Question

所以，我得到了一个非常奇怪的错误。由于某种原因，python不会随机导入模块，在我看来它是作为函数导入它（as seen here）。它为什么这样做？使用import random和random.choice()可以在其他模块中正常运行。为什么不在这里？

更新：原来我在logic.py中再次定义了随机数。我已经忘记了，因为我不再使用它了。评论它，它工作正常。

回溯：

Traceback (most recent call last):
  File "H:\workspace37\RockPaperScissors\irps\driver.py", line 20, in <module>
    print "%r" % dtree.root.get_value(history)
  File "H:\workspace37\RockPaperScissors\irps\datastructures.py", line 69, in get_value
    return self.operation(self.left.get_value(history), self.right.get_value(history))
  File "H:\workspace37\RockPaperScissors\irps\datastructures.py", line 69, in get_value
    return self.operation(self.left.get_value(history), self.right.get_value(history))
  File "H:\workspace37\RockPaperScissors\irps\logic.py", line 53, in either
    return random.choice((a, b))
AttributeError: 'function' object has no attribute 'choice'

我试图包含相关的代码。

logic.py：

import random 
#from random import choice # works if I change random.choice(...) to just choice(...)

ROCK = 'R'
PAPER = 'P'
SCISSORS = 'S'
RPS_TUPLE = (ROCK, PAPER, SCISSORS)
RPS_SET = set((ROCK, PAPER, SCISSORS))
PLAYER = 0
OPPONENT = 1
PLAYERS = (PLAYER, OPPONENT)

def assert_in_set(a, b):
    assert a in RPS_SET
    assert b in RPS_SET

def neither(a, b):
    assert_in_set(a, b)
    diff = RPS_SET.difference((a, b))
    print "diff = ", diff
    return random.choice(tuple(diff))

def either(a, b):
    assert_in_set(a, b)
    return random.choice((a, b)) #line 53

#EDITED TO INCLUDE THESE LINES FURTHER DOWN
def random(a, b):
    return random.choice(RPS_TUPLE)

ALL_OPERATORS = (neither, either)

datastructures.py

from collections import deque
from logic import RPS_TUPLE, ALL_OPERATORS, PLAYERS
import random
import sys

class OperationNode(TreeNode):

    def __init__(self, parent, left, right, operation):
        super(OperationNode, self).__init__(parent, left, right)
        self.operation = operation

    def get_value(self, history):
        return self.operation(self.left.get_value(history), self.right.get_value(history)) # line 69


class TerminalNode(TreeNode):

    def __init__(self, parent, player, position):
        super(TerminalNode, self).__init__(parent, None, None)
        self.player = player
        self.position = position

    def get_value(self, history):
        # history is a deque of tuples
        return history[self.position][self.player]

Answer 1

你在logic.py中定义了随机函数吗？

这可能是问题的原因。

>>> def random():
...     pass
...
>>> random.choice
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
AttributeError: 'function' object has no attribute 'choice'

使用import random，使用random.choice会抛出AttributeError

1 个答案: