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8.4 Expression input

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.