cbchistlib.py

# - - - d i v C e i l def divCeil(n, d): '''Computes the number of multiples of d necessary to hold n. [ (n is a nonnegative integer) and (d is a positive integer) -> return int(ceil(float(n)/float(d))) ] '''

This function represents one of the author's oldest bits of
programming practice: how many multiples of `d`

are
necessary to hold `n`

things? For example, if we
are placing `n`

radiobuttons in a table of `d`

columns, how many rows are there? The method is to
add `d-1`

to `n`

and then use integer
arithmetic to divide by `d`

.

cbchistlib.py

return (n+d-1) // d

The Python “`//`

” operator is
integer divide; in future Python versions the “`/`

” operator will actually return the quotient
as a float.