無法在字典中使用python腳本輸入字符

Question

我通過檢索json格式的數據在python中創建了一本字典。

[{"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"}] 

當我訪問這些數據，我想只拿這樣的，其中的genus值爲Abies，而是我得到的錯誤

ValueError : invalid literal for int () with base 10 : 'Abies'

但是，如果我輸入一個數值，我得到的數據對應於json的「id」。

這是我的腳本：

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] 

我如何得到它顯示的數據「ID」，「王國」，每一個爲屬匹配輸入數據的「phlyum」，「階級」，等等？

Answer 1

你得到的錯誤是因爲你試圖將包含非數值的字符串轉換爲整數。要解決此問題，請刪除get = int(str(title))

---

您擁有的數據是一個列表。列表使用數字索引來訪問列表中不同位置的元素。要打印genus值，你要做的：

print data[1]['genus'] 

注意，這個目標在列表中的第二個字典。要打印的genus值第一個字典，你必須改變1到0

---

要打印其中包含genus匹配標題值每個字典的值，這樣做：

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

程序的運行示例：

>>> 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

這將找到相匹配的第一個條目：

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