Can someone explain this code to me?

Question

def dayofweek(d, m, y):
t = [ 0, 3, 2, 5, 0, 3, 5, 1, 4, 6, 2, 4 ]
y -= m < 3
return (( y + int(y / 4) - int(y / 100) + int(y / 400) + t[m-1] +d) %7)
day = dayofweek (8, 12, 2018)
print (day)

What do the indented lines mean?

Answer 1

No. It's not a function.
't' is just an arbitrary variable and 't= [........]' means you're just assigning a list to the variable 't'

Answer 2

It'd be better to help if you can write this code in the playground and share it's link over here.
It's python and it works on indentation the same way other languages work on '{...}'.
In Python, indentation is the space left in front of every line of code. Every line should have same indentation, means same number of spaces should be left in front of every line with respect to it's above line or else there'll be a syntax error.

Answer 3

y -= m < 3
is the same as:
if m < 3:
y = y - 1

For the leap years the function adds an extra '1' to the result, but for Jan and Feb it is must not be done. So there is a correction for first and second months.

Answer 4

If the year isn't bissextile it contains 365 days. Also we have 7 days in a week. 365 = 52 * 7 + 1. So the remainder of the division of 365 by 7 is 1 (365 % 7 == 1). This means that for a given date every non-leap year shifts the day of the week by one. For instance:
2017-12-09 - Saturday
2018-12-09 - Sunday
2019-12-09 - Monday
So for non-leap years we can calculate the number of the day of the week as:
(y + C) % 7
Where y is number of the year and C is number of the days from 1 of the January to the given date. As every month of the non-leap year contains certain number of the days, the day of the week can be calculated as:
(y + T + d) % 7,
where T depends of the number of the month.
t = [ 0, 3, 2, 5, 0, 3, 5, 1, 4, 6, 2, 4 ] is the list of this values

int(y / 4) - int(y / 100) + int(y / 400) is the correction for the leap year.

https://en.m.wikipedia.org/wiki/Leap_year

Answer 5

https://code.sololearn.com/chy8aqpV0veY/?ref=app
what does ‘t=‘ function mean? ‘table?’

Answer 6

thank you. what do the other two lines mean?