NameError:调用类函数时未定义全局名称'getAllElements'

时间:2012-02-09 14:51:50

标签: python class instance nameerror

我可能会忽视某些事情,但我得到了一个课程"解析"功能" getAllElements"。在主脚本中,我使用

导入解析
from parseXML import parse. 

然后我做

parse = parse(file) 

工作正常。但是当我做的时候

print parseXML.parse(file).getAllElements()

我收到以下错误:

NameError: global name 'getAllElements' is not defined 

以下是代码。我哪里错了?

编辑:在评论后更改了代码

class parse:
    # Constructor
    def __init__(self, file):
        # parse the xml file into a tree
        tree = xml.parse('/homes/ndeklein/test.featureXML')
        # Get the root node of the xml file
        self.rootElement = tree.getroot()
        # Set self.parent to rootElement, because the first element won't have a parent (because it is the root)
        self.parent = 'rootElement'
        # dictionary that contains the parent -> child relation
        self.parentChildDict = {}

    # Go recursively through all the elements in the xml file, starting at the choosen rootElement, until only leaves (elements that don't contain elements) are left
    # Return all the elements from the xml file
    def getAllElements(self):
        # if this is the first time this parent is seen:
        #     make elementDict with parent as key and child as value in a list
        if not self.parentChildDict.has_key(self.parent):
            self.parentChildDict[self.parent] = [self.rootElement]
        # else: add the child to the parent dictionary
        else:
            self.parentChildDict[self.parent].append(self.rootElement)
        for node in self.rootElement:
            # if the len of rootElement > 0 (there are more elements in the element):
            #    set self.parent to be node and recursively call getAllElements
            if len(self.rootElement) > 0:
                self.parent = node
                getAllElements()
        return self.parentChildDict

#!/usr/bin/env python

# author: ndeklein
# date: 08/02/2012
# function: calls out the script

import parseXML
import xml.etree.cElementTree as xml
import sys

#Parse XML directly from the file path
file = '/homes/ndeklein/EP-B1.featureXML'
# parse the xml file into a tree
print parseXML.parse(file).getAllElements()

2 个答案:

答案 0 :(得分:1)

看起来parseXML不在您的本地命名空间中,因为您正在执行from parseXML import parse。您是否尝试直接导入parseXML并执行此操作?

import parseXML 
parseXML.parse(file).getAllElements()

您正在获取NameError,因为您无法在方法中调用getAllElements()。它必须是self.getAllElements()

正如评论中所提到的,代码中还有其他逻辑错误需要纠正。

答案 1 :(得分:1)

正如Praveen所暗示的那样,这是你的进口和风格。

因为你以这种方式导入:

from foo import bar

您不需要(实际上不应该)在您的通话中明确声明foo。

bar.baz()

foo.bar.baz()

所以在你的情况下试试电话:

parse(file).getAllElements()

但是你还需要在你的递归中解决裸调用: getAllElements()可能应该是self.getAllElements()