add hg and python

1 files changed, 27 insertions, 0 deletions

diff --git a/sys/src/cmd/python/Demo/scripts/primes.py b/sys/src/cmd/python/Demo/scripts/primes.py
new file mode 100755
index 000000000..5935a3c84
--- /dev/null
+++ b/sys/src/cmd/python/Demo/scripts/primes.py
@@ -0,0 +1,27 @@
+#! /usr/bin/env python
+
+# Print prime numbers in a given range
+
+def main():
+    import sys
+    min, max = 2, 0x7fffffff
+    if sys.argv[1:]:
+        min = int(eval(sys.argv[1]))
+        if sys.argv[2:]:
+            max = int(eval(sys.argv[2]))
+    primes(min, max)
+
+def primes(min, max):
+    if 2 >= min: print 2
+    primes = [2]
+    i = 3
+    while i <= max:
+        for p in primes:
+            if i%p == 0 or p*p > i: break
+        if i%p <> 0:
+            primes.append(i)
+            if i >= min: print i
+        i = i+2
+
+if __name__ == "__main__":
+    main()