class_docstr: Expression
  
  Base object for enabling build-up of Javascript expressions using
  a Python syntax. Calling ``repr(obj)`` will return a Javascript
  representation of the object and the operations it encodes.
class_docstr_tok: ["Expression","Base","object","for","enabling","build-up","of","Javascript","expressions","using","a","Python","syntax",".","Calling","``","repr","(","obj",")","``","will","return","a","Javascript","representation","of","the","object","and","the","operations","it","encodes","."]
code: def __getitem__(self, val):
      return GetItemExpression(self, val)
  
imports: from ..utils import SchemaBase
label_desc: Use image node_id 3 for calling the Expression obj's underlying member method code with example usage: obj.__getitem__(val) and returns: GetItemExpression