这是我的XML文件：
<?xml version="1.0" ?>
<Items>
<Item>
<ASIN>3570102769</ASIN>
<DetailPageURL>http://www.amazon.de/Inside-IS-Tage-Islamischen-Staat/dp/3570102769%3FSubscriptionId%3DAKIAI554OLCUMRCYB7ZA%26tag%3DjPp08vuSO4osfgfbCbEdF7TNqnWOm7YtprtqRPB9%26linkCode%3Dxm2%26camp%3D2025%26creative%3D165953%26creativeASIN%3D3570102769</DetailPageURL>
<ItemLinks>
<ItemLink>
<Description>Add To Wishlist</Description>
<URL>http://www.amazon.de/gp/registry/wishlist/add-item.html%3Fasin.0%3D3570102769%26SubscriptionId%3DAKIAI554OLCUMRCYB7ZA%26tag%3DjPp08vuSO4osfgfbCbEdF7TNqnWOm7YtprtqRPB9%26linkCode%3Dxm2%26camp%3D2025%26creative%3D12738%26creativeASIN%3D3570102769</URL>
</ItemLink>
<ItemLink>
<Description>Tell A Friend</Description>
<URL>http://www.amazon.de/gp/pdp/taf/3570102769%3FSubscriptionId%3DAKIAI554OLCUMRCYB7ZA%26tag%3DjPp08vuSO4osfgfbCbEdF7TNqnWOm7YtprtqRPB9%26linkCode%3Dxm2%26camp%3D2025%26creative%3D12738%26creativeASIN%3D3570102769</URL>
</ItemLink>
<ItemLink>
<Description>All Customer Reviews</Description>
<URL>http://www.amazon.de/review/product/3570102769%3FSubscriptionId%3DAKIAI554OLCUMRCYB7ZA%26tag%3DjPp08vuSO4osfgfbCbEdF7TNqnWOm7YtprtqRPB9%26linkCode%3Dxm2%26camp%3D2025%26creative%3D12738%26creativeASIN%3D3570102769</URL>
</ItemLink>
<ItemLink>
<Description>All Offers</Description>
<URL>http://www.amazon.de/gp/offer-listing/3570102769%3FSubscriptionId%3DAKIAI554OLCUMRCYB7ZA%26tag%3DjPp08vuSO4osfgfbCbEdF7TNqnWOm7YtprtqRPB9%26linkCode%3Dxm2%26camp%3D2025%26creative%3D12738%26creativeASIN%3D3570102769</URL>
</ItemLink>
</ItemLinks>
<ItemAttributes>
<Author>Jürgen Todenhöfer</Author>
<Binding>Gebundene Ausgabe</Binding>
<EAN>9783570102763</EAN>
<EANList>
<EANListElement>9783570102763</EANListElement>
</EANList>
<ISBN>3570102769</ISBN>
<IsEligibleForTradeIn>1</IsEligibleForTradeIn>
<ItemDimensions>
<Height Units="hundredths-inches">874</Height>
<Length Units="hundredths-inches">575</Length>
<Width Units="hundredths-inches">126</Width>
</ItemDimensions>
<Label>C. Bertelsmann Verlag</Label>
<Languages>
<Language>
<Name>Deutsch</Name>
<Type>Published</Type>
</Language>
<Language>
<Name>Deutsch</Name>
<Type>Original</Type>
</Language>
<Language>
<Name>Deutsch</Name>
<Type>Unbekannt</Type>
</Language>
</Languages>
<ListPrice>
<Amount>1799</Amount>
<CurrencyCode>EUR</CurrencyCode>
<FormattedPrice>EUR 17,99</FormattedPrice>
</ListPrice>
<Manufacturer>C. Bertelsmann Verlag</Manufacturer>
<ManufacturerMinimumAge Units="months">192</ManufacturerMinimumAge>
<NumberOfPages>288</NumberOfPages>
<PackageDimensions>
<Height Units="hundredths-inches">118</Height>
<Length Units="hundredths-inches">567</Length>
<Weight Units="hundredths-pounds">93</Weight>
<Width Units="hundredths-inches">252</Width>
</PackageDimensions>
<PackageQuantity>1</PackageQuantity>
<ProductGroup>Book</ProductGroup>
<ProductTypeName>ABIS_BOOK</ProductTypeName>
<PublicationDate>2015-04-27</PublicationDate>
<Publisher>C. Bertelsmann Verlag</Publisher>
<Studio>C. Bertelsmann Verlag</Studio>
<Title>Inside IS - 10 Tage im 'Islamischen Staat'</Title>
<TradeInValue>
<Amount>930</Amount>
<CurrencyCode>EUR</CurrencyCode>
<FormattedPrice>EUR 9,30</FormattedPrice>
</TradeInValue>
</ItemAttributes>
<OfferSummary>
<LowestNewPrice>
<Amount>1799</Amount>
<CurrencyCode>EUR</CurrencyCode>
<FormattedPrice>EUR 17,99</FormattedPrice>
</LowestNewPrice>
<LowestUsedPrice>
<Amount>1390</Amount>
<CurrencyCode>EUR</CurrencyCode>
<FormattedPrice>EUR 13,90</FormattedPrice>
</LowestUsedPrice>
<LowestCollectiblePrice>
<Amount>4999</Amount>
<CurrencyCode>EUR</CurrencyCode>
<FormattedPrice>EUR 49,99</FormattedPrice>
</LowestCollectiblePrice>
<TotalNew>56</TotalNew>
<TotalUsed>8</TotalUsed>
<TotalCollectible>1</TotalCollectible>
<TotalRefurbished>0</TotalRefurbished>
</OfferSummary>
<Offers>
<TotalOffers>1</TotalOffers>
<TotalOfferPages>1</TotalOfferPages>
<MoreOffersUrl>http://www.amazon.de/gp/offer-listing/3570102769%3FSubscriptionId%3DAKIAI554OLCUMRCYB7ZA%26tag%3DjPp08vuSO4osfgfbCbEdF7TNqnWOm7YtprtqRPB9%26linkCode%3Dxm2%26camp%3D2025%26creative%3D12738%26creativeASIN%3D3570102769</MoreOffersUrl>
<Offer>
<OfferAttributes>
<Condition>New</Condition>
</OfferAttributes>
<OfferListing>
<OfferListingId>9KHCZj9qtL6ucVBPASfXaryQjU8tWbc0n%2F3F4F7GraOKW6Csji2OxpD93%2FkoHwgIGQctlnrtx4RWIeJULAcvvsFhiopFi08JdsZ%2FeO3u6g0%3D</OfferListingId>
<Price>
<Amount>1799</Amount>
<CurrencyCode>EUR</CurrencyCode>
<FormattedPrice>EUR 17,99</FormattedPrice>
</Price>
<Availability>Gewöhnlich versandfertig in 24 Stunden</Availability>
<AvailabilityAttributes>
<AvailabilityType>now</AvailabilityType>
<MinimumHours>0</MinimumHours>
<MaximumHours>0</MaximumHours>
</AvailabilityAttributes>
<IsEligibleForSuperSaverShipping>1</IsEligibleForSuperSaverShipping>
</OfferListing>
</Offer>
</Offers>
</Item>
<Item>
<ASIN>3813506479</ASIN>
<DetailPageURL>http://www.amazon.de/Altes-Land-Roman-D%C3%B6rte-Hansen/dp/3813506479%3FSubscriptionId%3DAKIAI554OLCUMRCYB7ZA%26tag%3DjPp08vuSO4osfgfbCbEdF7TNqnWOm7YtprtqRPB9%26linkCode%3Dxm2%26camp%3D2025%26creative%3D165953%26creativeASIN%3D3813506479</DetailPageURL>
<ItemLinks>
<ItemLink>
<Description>Add To Wishlist</Description>
<URL>http://www.amazon.de/gp/registry/wishlist/add-item.html%3Fasin.0%3D3813506479%26SubscriptionId%3DAKIAI554OLCUMRCYB7ZA%26tag%3DjPp08vuSO4osfgfbCbEdF7TNqnWOm7YtprtqRPB9%26linkCode%3Dxm2%26camp%3D2025%26creative%3D12738%26creativeASIN%3D3813506479</URL>
</ItemLink>
<ItemLink>
<Description>Tell A Friend</Description>
<URL>http://www.amazon.de/gp/pdp/taf/3813506479%3FSubscriptionId%3DAKIAI554OLCUMRCYB7ZA%26tag%3DjPp08vuSO4osfgfbCbEdF7TNqnWOm7YtprtqRPB9%26linkCode%3Dxm2%26camp%3D2025%26creative%3D12738%26creativeASIN%3D3813506479</URL>
</ItemLink>
<ItemLink>
<Description>All Customer Reviews</Description>
<URL>http://www.amazon.de/review/product/3813506479%3FSubscriptionId%3DAKIAI554OLCUMRCYB7ZA%26tag%3DjPp08vuSO4osfgfbCbEdF7TNqnWOm7YtprtqRPB9%26linkCode%3Dxm2%26camp%3D2025%26creative%3D12738%26creativeASIN%3D3813506479</URL>
</ItemLink>
<ItemLink>
<Description>All Offers</Description>
<URL>http://www.amazon.de/gp/offer-listing/3813506479%3FSubscriptionId%3DAKIAI554OLCUMRCYB7ZA%26tag%3DjPp08vuSO4osfgfbCbEdF7TNqnWOm7YtprtqRPB9%26linkCode%3Dxm2%26camp%3D2025%26creative%3D12738%26creativeASIN%3D3813506479</URL>
</ItemLink>
</ItemLinks>
<ItemAttributes>
<Author>Dörte Hansen</Author>
<Binding>Gebundene Ausgabe</Binding>
<EAN>9783813506471</EAN>
<EANList>
<EANListElement>9783813506471</EANListElement>
</EANList>
<ISBN>3813506479</ISBN>
<IsEligibleForTradeIn>1</IsEligibleForTradeIn>
<ItemDimensions>
<Height Units="hundredths-inches">870</Height>
<Length Units="hundredths-inches">567</Length>
<Width Units="hundredths-inches">114</Width>
</ItemDimensions>
<Label>Albrecht Knaus Verlag</Label>
<Languages>
<Language>
<Name>Deutsch</Name>
<Type>Published</Type>
</Language>
<Language>
<Name>Deutsch</Name>
<Type>Original</Type>
</Language>
</Languages>
<ListPrice>
<Amount>1999</Amount>
<CurrencyCode>EUR</CurrencyCode>
<FormattedPrice>EUR 19,99</FormattedPrice>
</ListPrice>
<Manufacturer>Albrecht Knaus Verlag</Manufacturer>
<NumberOfPages>288</NumberOfPages>
<PackageDimensions>
<Height Units="hundredths-inches">118</Height>
<Length Units="hundredths-inches">858</Length>
<Weight Units="hundredths-pounds">101</Weight>
<Width Units="hundredths-inches">559</Width>
</PackageDimensions>
<ProductGroup>Book</ProductGroup>
<ProductTypeName>ABIS_BOOK</ProductTypeName>
<PublicationDate>2015-02-16</PublicationDate>
<Publisher>Albrecht Knaus Verlag</Publisher>
<Studio>Albrecht Knaus Verlag</Studio>
<Title>Altes Land: Roman</Title>
<TradeInValue>
<Amount>965</Amount>
<CurrencyCode>EUR</CurrencyCode>
<FormattedPrice>EUR 9,65</FormattedPrice>
</TradeInValue>
</ItemAttributes>
<OfferSummary>
<LowestNewPrice>
<Amount>1999</Amount>
<CurrencyCode>EUR</CurrencyCode>
<FormattedPrice>EUR 19,99</FormattedPrice>
</LowestNewPrice>
<LowestUsedPrice>
<Amount>1599</Amount>
<CurrencyCode>EUR</CurrencyCode>
<FormattedPrice>EUR 15,99</FormattedPrice>
</LowestUsedPrice>
<TotalNew>72</TotalNew>
<TotalUsed>8</TotalUsed>
<TotalCollectible>0</TotalCollectible>
<TotalRefurbished>0</TotalRefurbished>
</OfferSummary>
<Offers>
<TotalOffers>1</TotalOffers>
<TotalOfferPages>1</TotalOfferPages>
<MoreOffersUrl>http://www.amazon.de/gp/offer-listing/3813506479%3FSubscriptionId%3DAKIAI554OLCUMRCYB7ZA%26tag%3DjPp08vuSO4osfgfbCbEdF7TNqnWOm7YtprtqRPB9%26linkCode%3Dxm2%26camp%3D2025%26creative%3D12738%26creativeASIN%3D3813506479</MoreOffersUrl>
<Offer>
<OfferAttributes>
<Condition>New</Condition>
</OfferAttributes>
<OfferListing>
<OfferListingId>aeRv5KPt26T8S0hLrgV8Bv9UPYABYOMijGRxffbNJXUZSN4XfeeOZZpCZ28EURzmgMLlcYEBSRlMXS%2F8Z0pN1JbYerndME%2B2VK3RosfdQJA%3D</OfferListingId>
<Price>
<Amount>1999</Amount>
<CurrencyCode>EUR</CurrencyCode>
<FormattedPrice>EUR 19,99</FormattedPrice>
</Price>
<Availability>Gewöhnlich versandfertig in 24 Stunden</Availability>
<AvailabilityAttributes>
<AvailabilityType>now</AvailabilityType>
<MinimumHours>0</MinimumHours>
<MaximumHours>0</MaximumHours>
</AvailabilityAttributes>
<IsEligibleForSuperSaverShipping>1</IsEligibleForSuperSaverShipping>
</OfferListing>
</Offer>
</Offers>
</Item>
</Items>
我想获取任何ASIN元素。所以我尝试了这个：
from lxml import etree
doc = etree.fromstring(xmlstring)
items = doc.xpath('//Items/Item')
for a in items:
asin = a.xpath('//ASIN/text()')
print asin
我得到的是：
['3570102769', '3813506479']
['3570102769', '3813506479']
但是我想要这个：
['3570102769']
['3813506479']
我不明白这是什么问题？我认为我应该遍历任何元素，并且在每个元素中都应包含一个asin项。为什么它返回两次asin？
最佳答案
当您搜索a.xpath('//ASIN/text()')时，您将再次搜索完整的文档树。引用XML Path language specification：
//para选择文档根目录的所有para后代，并因此选择同一文档中的所有para元素作为上下文节点
因此，您要做的是遍历匹配的Item节点并说“请给我本文档中的所有ASIN节点”。此上下文（Item节点）将被忽略。
相反，您应该直接选择ASIN子节点。保留原始的实现，如下所示：
doc = etree.fromstring(xmlstring)
items = doc.xpath('//Items/Item')
for a in items:
asin = a.xpath('ASIN/text()')
print asin
给出您想要的输出：
['3570102769']
['3813506479']
或者，如果不确定
Item在ASIN节点中的什么位置，则可以使用.//ASIN/text()关于python - 如何在Python中解析此XML响应？，我们在Stack Overflow上找到一个类似的问题：https://stackoverflow.com/questions/30163243/