全局变量不更新？

Question

import datetime as DTimport calendardef getMonthRanges(startDate, endDate):    while startDate <= endDate:        year, month = startDate.year, startDate.month        weekday, day = calendar.monthrange(year, month)        end = min(DT.date(year, month, day), endDate)        yield (startDate, end)        startDate = end+DT.timedelta(days=1)ranges = [map(str, interval)           for interval in getMonthRanges(DT.date(2011,9,11), DT.date(2013,4,24))]print(ranges)产量[['2011-09-11', '2011-09-30'], ['2011-10-01', '2011-10-31'], ['2011-11-01', '2011-11-30'], ['2011-12-01', '2011-12-31'], ['2012-01-01', '2012-01-31'], ['2012-02-01', '2012-02-29'], ['2012-03-01', '2012-03-31'], ['2012-04-01', '2012-04-30'], ['2012-05-01', '2012-05-31'], ['2012-06-01', '2012-06-30'], ['2012-07-01', '2012-07-31'], ['2012-08-01', '2012-08-31'], ['2012-09-01', '2012-09-30'], ['2012-10-01', '2012-10-31'], ['2012-11-01', '2012-11-30'], ['2012-12-01', '2012-12-31'], ['2013-01-01', '2013-01-31'], ['2013-02-01', '2013-02-28'], ['2013-03-01', '2013-03-31'], ['2013-04-01', '2013-04-24']]分享全局变量不会更新，但是我将其导入到正在更新的解释器中。请帮我如何更新字典 dimport texttableclass Lc:    d={50:8,100:6,200:4,500:3,1000:2,2000:1}    he=['container_size_in_ltrs','qty']    def inventory(self,g):        d1=self.d        if d1!=g:            d1=g        self.d=g        l1=d1.keys()        l1.sort()        li=[]        ls=[]        for i in l1:            li=[]            li.append(i)            li.append(d1[i])            ls.append(li)        table=texttable.Texttable()        table.header(self.he)        table.add_rows(ls,header=False)        print table.draw()    def add_inv(self,k,v):        d=self.d        for i,j in d.items():            if k==i:                d[k]=d[k]+v        print d        return dz=Lc()g=z.add_inv(500,2)print z.d

Answer 1

您的全局变量正在更新。提取部分代码：

class Lc:

    d={50:8,100:6,200:4,500:3,1000:2,2000:1}

    he=['container_size_in_ltrs','qty']

    def add_inv(self,k,v):

        d=self.d

        for i,j in d.items():

            if k==i:

                d[k]=d[k]+v

        print d

        return d

z=Lc()

x=Lc()

print "Add 2 to 500, expect 500:5"

g=z.add_inv(500,2)

print z.d

# Notice that x.add_inv also modifies z.d

print "Add 5 to 500, expect 500:7 because x initialized d again"

h=x.add_inv(500,2)

print z.d

我得到：

Add 2 to 500, expect 500:5

{100: 6, 200: 4, 2000: 1, 1000: 2, 50: 8, 500: 5}

{100: 6, 200: 4, 2000: 1, 1000: 2, 50: 8, 500: 5}

Add 5 to 500, expect 500:7 because x initialized d again

{100: 6, 200: 4, 2000: 1, 1000: 2, 50: 8, 500: 7}

{100: 6, 200: 4, 2000: 1, 1000: 2, 50: 8, 500: 7}

我只是希望您确实试图以d这种卑鄙的方式宣布其为全球性。