PythonCHB
diff --git a/‎week-03/code/StringFormatDemo.py‎
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+# -*- coding: utf-8 -*-
+# <nbformat>3.0</nbformat>
+
+# <codecell>
+
+fp = 3.4
+complex = 3+4j
+
+# <codecell>
+
+print "%f"%(fp)
+
+# <codecell>
+
+print "%f, %f"%(fp, complex)
+
+# <codecell>
+
+print "%f, %f+%fj"%(fp, complex.real, complex.imag)
+
+# <markdowncell>
+
+# But what if you don't know what kind of object you need to format in your string?
+
+# <codecell>
+
+print "%s"%("The string formatter")
+
+# <codecell>
+
+# works for anything...
+"%s, %s"%(fp, complex)
+
+# <markdowncell>
+
+# What it does is call the __str__ method on the object.
+# 
+# There is also "%r" which calls the __repr__ method.
+
+# <codecell>
+
+"%r, %r"%(fp, complex)
+
+# <codecell>
+
+class test(object):
+    def __str__(self):
+        return "This is the ouput of the __str__ method"
+    def __repr__(self):
+        return "This is the ouput of the __repr__ method"
+
+# <codecell>
+
+t = test()
+"%s"%t
+
+# <codecell>
+
+"%r"%t
+
+# <codecell>
+
+