无法识别Python实例变量 [英] Python Instance Variable not recognized

问题描述

我正在使用Python开发此OOP程序

I'm working on this OOP program in Python

class SimpleString():    
    popSize = 1000 #Should be even number
    displaySize = 5
    alphatbet = "abcdefghijklmnopqrstuvwxyz "
    def __init__(self):
        pop = numpy.empty(self.popSize, object)
        target = self.getTarget()
        targetSize = len(target)

    def genNewPop(self):
        for i in xrange(self.popSize):
            pop[i] = Item(self.genNewString())

    def genNewString(self):
        s = ""
        for i in xrange(targetSize):
            s += chr(random.randint(len(alphabet)))
        return s

def main():
    ss = SimpleString()
    ss.genNewPop()
main()

在genNewString(self)方法中，它一直告诉我未定义实例变量targetSize！我尝试将self.targetSize放在其位置，但随后我得到一个错误，即SimpleString实例没有属性'targetSize'，即使它被分配为实例变量.

In the genNewString(self) method it keeps telling me the instance variable targetSize is not defined! I tried putting self.targetSize in its place but then I get an error SimpleString instance has no attribute 'targetSize' even though it is assigned as an instance variable.

推荐答案

Python中的所有成员都需要显式的self.:

All members in Python require the explicit self.:

def __init__(self):
    self.pop = numpy.empty(self.popSize, object)
    self.target = self.getTarget()
    self.targetSize = len(self.target)

def genNewString(self):
    s = ""
    for i in xrange(self.targetSize):
        s += chr(random.randint(len(self.alphabet)))
    return s

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