如何使用exec根据Python3中的字典将列表分配给变量？

Question

我想将 list 分配给变量，而list和variable都存储在字典中measurements。这是measurements具有较少变量的 Python 2 版本：measurements = {'tg': [8.184e+16, 8.345e+16, 8.045e+16, 8.520e+16, 8.322e+16, 7.622e+16, 4.305e+16, 2.203e+16]}def f():    for key,val in measurements.items():        exec(key + ' = val') in globals(),locals()    print (tg)f()但是，正如在另一个问题中提到的，它不适合 Python 3。如果我这样编写代码：measurements = {'tg': [8.184e+16, 8.345e+16, 8.045e+16, 8.520e+16, 8.322e+16, 7.622e+16, 4.305e+16, 2.203e+16]}def f():    for key,val in measurements.items():        ldict = {}        exec(key + ' = val', globals(),ldict)        key = ldict[key]        # exec(key + ' = val') in globals(),locals()    print (tg)f()我收到此错误： NameError: name 'val' is not defined

Answer 1

measurements = {'tg': [8.184e+16, 8.345e+16, 8.045e+16, 8.520e+16, 8.322e+16, 7.622e+16, 4.305e+16, 2.203e+16]}

def f():

    for key,val in measurements.items():

        exec('{} = {}'.format(key, val))

    print (tg)

    local = locals()

    for key in measurements.keys():

        print 'Key: ', key, ', Value: ', local[key]

f()

蟒蛇3：

measurements = {'tg': [8.184e+16, 8.345e+16, 8.045e+16, 8.520e+16, 8.322e+16, 7.622e+16, 4.305e+16, 2.203e+16]}

def f():

    for key,val in measurements.items():

        exec('global {};{} = {}'.format(key, key, val))

    print ('tg: ', tg)

    vars = globals()

    for key in measurements.keys():

        print ('Key: ', key, ', Value: ', vars[key])

f()

输出：

[8.184e+16, 8.345e+16, 8.045e+16, 8.52e+16, 8.322e+16, 7.622e+16, 4.305e+16, 2.203e+16]

Key:  tg , Value:  [8.184e+16, 8.345e+16, 8.045e+16, 8.52e+16, 8.322e+16, 7.622e+16, 4.305e+16, 2.203e+16]