added module and packages tutorial

sdevikar · sdevikar · commit 60ff9ac87edd · 2016-12-06T23:02:00.000-05:00
diff --git a/python2/12a_modules.py b/python2/12a_modules.py
@@ -7,6 +7,7 @@
 
 import urllib
 import mymodule
+import mymodule2
 
 connection = urllib.urlopen("http://www.learnpython.org/en/Modules_and_Packages")
 #print "result = " + str(connection.info())
@@ -16,8 +17,32 @@
 
 # To import the module, just use import command and filename without the extension
 # To use the functions in the module, use <modulename>.<functionname>
+print "Magic number in the module: %d" % mymodule.magic_number
 
 print mymodule.add(3,4)
 print mymodule.subtract(3,4)
 print mymodule.divide(3,4)
 print mymodule.multiply(3,4)
+
+# You can import one module inside the other
+from mymodule2 import average
+
+# mymodule2 loads mymodule. But we'd expect that mymodule is loaded only once.
+# this should NOT print 2
+print "Magic number in the module: %d" % mymodule.magic_number
+
+list = [1,2,5,7,8,10,15, -3]
+x = mymodule2.average(list)
+
+print x
+
+
+# Exercise
+# In this exercise, you will need to print an alphabetically sorted list of all functions in the re module,
+# which contain the word find.
+import re
+
+#import dir
+function_list = dir(re)
+for function in function_list :
+    print function
diff --git a/python2/12b_packages.py b/python2/12b_packages.py
@@ -0,0 +1,14 @@
+# packages are simply directories that can  contain modules and other packages
+# the only secret is that you have to create __init__.py module inside the package directory
+
+# the following works, but requies you to specify package name when calling a function
+import mypackage.p_mymodule
+
+# like this...
+mypackage.p_mymodule.greeting()
+
+
+# the following works too and does not require you to use the package name
+from mypackage import p_mymodule
+
+p_mymodule.greeting()
diff --git a/python2/generators.py b/python2/generators.py
diff --git a/python2/mymodule.py b/python2/mymodule.py
@@ -1,3 +1,7 @@
+
+magic_number = 0
+magic_number += 1
+
 def add(x,y):
     return x+y
 
diff --git a/python2/mymodule2.py b/python2/mymodule2.py
@@ -0,0 +1,8 @@
+import mymodule
+
+def average(list):
+    sum = 0
+
+    for x in list:
+        sum = mymodule.add(sum, x)
+    return sum/len(list)  
diff --git a/python2/mypackage/__init__.py b/python2/mypackage/__init__.py
@@ -0,0 +1 @@
+# This file does not necessarily have to contain any code
diff --git a/python2/mypackage/__init__.pyc b/python2/mypackage/__init__.pyc
diff --git a/python2/mypackage/p_mymodule.py b/python2/mypackage/p_mymodule.py
@@ -0,0 +1,3 @@
+
+def greeting() :
+    print "hello there!"
diff --git a/python2/mypackage/p_mymodule.pyc b/python2/mypackage/p_mymodule.pyc

Original file line number	Diff line number	Diff line change
`@@ -0,0 +1 @@`
	`1`	`+# This file does not necessarily have to contain any code`
Original file line number	Diff line number	Diff line change
`@@ -0,0 +1,3 @@`
	`1`	`+`
	`2`	`+def greeting() :`
	`3`	`+ print "hello there!"`