There are two forms of expression input. Both ignore leading whitespace. The string argument to eval() must have the following form:
eval_input: expression_list NEWLINE*
The input line read by input() must have the following form:
input_input: expression_list NEWLINE
Note: to read `raw' input line without interpretation, you can use the built-in function raw_input() or the readline() method of file objects.
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