#!/env/python
# coding=utf8

"""
Converting Degrees, Minutes, Seconds formatted coordinate strings to decimal. 

Formula:
DEC = (DEG + (MIN * 1/60) + (SEC * 1/60 * 1/60))

Assumes S/W are negative. 
"""

import re

def dms2dec(dms_str):
    """Return decimal representation of DMS
    
    >>> dms2dec('''48°53'10.18"N''')
    48.8866111111F
    
    >>> dms2dec('''(2°20'35.09"E''')
    2.34330555556F
    
    >>> dms2dec('''48°53'10.18"S''')
    -48.8866111111F
    
    >>> dms2dec('''(2°20'35.09"W''')
    -2.34330555556F
    
    """
    
    dms_str = re.sub(r'\s', '', dms_str)
    
    sign = -1 if re.search('[swSW]', dms_str) else 1
    
    numbers = [*filter(len, re.split('\D+', dms_str, maxsplit=4))]

    degree = numbers[0]
    minute = numbers[1] if len(numbers) >= 2 else '0'
    second = numbers[2] if len(numbers) >= 3 else '0'
    frac_seconds = numbers[3] if len(numbers) >= 4 else '0'
    
    second += "." + frac_seconds
    return sign * (int(degree) + float(minute) / 60 + float(second) / 3600)

def ddm2dec(dms_str):
    """Return decimal representation of DDM (degree decimal minutes)
    
    >>> ddm2dec("45° 17,896' N")
    48.8866111111F
    """
    
    dms_str = re.sub(r'\s', '', dms_str)
    
    sign = -1 if re.search('[swSW]', dms_str) else 1
    
    numbers = [*filter(len, re.split('\D+', dms_str, maxsplit=4))]

    degree = numbers[0]
    minute_decimal = numbers[1] 
    decimal_val = numbers[2] if len(numbers) > 2 else '0' 
    minute_decimal += "." + decimal_val

    return sign * (int(degree) + float(minute_decimal) / 60)

print(ddm2dec("45° 17,896' N"))