Added module

fengsp · fengsp · commit 83bd6cb3cc5b · 2014-07-11T23:15:03.000+08:00
diff --git a/docs/basic.rst b/docs/basic.rst
@@ -4,6 +4,15 @@ Basic
 Snippets on basic things.
 
 
+not None test
+-------------
+
+::
+    
+    if value is not None:
+        pass
+
+
 `ternary conditional operator`_
 -------------------------------
 
@@ -24,5 +33,25 @@ Snippets on basic things.
         print idx, val
 
 
+`how do I check if a variable exists`_
+--------------------------------------
+
+To check the existence of a local variable::
+
+    if 'myVar' in locals():
+        # myVar exists.
+
+To check the existence of a global variable::
+
+    if 'myVar' in globals():
+        # myVar exists.
+
+To check if an object has an attribute::
+
+    if hasattr(obj, 'attr_name'):
+        # obj.attr_name exists.
+
+
 .. _ternary conditional operator: http://stackoverflow.com/questions/394809/does-python-have-a-ternary-conditional-operator
 .. _accessing the index in for loops: http://stackoverflow.com/questions/522563/accessing-the-index-in-python-for-loops
+.. _how do I check if a variable exists: http://stackoverflow.com/questions/843277/how-do-i-check-if-a-variable-exists-in-python
diff --git a/docs/file.rst b/docs/file.rst
@@ -1,7 +1,7 @@
 File
 ====
 
-Snippets about files manipulation.
+Snippets about files and folders manipulation.
 
 
 `check if file exists`_
@@ -32,6 +32,38 @@ It is easier to use the open method from the codecs module::
     filename, ext = os.path.splitext('/path/to/somefile.ext')
 
 
+`get file creation & modification date/times`_
+----------------------------------------------
+
+ctime() does not refer to creation time on `*nix` systems, but rather the last
+time the inode data changed::
+    
+    import os.path, time
+    print "last modified: %s" % time.ctime(os.path.getmtime(file))
+    print "created: %s" % time.ctime(os.path.getctime(file))
+
+
+`find current directory and file's directory`_
+----------------------------------------------
+
+::
+    os.getcwd()
+    os.path.dirname(os.path.realpath(__file__))
+
+
+`remove/delete a folder that is not empty`_
+-------------------------------------------
+
+::
+    
+    import shutil
+
+    shutil.rmtree('/folder_name')
+
+
 .. _check if file exists: http://stackoverflow.com/questions/82831/how-do-i-check-if-a-file-exists-using-python
 .. _unicode (utf8) reading and writing to files: http://stackoverflow.com/questions/491921/unicode-utf8-reading-and-writing-to-files-in-python
 .. _extracting extension from filename: http://stackoverflow.com/questions/541390/extracting-extension-from-filename-in-python
+.. _remove/delete a folder that is not empty: http://stackoverflow.com/questions/303200/how-do-i-remove-delete-a-folder-that-is-not-empty-with-python
+.. _get file creation & modification date/times: http://stackoverflow.com/questions/237079/how-to-get-file-creation-modification-date-times-in-python
+.. _find current directory and file's directory: http://stackoverflow.com/questions/5137497/find-current-directory-and-files-directory
diff --git a/docs/index.rst b/docs/index.rst
@@ -20,6 +20,7 @@ Overflow, others are written by me or taken from various web resources.
    method
    metaclass
    performance
+   module
    io
    file
    email
diff --git a/docs/module.rst b/docs/module.rst
@@ -0,0 +1,18 @@
+Module
+======
+
+Snippets on packages and modules.
+
+
+get all module files
+--------------------
+
+::
+    
+    def _iter_module_files():
+        for module in sys.modules.values():
+            filename = getattr(module, '__file__', None)
+            if filename:
+                if filename[-4:] in ('.pyc', '.pyo'):
+                    filename = filename[:-1]
+                yield filename
