对于Python中的正实数，“ math.floor（x）”和“ int（x）”会产生不同的结果吗？Does “math.floor(x)” and “int(x)” produce different results for positive real numbers in Python?

``````class RectangularRoom(object):
"""
A RectangularRoom represents a rectangular region containing clean or dirty
tiles.

A room has a width and a height and contains (width * height) tiles. At any
particular time, each of these tiles is either clean or dirty.
"""
def __init__(self, width, height):
"""
Initializes a rectangular room with the specified width and height.

Initially, no tiles in the room have been cleaned.

width: an integer > 0
height: an integer > 0
"""
self.width = width
self.height = height
self.room_coordinates = []
for m in range(self.width):
for n in range(self.height):
self.room_coordinates.append((m,n))
self.cleaned = []
def cleanTileAtPosition(self, pos):
"""
Mark the tile under the position POS as cleaned.

Assumes that POS represents a valid position inside this room.

pos: a Position
"""
self.cleaned.append((int(pos.getX()), int(pos.getY())))

def isTileCleaned(self, m, n):
"""
Return True if the tile (m, n) has been cleaned.

Assumes that (m, n) represents a valid tile inside the room.

m: an integer
n: an integer
returns: True if (m, n) is cleaned, False otherwise
"""
assert type (m)== int and type (n) == int
return (m,n) in self.cleaned

def getNumTiles(self):
"""
Return the total number of tiles in the room.

returns: an integer
"""
return self.width*self.height

def getNumCleanedTiles(self):
"""
Return the total number of clean tiles in the room.

returns: an integer
"""
return len(self.cleaned)

def getRandomPosition(self):
"""
Return a random position inside the room.

returns: a Position object.
"""
return Position (random.randrange(0 , self.width), random.randrange(0 , self.height))

def isPositionInRoom(self, pos):
"""
Return True if pos is inside the room.

pos: a Position object.
returns: True if pos is in the room, False otherwise.
"""
return (int(pos.getX()), int(pos.getY())) in self.room_coordinates
``````

``````class RectangularRoom(object):
"""
A RectangularRoom represents a rectangular region containing clean or dirty
tiles.

A room has a width and a height and contains (width * height) tiles. At any
particular time, each of these tiles is either clean or dirty.
"""
def __init__(self, width, height):
"""
Initializes a rectangular room with the specified width and height.

Initially, no tiles in the room have been cleaned.

width: an integer > 0
height: an integer > 0
"""
self.width = width
self.height = height
self.tiles = {}
for x in range(self.width):
for y in range(self.height):
self.tiles[(x, y)] = False

def cleanTileAtPosition(self, pos):
"""
Mark the tile under the position POS as cleaned.

Assumes that POS represents a valid position inside this room.

pos: a Position
"""
x = math.floor(pos.getX())
y = math.floor(pos.getY())
self.tiles[(x, y)] = True

def isTileCleaned(self, m, n):
"""
Return True if the tile (m, n) has been cleaned.

Assumes that (m, n) represents a valid tile inside the room.

m: an integer
n: an integer
returns: True if (m, n) is cleaned, False otherwise
"""
return self.tiles[(m, n)]

def getNumTiles(self):
"""
Return the total number of tiles in the room.

returns: an integer
"""
return self.width * self.height

def getNumCleanedTiles(self):
"""
Return the total number of clean tiles in the room.

returns: an integer
"""
return sum(self.tiles.values())

def getRandomPosition(self):
"""
Return a random position inside the room.

returns: a Position object.
"""
return Position(random.random() * self.width,
random.random() * self.height)

def isPositionInRoom(self, pos):
"""
Return True if pos is inside the room.

pos: a Position object.
returns: True if pos is in the room, False otherwise.
"""
return ((0 <= pos.getX() < self.width)
and (0 <= pos.getY() < self.height))
``````

4 个回复4

===============>>#1 票数：5 已采纳

``````self.cleaned.append((int(pos.getX()), int(pos.getY())))
``````

``````return len(self.cleaned)
``````

（顺便说一下，由于random.randrange返回一个整数。.整数转换应该什么都不做！）

===============>>#3 票数：1

``````>>> a = 1.2
>>> b = int(a)
>>> c = math.floor(a)
>>> b
1
>>> c
1.0
>>> type(c)
<type 'float'>
>>> type(a)
<type 'float'>
>>> type(b)
<type 'int'>
``````