A bunch of constants and their representation:")
for value in (0, 3, -4, 17, "hey", (0,), 0.0, -0.0):
    print(value, ":", repr(value))

print("Comparing constants, optimizable:")
print(1 == 0)

print("Representation of long constants:")
a = long(0)
print(repr(long(0)), repr(a) == "0L")

print("Identity of empty dictionary constants:")
print({} is {})

a = ({}, [])

a[0][1] = 2
a[1].append(3)

print("Mutable list and dict inside an immutable tuple:")
print(a)

print("Empty list and dict are hopefully unchanged:")
print(({}, []))


def argChanger(a):
    a[0][1] = 2
    a[1].append(3)

    return a


print("Mutable list and dict inside an immutable tuple as arguments:")
print(argChanger(({}, [])))

print("Empty list and dict are hopefully still unchanged:")
print(({}, []))

print("Set constants:")
print(set(["foo"]))


def mutableConstantChanger():
    a = ([1, 2], [3])

    print("Start out with value:")
    print(a)

    a[1].append(5)
    print("Changed to value:")
    print(a)

    d = {"l": [], "m": []}
    print("Start out with value:")
    print(d)

    d["l"].append(7)
    print("Changed to value:")
    print(d)

    spec = dict(qual=[], storage=set(), type=[], function=set(), q=1)
    spec["type"].insert(0, 2)
    spec["storage"].add(3)
    print("Dictionary created from dict built-in.")
    print(sorted(spec))


mutableConstantChanger()
print("Redo constant changes, to catch corruptions:")
mutableConstantChanger()


def defaultKeepsIdentity(arg="str_value"):
    print("Default constant values are still shared if immutable:", arg is "str_value")


defaultKeepsIdentity()


# Dictionary creation from call arguments.
def dd(**d):
    return d


def f():
    def one():
        print("one")

    def two():
        print("two")

    a = dd(qual=one(), storage=two(), type=[], function=[])
    print("f mutable", displayDict(a))
    a = dd(qual=1, storage=2, type=3, function=4)
    print("f immutable", displayDict(a))

    x = {"p": 7}
    a = dd(qual=[], storage=[], type=[], function=[], **x)
    print("f ext mutable", displayDict(a))
    x = {"p": 8}
    a = dd(qual=1, storage=2, type=3, function=4, **x)
    print("f ext immutable", displayDict(a))


f()

# Dictionary creation one after another
x = {}
x["function"] = []
x["type"] = []
x["storage"] = []
x["qual"] = []
print("Manual built dictionary:", x)
x = {}
x["function"] = 1
x["type"] = 2
x["storage"] = 3
x["qual"] = 4
print("Manual built dictionary:", x)

# Constants in the code must be created differently.
d = {"qual": [], "storage": [], "type2": [], "function": []}
print("Mutable values dictionary constant:", displayDict(d))
d = {"qual": 1, "storage": 2, "type2": 3, "function": 4}
print("Immutable values dictionary constant:", displayDict(d))

# Constants that might be difficult
min_signed_int = int(-(2 ** (8 * 8 - 1) - 1) - 1)
print("Small int:", min_signed_int, type(min_signed_int))
min_signed_int = int(-(2 ** (8 * 4 - 1) - 1) - 1)
print("Small int", min_signed_int, type(min_signed_int))

# Constants that might be difficult
min_signed_long = long(-(2 ** (8 * 8 - 1) - 1) - 1)
print("Small long", min_signed_long, type(min_signed_long))
min_signed_long = long(-(2 ** (8 * 4 - 1) - 1) - 1)
print("Small long", min_signed_long, type(min_signed_long))

try:
    type_prepare = type.__prepare__
except AttributeError:
    print("Python2 has no type.__prepare__")
else:
    print("Type prepare", type_prepare)

#     Python tests originally created or extracted from other peoples work. The
#     parts were too small to be protected.
#
#     Licensed under the Apache License, Version 2.0 (the "License");
#     you may not use this file except in compliance with the License.
#     You may obtain a copy of the License at
#
#        http://www.apache.org/licenses/LICENSE-2.0
#
#     Unless required by applicable law or agreed to in writing, software
#     distributed under the License is distributed on an "AS IS" BASIS,
#     WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
#     See the License for the specific language governing permissions and
#     limitations under the License.
