1 files changed, 49 insertions, 0 deletions
diff --git a/AppPkg/Applications/Python/Python-2.7.2/Demo/scripts/fact.py b/AppPkg/Applications/Python/Python-2.7.2/Demo/scripts/fact.py
new file mode 100644
index 0000000000..2068c85bdc
--- /dev/null
+++ b/AppPkg/Applications/Python/Python-2.7.2/Demo/scripts/fact.py
@@ -0,0 +1,49 @@
+#! /usr/bin/env python
+
+# Factorize numbers.
+# The algorithm is not efficient, but easy to understand.
+# If there are large factors, it will take forever to find them,
+# because we try all odd numbers between 3 and sqrt(n)...
+
+import sys
+from math import sqrt
+
+def fact(n):
+    if n < 1:
+        raise ValueError('fact() argument should be >= 1')
+    if n == 1:
+        return []  # special case
+    res = []
+    # Treat even factors special, so we can use i += 2 later
+    while n % 2 == 0:
+        res.append(2)
+        n //= 2
+    # Try odd numbers up to sqrt(n)
+    limit = sqrt(n+1)
+    i = 3
+    while i <= limit:
+        if n % i == 0:
+            res.append(i)
+            n //= i
+            limit = sqrt(n+1)
+        else:
+            i += 2
+    if n != 1:
+        res.append(n)
+    return res
+
+def main():
+    if len(sys.argv) > 1:
+        source = sys.argv[1:]
+    else:
+        source = iter(raw_input, '')
+    for arg in source:
+        try:
+            n = int(arg)
+        except ValueError:
+            print arg, 'is not an integer'
+        else:
+            print n, fact(n)
+
+if __name__ == "__main__":
+    main()