Method find

IPython/core/inputtransformer2.py:247–263

Find the first system assignment (a = !foo) in the cell.

(cls, tokens_by_line)

    """Transformer for assignments from system commands (a = !foo)"""
    @classmethod
    def find(cls, tokens_by_line):
        """Find the first system assignment (a = !foo) in the cell.
        """
        for line in tokens_by_line:
            assign_ix = _find_assign_op(line)
            if (assign_ix is not None) \
                    and not line[assign_ix].line.strip().startswith('=') \
                    and (len(line) >= assign_ix + 2) \
                    and (line[assign_ix + 1].type == tokenize.ERRORTOKEN):
                ix = assign_ix + 1

                while ix < len(line) and line[ix].type == tokenize.ERRORTOKEN:
                    if line[ix].string == '!':
                        return cls(line[ix].start)
                    elif not line[ix].string.isspace():
                        break
                    ix += 1

    def transform(self, lines: List[str]):
        """Transform a system assignment found by the ``find()`` classmethod.