Convert DD (decimal degrees) to DMS (degrees minutes seconds) in Python?

Question

How do you convert Decimal Degrees to Degrees Minutes Seconds In Python? Is there a Formula already written?

Answer 1

This is exactly what divmod was invented for:

def decdeg2dms(dd):
    mult = -1 if dd < 0 else 1
    mnt,sec = divmod(abs(dd)*3600, 60)
    deg,mnt = divmod(mnt, 60)
    return mult*deg, mult*mnt, mult*sec

dd = 45 + 30/60 + 1/3600
print(decdeg2dms(dd))

# negative value returns all negative elements
print(decdeg2dms(-122.442))

Prints:

(45.0, 30.0, 1.0)
(-122.0, -26.0, -31.199999999953434)

Answer 2

Here is my updated version based upon Paul McGuire's. This one should handle negatives correctly.

def decdeg2dms(dd):
   is_positive = dd >= 0
   dd = abs(dd)
   minutes,seconds = divmod(dd*3600,60)
   degrees,minutes = divmod(minutes,60)
   degrees = degrees if is_positive else -degrees
   return (degrees,minutes,seconds)

Answer 3

If you want to handle negatives properly, the first non-zero measure is set negative. It is counter to common practice to specify all of degrees, minutes and seconds as negative (Wikipedia shows 40° 26.7717, -79° 56.93172 as a valid example of degrees-minutes notation, in which degrees are negative and minutes have no sign), and setting degrees as negative does not have any effect if the degrees portion is 0. Here is a function that adequately handles this, based on Paul McGuire's and baens' functions:

def decdeg2dms(dd):
    negative = dd < 0
    dd = abs(dd)
    minutes,seconds = divmod(dd*3600,60)
    degrees,minutes = divmod(minutes,60)
    if negative:
        if degrees > 0:
            degrees = -degrees
        elif minutes > 0:
            minutes = -minutes
        else:
            seconds = -seconds
    return (degrees,minutes,seconds)