satisfactory clock | Python Fiddle

import json

class SegmentWriter:
    segment_length = 6
    item_template = """ {{ "resourceName": "{}", "levelName": "", "pathName": "", "position": 1}}"""
    def __init__(self, name, path, save_json):
        self.name = name
        self.path = path
        self.element = None
        for actor in save_json["actors"]:
            if actor["pathName"] == self.path:
                self.element = actor
                break

def write(self, item, times=1):
        item_templates = [json.loads(self.item_template.format(item)) for i in range(self.segment_length * times)]
        self.element["entity"]["extra"]["items"].extend(item_templates)

class NumberWriter:
    segment_names = ["a","b","c","d","e","f","g"]
    # the number 0 is the 0th element and so on
    # each element is a bitstring of len(segment_names)
    # 1 means lit and 0 means off
    # most -> least significant is g -> a
    segment_lighting = [0x3F, 0x06, 0x5B, 0x4F, 0x66, 0x6D, 0x7D, 0x07, 0x7F, 0x6F]
    """
    conveyor_names is a mapping of segment names (a,b,c,d,e,f, g)
        to conveyor path names
   """
    def __init__(self, conveyor_names, save_json, on_item="", off_item=""):
        self.on_item = on_item
        self.off_item = off_item
        self.segments_by_name = {}
        for segment_name in self.segment_names:
            self.segments_by_name[segment_name] = SegmentWriter(segment_name, conveyor_names[segment_name], save_json)

def write_number(self, number, times=1):
        for i, segment_name in enumerate(self.segment_names):
            segment = self.segments_by_name[segment_name]
            is_segment_lit = bool((0x01 << i) & self.segment_lighting[number])
            if is_segment_lit:
                segment.write(self.on_item, times)
            else:
                segment.write(self.off_item, times)

def write_off(self, times=1):
        for segment_name in self.segment_names:
            self.segments_by_name[segment_name].write(self.off_item, times)

h_tens_conveyor_names = {
    "a" : "Persistent_Level:PersistentLevel.Build_ConveyorBeltMk1_C_444",
    "b" : "Persistent_Level:PersistentLevel.Build_ConveyorBeltMk1_C_431",
    "c" : "Persistent_Level:PersistentLevel.Build_ConveyorBeltMk1_C_437",
    "d" : "Persistent_Level:PersistentLevel.Build_ConveyorBeltMk1_C_448",
    "e" : "Persistent_Level:PersistentLevel.Build_ConveyorBeltMk1_C_435",
    "f" : "Persistent_Level:PersistentLevel.Build_ConveyorBeltMk1_C_427",
    "g" : "Persistent_Level:PersistentLevel.Build_ConveyorBeltMk1_C_441"
    }
h_ones_conveyor_names = {
    "a" : "Persistent_Level:PersistentLevel.Build_ConveyorBeltMk1_C_508",
    "b" : "Persistent_Level:PersistentLevel.Build_ConveyorBeltMk1_C_495",
    "c" : "Persistent_Level:PersistentLevel.Build_ConveyorBeltMk1_C_501",
    "d" : "Persistent_Level:PersistentLevel.Build_ConveyorBeltMk1_C_512",
    "e" : "Persistent_Level:PersistentLevel.Build_ConveyorBeltMk1_C_499",
    "f" : "Persistent_Level:PersistentLevel.Build_ConveyorBeltMk1_C_491",
    "g" : "Persistent_Level:PersistentLevel.Build_ConveyorBeltMk1_C_505"
    }
m_tens_conveyor_names = {
    "a" : "Persistent_Level:PersistentLevel.Build_ConveyorBeltMk1_C_572",
    "b" : "Persistent_Level:PersistentLevel.Build_ConveyorBeltMk1_C_559",
    "c" : "Persistent_Level:PersistentLevel.Build_ConveyorBeltMk1_C_565",
    "d" : "Persistent_Level:PersistentLevel.Build_ConveyorBeltMk1_C_576",
    "e" : "Persistent_Level:PersistentLevel.Build_ConveyorBeltMk1_C_563",
    "f" : "Persistent_Level:PersistentLevel.Build_ConveyorBeltMk1_C_555",
    "g" : "Persistent_Level:PersistentLevel.Build_ConveyorBeltMk1_C_569"
    }
m_ones_conveyor_names = {
    "a" : "Persistent_Level:PersistentLevel.Build_ConveyorBeltMk1_C_636",
    "b" : "Persistent_Level:PersistentLevel.Build_ConveyorBeltMk1_C_623",
    "c" : "Persistent_Level:PersistentLevel.Build_ConveyorBeltMk1_C_629",
    "d" : "Persistent_Level:PersistentLevel.Build_ConveyorBeltMk1_C_640",
    "e" : "Persistent_Level:PersistentLevel.Build_ConveyorBeltMk1_C_627",
    "f" : "Persistent_Level:PersistentLevel.Build_ConveyorBeltMk1_C_619",
    "g" : "Persistent_Level:PersistentLevel.Build_ConveyorBeltMk1_C_633"
    }
lower_dot = "Persistent_Level:PersistentLevel.Build_ConveyorBeltMk1_C_404"
upper_dot = "Persistent_Level:PersistentLevel.Build_ConveyorBeltMk1_C_420"

display_numbers = [h_tens_conveyor_names, h_ones_conveyor_names, m_tens_conveyor_names, m_ones_conveyor_names]
turbo_fuel = "/Game/FactoryGame/Resource/Parts/Turbofuel/Desc_TurboFuel.Desc_TurboFuel_C"
coal = "/Game/FactoryGame/Resource/RawResources/Coal/Desc_Coal.Desc_Coal_C"
json_save_path = "dclock.json"

def clock_numbers():
    for i in range(12):
        if i == 0:
            i = 12
        for j in range(60):
            s = format(i, "02d") + format(j,"02d")
            yield tuple(int(i) for i in s)

with open(json_save_path, 'rb') as f:
    save_json = json.load(f)
    # write the dots
    SegmentWriter("upper_dot", upper_dot, save_json).write(turbo_fuel)
    SegmentWriter("lower_dot", lower_dot, save_json).write(turbo_fuel)

nws = [NumberWriter(digit, save_json, turbo_fuel, coal) for digit in display_numbers]

# write some black for padding
    for nw in nws:
        nw.write_off(5)

# write the clock numbers
    for nums in clock_numbers():
        for nw, num in zip(nws, nums):
            nw.write_number(num, 2)

# write some black for padding
    for nw in nws:
        nw.write_off(5)

# write boob just for fun
    for nw, num in zip(nws, (8,0,0,8)):
        nw.write_number(num, 10)

json_save_out_path = "dclock-loaded.json"
with open(json_save_out_path, 'w') as f:
    json.dump(obj=save_json, fp=f, indent="  ")

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