Changed tweets, added eca

demos/average.py

@@ -0,0 +1,47 @@
+from eca import *
+
+
+@event('main')
+def setup(ctx, e):
+    """
+    Initialise the context with an accumulator value, and inform
+    the user about the fact that we process input.
+    """
+    print("Enter a number per line and end with EOF:")
+    print("(EOF is ctrl+d under linux and MacOSes, ctrl+z followed by return under Windows)")
+    ctx.accumulator = 0
+    ctx.count = 0
+
+
+@event('line')
+def line(ctx, e):
+    """
+    Tries to parse the input line as a number and add it to the accumulator.
+    """
+    try:
+        value = float(e.data) if '.' in e.data else int(e.data)
+        ctx.accumulator += value
+        ctx.count += 1
+        print("sum = " + str(ctx.accumulator))
+    except ValueError:
+        print("'{}' is not a number.".format(e.data))
+
+
+@event('end-of-input')
+@condition(lambda c,e: c.count > 0)
+def done(ctx, e):
+    """
+    Outputs the final average to the user.
+    """
+    print("{} samples with average of {}".format(ctx.count, ctx.accumulator / ctx.count))
+    shutdown()
+
+
+@event('end-of-input')
+@condition(lambda c,e: c.count == 0)
+def no_input(ctx, e):
+    """
+    Invoked of no input is given and input is finished.
+    """
+    print("0 samples. \"Does not compute!\"")
+    shutdown()