Marcelo

#!/usr/local/bin/python


#### Some function manipulation tools
class NoResult:
    pass


def apply(f, x):
    if x is NoResult:
        return NoResult
    try:
        if hasattr(f, '__call__'):
            return f(x)
        elif type(f) == type([]):
            for f_i in f:
                x = apply(f_i, x)
            return x
        elif type(f) == type((1,)):
            assert(len(f) == len(x))
            ret = tuple([apply(f[i], x[i]) for i in range(len(f))])
            if NoResult in ret:
                return NoResult
            else:
                return ret
        else:
            return NoResult
    except AssertionError:
        return NoResult

#### Some domain-specific functions

def stripped(x):
    return x.strip()

def split(sep):
    def f(x):
        return x.split(sep)
    return f

def capitalized(x):
    return x.capitalize()

if __name__ == '__main__':
    DATA = """A,1,marcelo
B,3,paul
"""

    import StringIO
    datafile = StringIO.StringIO(DATA)

    dataparser = [ stripped, split(','), (str, int, capitalized) ]
    for line in datafile:
        print apply(dataparser, line)