import bisect
import collections

PriceEvent = collections.namedtuple("PriceEvent", ["timestamp", "price"])


class Stock:
    def __init__(self, symbol):
        """Constructor for Stock instance.

        Args:
            symbol: The stock symbol.
        """
        self.symbol = symbol
        self.price_history = []

    @property
    def price(self):
        """Returns the stocks most recent price.

        Returns: Most recent price.

        """
        return self.price_history[-1].price if self.price_history else None

    def update(self, timestamp, price):
        """Updates the stock's price history.

        Args:
            timestamp: The timestamp of the update.
            price: The new price of the stock.
        """
        if price < 0:
            raise ValueError("price should not be negative")
        bisect.insort_left(self.price_history, PriceEvent(timestamp, price))

    def is_increasing_trend(self):
        """Determines if last three prices were ascending in value.

        Returns: True if there is an increasing trend, False if not.

        """
        return self.price_history[-3].price < self.price_history[-2].price < self.price_history[-1].price

import bisect
import collections

stock_price_event = collections.namedtuple("stock_price_event", ["timestamp", "price"])


class Stock:
    def __init__(self, symbol):
        """A Stock object representing its price history.

        Args:
            symbol (str): The stock symbol.

        Attributes:
            symbol (str): The stock symbol.
            price (float): The most recent price.

        """
        self.symbol = symbol
        self.price_history = []

    @property
    def price(self):
        """Returns the stocks most recent price.

        Returns: Most recent price.

        """
        return self.price_history[-1].price if self.price_history else None

    def update(self, timestamp, price):
        """Updates the stock's price history.

        Args:
            timestamp: The timestamp of the update.
            price: The new price of the stock.

        """
        if price < 0:
            raise ValueError("price should not be negative")
        bisect.insort_left(self.price_history, stock_price_event(timestamp, price))

    def is_increasing_trend(self):
        """Determines if last three prices were ascending in value.

        Returns: True if there is an increasing trend, False if not.

        """
        return self.price_history[-3].price < self.price_history[-2].price < self.price_history[-1].price

Update comments and variable names.
Update comments and variable names.

  import bisect
  import collections
  
- PriceEvent = collections.namedtuple("PriceEvent", ["timestamp", "price"])
+ stock_price_event = collections.namedtuple("stock_price_event", ["timestamp", "price"])
  
  
  class Stock:
      def __init__(self, symbol):
-         """Constructor for Stock instance.
+         """A Stock object representing its price history.
  
          Args:
-             symbol: The stock symbol.
+             symbol (str): The stock symbol.
+ 
+         Attributes:
+             symbol (str): The stock symbol.
+             price (float): The most recent price.
+ 
          """
          self.symbol = symbol
          self.price_history = []
  
      @property
      def price(self):
          """Returns the stocks most recent price.
  
          Returns: Most recent price.
  
          """
          return self.price_history[-1].price if self.price_history else None
  
      def update(self, timestamp, price):
          """Updates the stock's price history.
  
          Args:
              timestamp: The timestamp of the update.
              price: The new price of the stock.
+ 
          """
          if price < 0:
              raise ValueError("price should not be negative")
-         bisect.insort_left(self.price_history, PriceEvent(timestamp, price))
+         bisect.insort_left(self.price_history, stock_price_event(timestamp, price))
  
      def is_increasing_trend(self):
          """Determines if last three prices were ascending in value.
  
          Returns: True if there is an increasing trend, False if not.
  
          """
          return self.price_history[-3].price < self.price_history[-2].price < self.price_history[-1].price
  
Update comments and variable names.
## Code Before:
import bisect
import collections

PriceEvent = collections.namedtuple("PriceEvent", ["timestamp", "price"])


class Stock:
    def __init__(self, symbol):
        """Constructor for Stock instance.

        Args:
            symbol: The stock symbol.
        """
        self.symbol = symbol
        self.price_history = []

    @property
    def price(self):
        """Returns the stocks most recent price.

        Returns: Most recent price.

        """
        return self.price_history[-1].price if self.price_history else None

    def update(self, timestamp, price):
        """Updates the stock's price history.

        Args:
            timestamp: The timestamp of the update.
            price: The new price of the stock.
        """
        if price < 0:
            raise ValueError("price should not be negative")
        bisect.insort_left(self.price_history, PriceEvent(timestamp, price))

    def is_increasing_trend(self):
        """Determines if last three prices were ascending in value.

        Returns: True if there is an increasing trend, False if not.

        """
        return self.price_history[-3].price < self.price_history[-2].price < self.price_history[-1].price

## Instruction:
Update comments and variable names.
## Code After:
import bisect
import collections

stock_price_event = collections.namedtuple("stock_price_event", ["timestamp", "price"])


class Stock:
    def __init__(self, symbol):
        """A Stock object representing its price history.

        Args:
            symbol (str): The stock symbol.

        Attributes:
            symbol (str): The stock symbol.
            price (float): The most recent price.

        """
        self.symbol = symbol
        self.price_history = []

    @property
    def price(self):
        """Returns the stocks most recent price.

        Returns: Most recent price.

        """
        return self.price_history[-1].price if self.price_history else None

    def update(self, timestamp, price):
        """Updates the stock's price history.

        Args:
            timestamp: The timestamp of the update.
            price: The new price of the stock.

        """
        if price < 0:
            raise ValueError("price should not be negative")
        bisect.insort_left(self.price_history, stock_price_event(timestamp, price))

    def is_increasing_trend(self):
        """Determines if last three prices were ascending in value.

        Returns: True if there is an increasing trend, False if not.

        """
        return self.price_history[-3].price < self.price_history[-2].price < self.price_history[-1].price
