get all data from fields in a WTForm as dict

all-fields-wtforms-as-dict.py

"""
It took me hours to figure out that iterating over fields
in a WTForm has unintuitive behaviour if you use `continue`
"""


# This works as expected
for field in form._fields:
    data[field] = form._fields[field].data
del data["csrf_token"]
del data["submit"]


# This doesn't work as expected
for field in form._fields:
    if field in ("csrf_token", "submit"):
        continue
    data[field] = form._fields[field].data