Python2.7定义一个支持函数来计算平均值

我试图定义一个支持函数

getMean（alist）

来计算将从另一个函数

getStats（city\u populations）

打印出来的平均值

我的代码：

def getMean(alist):
    alist = sum(city_population,0.0)/len(city_population)


def getStats(city_populations):
    city_populations.sort(key=int)
    print "The population data in asecending order is:", city_populations
    city_populations.sort(reverse=True)
    print "The population data in descending order is:", city_populations
    print "The max value of the population data is", max(city_populations)
    print "The min value of the populatioon data is", min(city_populations)
    average = getMean(alist)
    print "The mean of the collected data is",average

错误：

NameError:未定义名称“alist”

---

如何启用

getStats

来使用

getMean

中的值？

如果您已经解决了问题，请选择一个答案或删除您的问题我正在尝试接受您的答案，但我不断收到一个错误，说几分钟后我可以接受

# You passed in the wrong variable
average = getMean(city_population)

# The variable you passed is now called 'alist'
# And by returning the average, your function getStats now has access to it
def getmean(alist):
    return sum(alist,0.0)/len(alist)