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Objects representing a week

Project description

The isoweek module provide the class Week. Instances represent specific weeks spanning Monday to Sunday. There are 52 or 53 numbered weeks in a year. Week 1 is defined to be the first week with 4 or more days in January.

It’s called isoweek because this is the week definition of ISO 8601. This standard also define a notation for identifying weeks; yyyyWww (where the “W” is a literal). An example is “2011W08” which denotes the 8th week of year 2011. Week instances stringify to this form.

See also

The Week instances are light weight and immutable with an interface similar to the objects. Example code:

from isoweek import Week
w = Week(2011, 20)
print "Week %s starts on %s" % (w, w.monday())

print "Current week number is", Week.thisweek().week
print "Next week is", Week.thisweek() + 1



class isoweek.Week(year, week)

All arguments are required. Arguments should be ints.

If the week number isn’t within the range of the given year, the year is adjusted to make week number within range. The final year must be within range 1 to 9999. If not ValueError is raised.

Other constructors, all class methods:

classmethod Week.thisweek()

Return the current week (local time).

classmethod Week.fromordinal(ordinal)

Return the week corresponding to the proleptic Gregorian ordinal, where January 1 of year 1 starts the week with ordinal 1.

classmethod Week.fromstring(isostring)

Return a week initialized from an ISO formatted string like “2011W08” or “2011-W08”. Note that weeks always stringify back in the former and more compact format.

classmethod Week.withdate(date)

Return the week that contains the given

classmethod Week.weeks_of_year(year)

Return an iterator over the weeks of the given year.

classmethod Week.last_week_of_year(year)

Return the last week of the given year.

Instance attributes (read-only):


Between 1 and 9999 inclusive.


Between 1 and 53 inclusive (52 for most years).

Supported operations:



week1 = week2 + int

week2 is int weeks removed from week1.

week1 = week2 - int

Computes week2 such that week2 + int == week1

int = week1 - week2

Computes int such that week2 + int == week1

week1 < week2

week1 is considered less than week2 when week1 precedes week2 in time.

Instance methods:

Week.replace(year, week)

Return a Week with the same value, except for those parameters given new values by whichever keyword arguments are specified.


Return the proleptic Gregorian ordinal the week, where January 1 of year 1 starts the first week.

Return the given day of week as a object. Day 0 is Monday.

Week.monday(), Week.tuesday(),.. Week.sunday()

Return the given day of week as a object.


Return the 7 days of the week as a list.


Check if the given falls within the week.


Return a string representing the week in ISO 8601 format; “yyyyWww”. For example Week(2011, 8).isoformat() == ‘2011W08’.


For a Week w, str(w) is equivalent to w.isoformat()


Return a string like “isoweek.Week(2011, 2)”.

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