[pypy-commit] extradoc extradoc: fibo program which depends on refcounting

[antocuni]

Author: Antonio Cuni <anto.cuni at gmail.com>
Branch: extradoc
Changeset: r3739:773f3e49ce7e
Date: 2011-06-19 15:54 +0200
http://bitbucket.org/pypy/extradoc/changeset/773f3e49ce7e/

Log:	fibo program which depends on refcounting

diff --git a/talk/ep2011/training/src/html_fibo.py b/talk/ep2011/training/src/html_fibo.py
new file mode 100644
--- /dev/null
+++ b/talk/ep2011/training/src/html_fibo.py
@@ -0,0 +1,47 @@
+"""
+The most complicate ever way to produce an HTML list of fibonacci numbers
+"""
+
+def fibo():
+    a, b = 1, 1
+    while True:
+        yield a
+        a, b = b, a+b
+
+
+class HtmlTag(object):
+    def __init__(self, f, indent, tag):
+        self.f = f
+        self.tag = tag
+        self.f.write(' ' * indent)
+        self.f.write('<%s>' % tag)
+
+    def __del__(self):
+        self.f.write('</%s>\n' % self.tag)
+
+def html_fibo(f):
+    f.write('<ul>\n')
+    try:
+        for n in fibo():
+            tag = HtmlTag(f, 4, 'li')
+            yield n
+            tag = None
+    finally:
+        tag = None
+        f.write('</ul>\n')
+
+
+def write_file():
+    f = open('fibo.txt', 'w')
+    for n in html<_fibo(f):
+        f.write('%d' % n)
+        if n > 100:
+            break
+
+def main():
+    write_file()
+    content = open('fibo.txt').read()
+    print content
+
+if __name__ == '__main__':
+    main()