问在python中计算平均值和比较
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Stack Overflow用户

提问于 2013-05-29 00:57:37

回答 2查看 376关注 0票数 0

我有一组值，tgat表示邮政编码中的平均人数。这些是pcode1 = 239、pcode2 = 245、pcode3 = 210和pcode4 = 217，现在我被卡住了。我假设平均值是allpcode = 220。

有没有办法用python写一段代码，这样我就可以把每个单独的pcode与总平均值进行比较？我想要做的是，比较pcode1和allpcode，如果pcode1高于/低于allpcode，则显示pcode1的平均值，并表示pcode1低于allpcode或高于allpcode。然后，我想对所有其他pcode重复:)

我想在屏幕上显示所有较低的平均值和所有较高的平均值。

所以类似于pcode 3和4的平均值低于所有pcode平均值，而pcode 1和2高于所有p代码。

有没有可能创建这样的代码，因为我不知道如何开始/从哪里开始？

average

python

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回答 2

Stack Overflow用户

发布于 2013-05-29 01:06:23

在这种情况下，您经常希望迭代一组值中的所有值，通常最好使用单个list、dict或其他集合变量，而不是一堆单独的变量。例如：

pcodes = {1: 239, 2: 245, 3: 210, 4: 217}

现在，您可以像这样编写代码：

pcodes = {1: 239, 2: 245, 3: 210, 4: 217}
allpcode = 220

for pcode, value in pcodes.items():
    if value < allpcode:
        print('code {} is lower than allpcode'.format(pcode))
    elif value > allpcode:
        print('code {} is higher than allpcode'.format(pcode))

如果你真的想要有独立的变量，你必须做更多的工作，如下所示：

pcode1 = 239
pcode2 = 245
pcode3 = 210
pcode4 = 217
allpcode = 220

for i, value in enumerate((pcode1, pcode2, pcode3, pcode4)):
    if value < allpcode:
        print('code {} is lower than allpcode'.format(i + 1))
    elif value > allpcode:
        print('code {} is higher than allpcode'.format(i + 1))

票数 0

Stack Overflow用户

发布于 2013-05-29 01:07:14

如果您只想匹配值，则可以使用列表：

>>> pcode1 = 239
>>> pcode2 = 245
>>> pcode3 = 210
>>> pcode4 = 217
>>> lis = [pcode1, pcode2, pcode3, pcode4]
>>> allpcode= 220

>>> for i,x in enumerate(lis):
    if x < allpcode:
        print "pcode{} is less than {}".format(i+1,allpcode)
    elif x > allpcode:    
        print "pcode{} is greater than {}".format(i+1,allpcode)
...         
pcode1 is greater than 220
pcode2 is greater than 220
pcode3 is less than 220
pcode4 is less than 220

最好使用字典：

因为变量只是对python中的值的引用，所以你不能访问变量名。如果你有很多pcodes，那么为每一个都定义一个变量不是解决这个问题的好方法，使用字典会更简洁。

#create dictionary with keys named pcode1, pcode2,...     
>>> dic = {'pcode1':239, 'pcode2':245, 'pcode3':210, 'pcode4':217}

>>> for k,v in dic.items():
    if v < allpcode:
        print "{} is less than {}".format(k ,'allpcode')
    elif v > allpcode:    
        print "{} is greater than {}".format(k,'allpcode')
...         
pcode3 is less than allpcode
pcode2 is greater than allpcode
pcode1 is greater than allpcode
pcode4 is less than allpcode