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yap-6.3/packages/python/examples/tut.pl

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:- use_module(library(python)).
:- initialization(main).
main :-
ex(X),
flush_output,
fail.
main.
%
% strings are atoms in the interface
% with usual properties
%
% variables must be used with $
%
% UNICODE is supposed to work (does in Linux).
%
ex(currency) :-
(
currency := '€',
O := ord($currency),
X := $currency,
L := len($currency),
format('currency=~a ~d/~d~n',[X, O, L])
->
true
;
failed(currency)
).
ex(home) :-
(
filename := os:environ:get('HOME')
->
X := $filename,
format('HOME=~a~n',[X])
;
true
).
ex(site) :-
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X := site:getusersitepackages(_),
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format('site packages=~a~n',[X]).
ex(arith) :-
A := 2+2,
B := (50-5*6)/4,
C := 7/3,
width := 20,
height := 5*9,
D := $width* $height,
format('arith=~d ~d ~d ~d~n',[A,B,C,D]).
ex(undefined) :-
format('undefined variable~n', []),
X := $n,
format('undefined=~d',[X]).
ex(fp) :-
X := 3 * 3.75 / 1.5,
Y := 7.0 / 2,
format('fp=~f ~f~n',[X,Y]).
ex(complex) :-
A := complex(0,1) * complex(0,1),
B := complex(3,1)*3,
a := complex(1.5,0.5),
R := $a:real,
I := $a:imag,
format('complex=~w ~w ~w+~wj~n',[A,B,R,I]).
ex(floatint) :-
A := float(22000),
B := int(3.1),
C := long(15000000.5),
format('cast=~w ~w ~w~n',[A,B,C]).
ex(strings) :-
S1 := 'spam eggs',
S2 := 'doesn\'t',
S3 := '"Yes," he said.',
S4 := '"Isn\'t," she said.',
format('s=~a ~a ~a ~a~n',[S1,S2,S3,S4]),
hello := 'This is a rather long string containing\n\
several lines of text just as you would do in C.\n\
Note that whitespace at the beginning of the line is\
significant.',
python_command('print hello'),
X := $hello,
format('s=~a~n',[X]).
ex(strings2) :-
word := 'Help' + 'A',
X := '<' + $word*5 + '>',
Y := (str:strip) + ing,
A1 := $word^[4],
A2 := $word^[0:2],
A3 := $word^[2:4],
format('concat=~a ~a ~a ~a ~a~n',[X,Y,A1,A2,A3]).
ex(slices) :-
s := 'supercalifragilisticexpialidocious',
L := len($s),
S1 := $s^[1:6],
S2 := $s^[-6: -1],
S3 := $s^[_:6],
S4 := $s^[-6:_],
format('slices=~d ~a ~a ~a ~a~n',[L,S1,S2,S3,S4]).
ex(lists) :-
a := [66.25, 333, 333, 1, 1234.5],
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A1 := $a:count(333), A2 := $a:count(66.25), A3 := $a:count(x),
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format('counts=~d ~d ~d~n',[A1,A2,A3]),
:= $a:insert(2, -1),
:= $a:append(333),
A := $a,
format('a=~w~n', [A]),
I := $a:index(333),
:= $a:remove(333),
B := $a,
format('a=~w~n', [B]),
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:= $a:reverse(_),
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C := $a,
format('a=~w~n', [C]),
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:= $a:sort(_),
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D := $a,
format('a=~w~n', [D]).
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ex(iter) :-
it := iter(abc),
format('iter= ', []),
iterate(iter).
iterate(iter) :-
repeat,
( X1 := $it:next,
format('i ~a~n', [X1])
->
fail
;
!
).
ex(range) :-
r1 := range(1000),
r2 := range(1000,2000),
r3 := range(2000,10000,1),
S := sum($r1+ $r2+ $r3),
format('range=~d~n', [S]).