无法使用python脚本在字典中输入字符

Question

我在python中通过检索json格式的数据制作了一个字典。

[{"id":"1","kingdom":"Metazoa ","phylum":"Arthropoda ","class":"Insecta ","order":"Hemiptera ","family":"Belostomatidae ","genus":"Abedus"},<br>
{"id":"2","kingdom":"Viridiplantae ","phylum":"Streptophyta ","class":"unclassified_Streptophyta ","order":"Pinales ","family":"Pinaceae ","genus":"Abies"}]

当我访问数据时，我试图只获取 genus 的值为 Abies 的数据，但我得到了错误

ValueError : 以 10 为底的 int ( ) 的无效文字：'Abies'

但是如果我输入一个数值，我会得到对应于json的“id”的数据。

这是我的脚本：

import urllib2
import simplejson

title = raw_input("find taxonom: ")
print "key: ",title 

response = urllib2.urlopen("http://localhost/csv/taxo.json")
data = simplejson.load(response)
get = int(str(title))
print data[get]

如何让它显示与属输入匹配的每个数据的“id”、“kingdom”、“phlyum”、“class”等？

Answer 1

您遇到的错误是因为您试图将包含非数值的字符串转换为整数。要解决此问题，请删除 get = int(str(title))

---

您拥有的数据是一个列表。列表使用数字索引来访问列表中不同位置的元素。要打印genus 值，您必须这样做：

print data[1]['genus']

请注意，这针对列表中的第二个字典。要为第一个字典打印 genus 的值，您必须将 1 更改为 0

---

要打印包含genus 匹配标题值的每个字典的值，请执行以下操作：

for attr_map in data:
    if attr_map['genus'] == title:
        print attr_map

程序运行示例：

>>> import json
>>> buffer = '[{"id":"1","kingdom":"Metazoa ","phylum":"Arthropoda ","class":"Insecta ","order":"Hemiptera ","family":"Belostomatidae ","genus":"Abedus"},{"id":"2","kingdom":"Viridiplantae ","phylum":"Streptophyta ","class":"unclassified_Streptophyta ","order":"Pinales ","family":"Pinaceae ","genus":"Abies"}]'
>>> data = json.loads(buffer)
>>> data
[{u'kingdom': u'Metazoa ', u'family': u'Belostomatidae ', u'class': u'Insecta ', u'id': u'1', u'phylum': u'Arthropoda ', u'genus': u'Abedus', u'order': u'Hemiptera '}, {u'kingdom': u'Viridiplantae ', u'family': u'Pinaceae ', u'class': u'unclassified_Streptophyta ', u'id': u'2', u'phylum': u'Streptophyta ', u'genus': u'Abies', u'order': u'Pinales '}]
>>>
>>> title = raw_input("find taxonom: ")
find taxonom: Abies
>>> for attr_map in data:
...     if attr_map['genus'] == title:
...         print attr_map
... 
{u'kingdom': u'Viridiplantae ', u'family': u'Pinaceae ', u'class': u'unclassified_Streptophyta ', u'id': u'2', u'phylum': u'Streptophyta ', u'genus': u'Abies', u'order': u'Pinales '}

Answer 2

这将找到第一个匹配的条目：

print next(x for x in data if x["genus"] == title)