title: How to check if a value exists in JSON array and continue loop
body: <p>So I am using a for loop to determine if a specific key exists in a array. But so far every method I tried didn't work for what I am trying to accomplish.</p>
  
  <p>My code looks as follow:</p>
  
  <pre><code>for i in range(1,len(opslag)):
       info_product = 'https://examplesite.com/'+str(opslag[i])+'.json'
       info_get = session.get(info_product)
       text_info_prdt = info_get.text
       json_info_prdt =json.loads(text_info_prdt)
       if json_info_prdt['product']['metafields']['meta_title_nl'] in json_info_prdt['product']['metafields']:
          print(json_info_prdt['product']['metafields']['meta_title_nl'])
       else:
           print(json_info_prdt['product']['id'])
  </code></pre>
  
  <p>So the value in this case <code>json_info_prdt['product']['metafields']['meta_title_nl']</code> , doesn't exist in every array I am trying to loop through. So sometimes the if else statement will work, and the value will be printed. But sometimes the value <code>json_info_prdt['product']['metafields']['meta_title_nl']</code> doesn't exist at all and gives me a <code>KeyError</code>.</p>
  
  <p>So What I want to do is to get all the ID's of the products that return a <code>KeyError</code> but I don't want the loop to stop but to continue till it's finished. So I also don't want the loop to restart itself because that's pointless. </p>
  
  <p>My JSON looks as follow: </p>
  
  <pre><code>{
     product:{
        article_code:"",
        barcode:"",
        brand_id:null,
        created_at:"2017-07-07T12:49:23+02:00",
        data01:"",
        data02:"",
        data03:"",
        delivery_date_id:null,
        has_custom_fields:true,
        has_discounts:false,
        has_matrix:false,
        hits:0,
        hs_code:null,
        id:52847777,
        image_id:130661048,
        is_visible:true,
        price_excl:0,
        price_incl:0,
        price_old_excl:0,
        price_old_incl:0,
        product_set_id:383078,
        product_type_id:null,
        search_context:"",
        shop_id:240359,
        sku:"",
        supplier_id:null,
        updated_at:"2018-07-10T10:53:15+02:00",
        variants_count:4,
        visibility:"visible",
        weight:0,
        custom_fields:[
  
        ],
        variants:[
  
        ],
        product_relations:[
  
        ],
        product_categories:[
  
        ],
        product_discounts:[
  
        ],
        product_type:null,
        product_filter_values:[
  
        ],
        product_bundles:[
  
        ],
        metafields:{
           meta_title_nl:"Big House",
           meta_title_en:"cxzcxzcxz",
           meta_description_nl:"This is a big house"
        },
        supplier:null,
        product_images:[
  
        ],
        brand:null,
        delivery_date:null,
        image:{
  
        },
        nl:{
  
        },
        en:{
  
        },
        tags:null
     }
  }
  </code></pre>
  
  <p>As you can see the value <code>meta_title_nl</code> exists in this one, but sometimes it doesn't exist. </p>