1-4. Рамазанова Дарина Наимовна. 614

src/part1/constants.py

@@ -19,20 +19,20 @@
 # Все константы, зависящие от ёмкостей *_BITS, должны вычисляться из них.
 
 # Twitter's original Snowflake epoch: 2010-11-04 01:42:54.657 UTC.
-EPOCH_MS_DEFAULT: Final[int] = 0
+EPOCH_MS_DEFAULT: Final[int] = 1288834974657
 
 # Node identifier used when the caller does not supply one.
-NODE_ID_DEFAULT: Final[int] = 0
+NODE_ID_DEFAULT: Final[int] = 1
 
 # Width of each field, in bits.
-TIMESTAMP_BITS: Final[int] = 0
-NODE_ID_BITS: Final[int] = 0
-SEQUENCE_ID_BITS: Final[int] = 0
+TIMESTAMP_BITS: Final[int] = 41
+NODE_ID_BITS: Final[int] = 10
+SEQUENCE_ID_BITS: Final[int] = 12
 
 # Largest value each field can hold.
-TIMESTAMP_MS_MAX: Final[int] = 0
-NODE_ID_MAX: Final[int] = 0
-SEQUENCE_ID_MAX: Final[int] = 0
+TIMESTAMP_MS_MAX: Final[int] = (2**TIMESTAMP_BITS) - 1
+NODE_ID_MAX: Final[int] = (2**NODE_ID_BITS) - 1
+SEQUENCE_ID_MAX: Final[int] = (2**SEQUENCE_ID_BITS) - 1
 
 # Здесь можно добавить собственные вспомогательные константы
 # (например, сдвиги полей при сборке идентификатора).

src/part1/snowflake.py

@@ -13,13 +13,16 @@
 :func:`decode_node_id` and :func:`decode_sequence_id`.
 """
 
-import time  # noqa: F401
+import time
 
 from .constants import (  # noqa: F401
     EPOCH_MS_DEFAULT,
+    NODE_ID_BITS,
     NODE_ID_DEFAULT,
     NODE_ID_MAX,
+    SEQUENCE_ID_BITS,
     SEQUENCE_ID_MAX,
+    TIMESTAMP_BITS,
     TIMESTAMP_MS_MAX,
 )
 
@@ -35,7 +38,7 @@ def read_current_millis(epoch_ms: int) -> int:
         negative if ``epoch_ms`` lies in the future.
     """
     # TODO: реализуйте функцию
-    return 0
+    return int(time.time() * 1000) - epoch_ms
 
 
 def decode_timestamp_ms(snowflake_id: int, epoch_ms: int = EPOCH_MS_DEFAULT) -> int:
@@ -51,7 +54,7 @@ def decode_timestamp_ms(snowflake_id: int, epoch_ms: int = EPOCH_MS_DEFAULT) ->
         generated.
     """
     # TODO: реализуйте функцию
-    return 0
+    return epoch_ms + (snowflake_id >> (NODE_ID_BITS + SEQUENCE_ID_BITS))
 
 
 def decode_node_id(snowflake_id: int) -> int:
@@ -65,7 +68,7 @@ def decode_node_id(snowflake_id: int) -> int:
         ``[0, NODE_ID_MAX]``.
     """
     # TODO: реализуйте функцию
-    return 0
+    return (snowflake_id >> SEQUENCE_ID_BITS) & NODE_ID_MAX
 
 
 def decode_sequence_id(snowflake_id: int) -> int:
@@ -79,7 +82,7 @@ def decode_sequence_id(snowflake_id: int) -> int:
         the range ``[0, SEQUENCE_ID_MAX]``.
     """
     # TODO: реализуйте функцию
-    return 0
+    return snowflake_id & SEQUENCE_ID_MAX
 
 
 def generate_snowflake_id(
@@ -111,4 +114,19 @@ def generate_snowflake_id(
         cases an explanatory message is printed to stdout first.
     """
     # TODO: реализуйте функцию
-    return 0
+    if not (0 <= node_id <= NODE_ID_MAX):
+        print(f"node_id must be in [0, {NODE_ID_MAX}], have {node_id}")
+        return None
+
+    if not (0 <= sequence_id <= SEQUENCE_ID_MAX):
+        print(f"sequence_id must be in [0; {SEQUENCE_ID_MAX}], have {sequence_id}")
+        return None
+
+    vremya = read_current_millis(epoch_ms)
+    if vremya > TIMESTAMP_MS_MAX:
+        print("Timestamps overflows")
+        return None
+
+    return (vremya << (NODE_ID_BITS + SEQUENCE_ID_BITS)) | (
+        node_id << (SEQUENCE_ID_BITS | sequence_id)
+    )

src/part3/crud.py

@@ -20,13 +20,13 @@
 
 from decimal import Decimal
 
-from .storage import (  # noqa: F401
+from .storage import (
     NAME_INDEX,
     PRODUCT_ID_INDEX,
     PRODUCT_ID_MIN,
     Product,
 )
-from .utils import normalize_price, normalize_product_name  # noqa: F401
+from .utils import normalize_price, normalize_product_name
 
 
 def generate_product_id(storage: list[Product]) -> int:
@@ -41,7 +41,9 @@ def generate_product_id(storage: list[Product]) -> int:
         empty.
     """
     # TODO: реализуйте функцию (используйте своё решение части 2)
-    return 0
+    if not storage:
+        return PRODUCT_ID_MIN
+    return max(product[PRODUCT_ID_INDEX] for product in storage) + 1
 
 
 def create_product(
@@ -65,7 +67,20 @@ def create_product(
         is left unchanged and an explanatory message is printed.
     """
     # TODO: реализуйте функцию
-    return 0
+    name, price, quantity = fields
+    name = normalize_product_name(name)
+    if not name:
+        print("product name must not be blank")
+        return None
+    for product in storage:
+        if product[NAME_INDEX] == name:
+            print(f"product name '{name}' is already taken")
+            return None
+    product_id = generate_product_id(storage)
+    price = normalize_price(price)
+    new_product = (product_id, name, price, quantity)
+    storage.append(new_product)
+    return product_id
 
 
 def read_product(storage: list[Product], product_id: int) -> Product | None:
@@ -81,7 +96,11 @@ def read_product(storage: list[Product], product_id: int) -> Product | None:
         printed in that case).
     """
     # TODO: реализуйте функцию (используйте своё решение части 2)
-    return (0, "", Decimal(0), 0)
+    for product in storage:
+        if product[PRODUCT_ID_INDEX] == product_id:
+            return product
+    print(f"no product with id {product_id}")
+    return None
 
 
 def update_product(
@@ -111,7 +130,27 @@ def update_product(
         product to its own current name is allowed.
     """
     # TODO: реализуйте функцию
-    return (0, "", Decimal(0), 0)
+    name, price, quantity = fields
+    name = normalize_product_name(name)
+    if not name:
+        print("product name must not be blank")
+        return None
+    target_index = None
+    for i, product in enumerate(storage):
+        if product[PRODUCT_ID_INDEX] == product_id:
+            target_index = i
+            break
+    if target_index is None:
+        print(f"no product with id {product_id}")
+        return None
+    for product in storage:
+        if product[NAME_INDEX] == name and product[PRODUCT_ID_INDEX] != product_id:
+            print(f"product name '{name}' is already taken")
+            return None
+    price = normalize_price(price)
+    updated_product = (product_id, name, price, quantity)
+    storage[target_index] = updated_product
+    return updated_product
 
 
 def delete_product(storage: list[Product], product_id: int) -> int | None:
@@ -128,4 +167,9 @@ def delete_product(storage: list[Product], product_id: int) -> int | None:
         a message is printed).
     """
     # TODO: реализуйте функцию (используйте своё решение части 2)
-    return 0
+    for i, product in enumerate(storage):
+        if product[PRODUCT_ID_INDEX] == product_id:
+            del storage[i]
+            return product_id
+    print(f"no product with id {product_id}")
+    return None

src/part3/run_admin.py

@@ -29,7 +29,7 @@
 it.
 """
 
-from decimal import Decimal, InvalidOperation  # noqa: F401
+from decimal import Decimal, InvalidOperation
 from typing import Final
 
 from .crud import (  # noqa: F401
@@ -39,12 +39,23 @@
     update_product,
 )
 from .storage import Product
-from .utils import get_storage_str_representation  # noqa: F401
+from .utils import get_storage_str_representation
 
 
 # TODO: задайте приглашение и текст справки
-PROMPT: Final[str] = ""
-HELP_TEXT: Final[str] = ""
+PROMPT: Final[str] = "admin> "
+HELP_TEXT: Final[str] = """Available commands:
+  help                          show this message
+  exit                          leave the console
+  show                          print the whole store as a table
+  create <name...> <price> <quantity>  add a product, print its new id
+  read <id>                     print the product with that id
+  update <id> <name...> <price> <quantity>  overwrite that product's fields
+  delete <id>                   remove the product with that id
+
+For create and update the price and quantity are the last two words of the
+line; everything before them is the product name, so it may contain spaces
+(for example "Gibson SG Junior") and needs no quoting."""
 
 
 def show_help() -> None:
@@ -55,6 +66,7 @@ def show_help() -> None:
     note on how multi-word names are parsed.
     """
     # TODO: реализуйте функцию
+    print(HELP_TEXT)
 
 
 def print_result(result: object) -> None:
@@ -66,6 +78,8 @@ def print_result(result: object) -> None:
             printed in that case.
     """
     # TODO: реализуйте функцию
+    if result is not None:
+        print(result)
 
 
 def run_command(storage: list[Product], line: str) -> bool:
@@ -89,13 +103,51 @@ def run_command(storage: list[Product], line: str) -> bool:
             ``update`` does not parse as a decimal number.
     """
     # TODO: реализуйте функцию
-    return False
+    parts = line.split()
+    if not parts:
+        return True
+    command = parts[0]
+    if command == "help":
+        show_help()
+    elif command == "exit":
+        return False
+    elif command == "show":
+        print(get_storage_str_representation(storage))
+    elif command == "read" or command == "delete":
+        if len(parts) != 2:
+            print(f"'{line}' is not a command")
+            return True
+        product_id = int(parts[1])
+        print_result(read_product(storage, product_id))
+    elif command == "create":
+        if len(parts) < 4:
+            print(f"'{line}' is not a command")
+            return True
+        name = " ".join(parts[1:-2])
+        price = Decimal(parts[-2])
+        quantity = int(parts[-1])
+        result = create_product(storage, (name, price, quantity))
+        print_result(result)
+    elif command == "update":
+        if len(parts) < 5:
+            print(f"'{line}' is not a command")
+            return True
+        product_id = int(parts[1])
+        name = " ".join(parts[2:-2])
+        price = Decimal(parts[-2])
+        quantity = int(parts[-1])
+        updated = update_product(storage, product_id, (name, price, quantity))
+        print_result(updated)
+    else:
+        print(f"'{line}' is not a command")
+
+    return True
 
 
 def main() -> None:
     """Run the admin console until the ``exit`` command is entered.
 
-    A single product store is created empty and kept in memory for the
+    A sngle product store is created empty and kept in memory for the
     whole session. Each iteration reads one line from stdin, strips its
     surrounding whitespace and hands it to :func:`run_command`. A line
     that names a command but whose id, price or quantity argument does

src/part3/storage.py

@@ -27,9 +27,9 @@
 # TODO: задайте позиции полей внутри кортежа Product (используйте своё решение
 # части 2)
 PRODUCT_ID_INDEX: Final = 0
-NAME_INDEX: Final = 0
-PRICE_INDEX: Final = 0
-QUANTITY_INDEX: Final = 0
+NAME_INDEX: Final = 1
+PRICE_INDEX: Final = 2
+QUANTITY_INDEX: Final = 3
 
 # TODO: задайте идентификатор первого товара в пустом хранилище
-PRODUCT_ID_MIN: Final[int] = 0
+PRODUCT_ID_MIN: Final[int] = 1