I would go for Python's urllib, it's a built-in library.
# Python 2:
import urllib
# Python 3:
# import urllib.parse
getVars = {'var1': 'some_data', 'var2': 1337}
url = 'http://domain.com/somepage/?'
# Python 2:
print(url + urllib.urlencode(getVars))
# Python 3:
# print(url + urllib.parse.urlencode(getVars))
Output:
http://domain.com/somepage/?var2=1337&var1=some_data