为什么我会收到"NameError:名称'...'未定义"在python模块中? [英] Why do I get "NameError: name '...' is not defined" in python module?

问题描述

文件名:recom.py

# Returns a distance-based similarity score for person1 and person2
def sim_distance(prefs,person1,person2):
# Get the list of shared_items
    si={}
    for item in prefs[person1]:
        if item in prefs[person2]:
            si[item]=1
    # if they have no ratings in common, return 0
    if len(si)==0: return 0
    # Add up the squares of all the differences
    sum_of_squares=sum([pow(prefs[person1][item]-prefs[person2][item],2)
    for item in prefs[person1] if item in prefs[person2]])
    return 1/(1+sum_of_squares)

在尝试执行 reload(recom)

Am getting the error ,when i try to do reload(recom)

跟踪(最近一次通话结束): 文件"，第1行，在 NameError:名称"recom"未定义

Traceback (most recent call last): File "", line 1, in NameError: name 'recom' is not defined

推荐答案

我使用python 3.4.3，但我遇到了同样的问题.下面的解决方案为我解决了.

I use python 3.4.3, and I just encountered the same problem. The below solution solved it for me.

使用reload()时，还应该在使用from imp import reload之前使用它.

When you use reload() you should also use from imp import reload before you use it.

关于获得欧氏距离分数，您可以得到如下答案:

As to getting the Euclidean Distance Score, you can get your answer like:

 from recom import critics
 from recom import sim_distance
 sim_distance(critics,'Lisa Rose','Gene Seymour')

结果是:0.29429805508554946

The result is: 0.29429805508554946

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