Predeclared in MCE

Below you find all constants and functions used in the textbook Structure and Interpretation of Computer Programs, Python Adaptation (SICPy). These constants and functions are predeclared in the language Python ยง4, a Python sublanguage implemented in the Source Academy.

Can I use these constants and functions without the Source Academy ?

Yes, these constants and functions are provided by the PyPI package sourceacademy-sicp. You can use this package to run the Python programs of SICPy in any system that implements Python. Follow the link for installation instructions.

Functions

apply_in_underlying_python(f, xs) → {value}

calls the function f with arguments given in linked list xs. For example: 
def times(x, y):
    return x * y

apply_in_underlying_python(times, list(2, 3)); # returns 6
Parameters:
Name Type Description
f function function to be applied
xs linked_list arguments given in list
Returns:
whatever f returns
Type
value

parse(x) → {value}

returns the parse tree that results from parsing the string str as a Python program. The format of the parse tree is described in chapter 4 of the textbook in Structure and Interpretation of Computer Programs, Python Adaptation (SICPy).
Parameters:
Name Type Description
x str given program as a string
Returns:
parse tree
Type
value

tokenize(s) → {linked_list}

returns the list of tokens that results from lexing the string s
Parameters:
Name Type Description
s str given program as a string
Returns:
linked list of tokens
Type
linked_list