one Liner: Lisprint(x) --> (a, b, c) instead of ['a', 'b', 'c']

[avi.e.gross at gmail.com]

I so rarely need to save a list in python in a form acceptable to LISP but here is a go with no visible recursion needed.

>>> nested = [1, 2, [3, 4, [5, 6, 7], 8], 9]

>>> print(nested)
[1, 2, [3, 4, [5, 6, 7], 8], 9]

# Just converting to a tuple does not change nested lists
>>> print(tuple(nested))
(1, 2, [3, 4, [5, 6, 7], 8], 9)

# But a function that typographically replaces [] with () needs no recursion
>>> def p2b(nested_list): return repr(nested_list).replace('[','(').replace(']',')')

>>> print(p2b(nested))
(1, 2, (3, 4, (5, 6, 7), 8), 9)

People who speak python well do not necessarily lisp.

-----Original Message-----
From: Python-list <python-list-bounces+avi.e.gross=gmail.com at python.org> On Behalf Of Hen Hanna
Sent: Sunday, February 26, 2023 4:54 AM
To: python-list at python.org
Subject: Re: one Liner: Lisprint(x) --> (a, b, c) instead of ['a', 'b', 'c']

On Saturday, February 25, 2023 at 11:45:12 PM UTC-8, Hen Hanna wrote:
> def Lisprint(x): print( ' (' + ', '.join(x) + ')' , '\n') 
> 
> a= ' a b c ? def f x if zero? x 0 1 ' 
> a += ' A B C ! just an example ' 
> x= a.split() 
> 
> print(x) 
> Lisprint(x) 
> 
> ['a', 'b', 'c', '?', 'def', 'f', 'x', 'if', 'zero?', 'x', '0', '1', 'A', 'B', 'C', '!', 'just', 'an', 'example'] 
> 
> (a, b, c, ?, def, f, x, if, zero?, x, 0, 1, A, B, C, !, just, an, example)


For nested lists....          impossible to improve   upon  P.Norvig's  code


def Lisprint(x):           print(lispstr(x))

def lispstr(exp):
    "Convert a Python object back into a Lisp-readable string."
    if isinstance(exp, list):
        return '(' + ' '.join(map(lispstr, exp)) + ')' 
    else:
        return str(exp)

a=    ' a b c '
x= a.split()
x +=  [['a', 'b', 'c']]
x +=  x

print(x) 
Lisprint(x) 

['a', 'b', 'c', ['a', 'b', 'c'], 'a', 'b', 'c', ['a', 'b', 'c']]

(a b c (a b c) a b c (a b c))


              ----------   Without the commas,   the visual difference (concision)  is  striking !
-- 
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