Github user HyukjinKwon commented on the issue: https://github.com/apache/spark/pull/17160 **without `__contains__`, `__nonzero__` and `__bool__`** ```python class Column(object): pass >>> 1 in Column() Traceback (most recent call last): File "<stdin>", line 1, in <module> TypeError: argument of type 'Column' is not iterable >>> bool(Column()) True ``` **without `__nonzero__` and `__bool__`** ```python class Column(object): def __contains__(self, item): print "I am contains" return Column() >>> 1 in Column() I am contains True >>> bool(Column()) True ``` **without `__contains__`** ```python class Column(object): def __nonzero__(self): print "I am nonzero" return Column() >>> 1 in Column() Traceback (most recent call last): File "<stdin>", line 1, in <module> TypeError: argument of type 'Column' is not iterable >>> bool(Column()) I am nonzero Traceback (most recent call last): File "<stdin>", line 1, in <module> TypeError: __nonzero__ should return bool or int, returned Column ```
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