Python 的下载可以从官网下载：https://www.python.org//。也可以使用以下代码来下载：
Python 3 的下载可以从官网下载：https://www.python.org/downloads/。
也可以使用以下代码来下载：
import os
# Python 3.x
url = 'https://www.python.org/ftp/python/3.8.2/python-3.8.2.exe'
# Download the file from `url` and save it locally under `file_name`:
file_name = url.split('/')[-1]
if not os.path.exists(file_name):
with open(file_name, 'wb') as f:
response = requests.get(url, stream=True)
total_length = response.headers.get('content-length')
if total_length is None: # no content length header
f.write(response.content)
else:
dl = 0
total_length = int(total_length)
for data in response.iter_content(chunk_size=4096):
dl += len(data)
f.write(data)
done = int(50 * dl / total_length)
sys.stdout.write("\r[%s%s]" % ('=' * done, ' ' * (50-done))
sys.stdout.flush()
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