擅长:python、mysql、java
<p>让<code>requests</code>为您组装URL。你知道吗</p>
<pre><code>common_params = {
"max": maxrec,
"type": item,
"freq": freq,
# etc
}
for year in range(1991,2018):
response = requests.get(base, params=dict(common_params, ps=str(year))
response_data = response.json()
new = pd.DataFrame(response_data["dataset"])
comtrade = comtrade.append(new)
</code></pre>