以下是使用Python遍历Foursquare API返回的JSON数据的示例代码：

import requests
import json

# 发送GET请求获取Foursquare API的JSON数据
url = 'https://api.foursquare.com/v2/venues/explore'
params = {
    'client_id': 'YOUR_CLIENT_ID',
    'client_secret': 'YOUR_CLIENT_SECRET',
    'v': '20220101',
    'll': '40.7128,-74.0060',
    'query': 'restaurant'
}
response = requests.get(url, params=params)
data = response.json()

# 遍历JSON数据
for item in data['response']['groups'][0]['items']:
    venue = item['venue']
    name = venue['name']
    location = venue['location']
    address = location.get('address', '')
    city = location.get('city', '')
    state = location.get('state', '')
    country = location.get('country', '')
    print(f"Name: {name}")
    print(f"Address: {address}")
    print(f"City: {city}")
    print(f"State: {state}")
    print(f"Country: {country}")
    print('---')

请注意，在使用此示例代码之前，您需要替换YOUR_CLIENT_ID和YOUR_CLIENT_SECRET为您自己的Foursquare API凭据。此示例代码将获取在纽约市附近的餐厅，并打印出每个餐厅的名称、地址、城市、州和国家信息。

此示例代码假设Foursquare API的响应JSON数据结构类似于以下示例：

{
  "response": {
    "groups": [
      {
        "items": [
          {
            "venue": {
              "name": "Restaurant 1",
              "location": {
                "address": "123 Main St",
                "city": "New York",
                "state": "NY",
                "country": "USA"
              }
            }
          },
          {
            "venue": {
              "name": "Restaurant 2",
              "location": {
                "address": "456 Elm St",
                "city": "New York",
                "state": "NY",
                "country": "USA"
              }
            }
          },
          ...
        ]
      }
    ]
  }
}

您可以根据实际的Foursquare API响应数据结构进行相应的修改和调整。