Hello

please try with below code:

from operator import itemgetter
list_to_be_sorted = [{'id':'1', 'date':'2019-05-01'},{'id':'2', 'date':'2018-01-01'},{'id':'3', 'date':'2019-01-01'}]
newlist = sorted(list_to_be_sorted, key=itemgetter('date'))
print newlist

In QWeb Report you can order them like in Python code:

 <tr t-foreach="docs.sorted(key=lambda x: x.date)" t-as="item">

    ...

</tr>

With expression:
OrderedDict(sorted(Lines[o.id][currency].items(), key=lambda t: t[0]))

The error is:
AttributeError: 'list' object has no attribute 'items'

With expression:
Lines[o.id][currency].sorted(key=lambda b: b[0])

The error is:
AttributeError: 'list' object has no attribute 'sorted'

Try this:

ordered = OrderedDict(sorted(mydict.items(), key=lambda t: t[0]))