some more snippets to post on the discussion forum

zingale · zingale · commit 7bfbb6b8273c · 2015-03-02T18:33:22.000-05:00
diff --git a/examples/python-snippets/functionfunction.post b/examples/python-snippets/functionfunction.post
@@ -0,0 +1,25 @@
+Python functions are objects too.  Here's an example of passing a
+function to a function.  There's a other things to note here:
+
+1. we use sys.exit() to abort if no function is supplied to execute()
+
+2. we can use the "{}" syntax we saw with print in normal strings too.
+
+
+import sys
+
+def execute(x, function=None):
+    if function == None:
+            sys.exit("ERROR: no function supplied")
+
+    return function(x)
+
+
+def test_function(x):
+    a = "you passed in {}".format(x)
+        return a
+
+
+print execute("test", function=test_function)
+
+
diff --git a/examples/python-snippets/in.post b/examples/python-snippets/in.post
@@ -0,0 +1,13 @@
+We say the "in" operator in class to loop over members of a list, e.g.:
+
+for a in [0, 1, 2, 3]:
+    ...
+
+but in can also be used to test if a string contains a substring:
+
+
+>>> mystring = "this is my string"
+>>> "this" in mystring
+True
+>>> "that" in mystring
+False
diff --git a/examples/python-snippets/zip.post b/examples/python-snippets/zip.post
@@ -0,0 +1,20 @@
+Here's another simple example that shows how to use zip() to merge two
+lists, element by element into a list of tuples, and how to use the
+".split()" method on a string to split it into its component words:
+
+>>> a = range(10)
+>>> print a
+[0, 1, 2, 3, 4, 5, 6, 7, 8, 9]
+>>> b = "this is my nice long string".split()
+>>> print b
+['this', 'is', 'my', 'nice', 'long', 'string']
+>>> for n, w in zip(a, b):
+   ....:     print n, w
+   ....:
+0 this
+1 is
+2 my
+3 nice
+4 long
+5 string
+      
