def append(self, cmd, kind):
        """t.append(cmd, kind) adds a new step at the end."""
        if type(cmd) is not type(''):
            raise TypeError, \
                  'Template.append: cmd must be a string'
        if kind not in stepkinds:
            raise ValueError, \
                  'Template.append: bad kind %r' % (kind,)
        if kind == SOURCE:
            raise ValueError, \
                  'Template.append: SOURCE can only be prepended'
        if self.steps and self.steps[-1][1] == SINK:
            raise ValueError, \
                  'Template.append: already ends with SINK'
        if kind[0] == 'f' and not re.search(r'\$IN\b', cmd):
            raise ValueError, \
                  'Template.append: missing $IN in cmd'
        if kind[1] == 'f' and not re.search(r'\$OUT\b', cmd):
            raise ValueError, \
                  'Template.append: missing $OUT in cmd'
        self.steps.append((cmd, kind))
dataset/ETHPy150Open azoft-dev-team/imagrium/env/Lib/pipes.py/Template.append/original