There is one instance for each circle-year.
.lat
, .lon
These two fields are the composite key used to relate a circle-year to a circle.
.year_no
The year number as a string of three digits with
left zero fill, e.g., “008
”. See Section 3.3, “Year number”.
.year_key
The year key for this circle-year, left-justified and
blank-filled to length 5. S see the discussion of the
year_key
attribute in Section 4.1.7, “Attributes of the efforts
table”. Example values (where
_
represents a space):
0001_ 0027_ 0027b NMZU_
.yyyymmdd
Date as a datetime.date
object.
.n_obs
Number of observers as an int
.
.ph_tot
, .ph_foot
,
.ph_car
, .ph_other
,
.h_fd
, .h_owl
, .pm_tot
, .pm_foot
, .pm_car
, .pm_other
, and .m_owl
All these hour- and mile-based quantities use
Python's decimal.Decimal
type, with
a precision of one digit after the decimal point.
Note that quantities in this type can be formatted
using a “%f
” format,
as in this conversational example.
>>> d1=decimal.Decimal('1.4') >>> d2=decimal.Decimal('3.47') >>> d3=d1+d2 >>> d3 Decimal('4.87') >>> "%6.1f" % d3 ' 4.9' >>> "%6.3f" % d3 ' 4.870'
.circle
The Circle
instance for to this
circle-year.
.censuses
An iterator that produces all the Census
instances for this circle-year.