How to manually install the urllib.parse library.

Create folder /upip and add files upip.py and upip_utarfile.py manually.

Install the library with upip:

%cd /flash/upip
import upip
upip.install("micropython-urllib.parse", "/flash/lib")

To get it working, remove re.py and ffilib.py from lib. Hat-tip to Andreas.

Finally you can encode URL parameters for GET requests:

%cd /flash/lib
import urllib.parse
urllib.parse.urlencode({"a":1, "b": 2})

=> 'a=1&b=2'