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--- python [2017/04/24 16:21] – mgupton
+++ python [2023/03/20 17:33] (current) – [Python] mgupton
@@ Line 1: / Line 1: @@
 ======Python======
+  * [[https://www.python.org/dev/peps/pep-0008/|PEP 8 -- Style Guide for Python Code]]
+  * [[https://pep8.org/]]
+  * [[Python Modules and Packages]]
+  * [[Python Tools]]
+  * [[python:Handling Dates]]
 ======Core Elements & Constructs======
 =====Lists=====
@@ Line 41: / Line 49: @@
    b
 => {}
+</code>
+======Basic Structures and Constructs======
+  * If the %%__name__%% variable is set to %%__main__%% the module is being loaded as a main script and program entry point. Otherwise it's being loaded as a library module.
+<code python>
+if __name__ == "__main__":
+   print("Hello World.")
+else:
+   pass
+</code>
+======Conditionals======
+<code python>
+num = 100
+a = ["alpha", "beta", "gamma"]
+if "beta" in a:
+    pass
+if num > 10:
+    pass
+elif num < 10:
+    pass
+else:
+    pass
+</code>
+======Loops/Iteration======
+<code python>
+colors = ["red", "green", "blue"]
+for c in colors:
+    print("%s" % c)
 </code>
@@ Line 58: / Line 100: @@
 </code>
-======Basic Structures and Constructs======
+=====Iterate over indicies and values of sequence=====
-  * If the %%__name__%% variable is set to %%__main__%% the module is being loaded as a program entry point. Otherwise it's being loaded as a library module.
 <code python>
-if __name__ == "__main__":
+a = ["a", "b", "c"]
-    print("Hello World.")
+for k, v in enumerate(a):
+    print("%s, %s\n" % (k,v))
+</code>
+======Common Elements and Ways======
+======Determine if variable is defined======
+<WRAP round info>
+It might be a code smell/anti-pattern to test whether or not an identifier is defined. That is, testing whether a variable is defined considered harmful.
+</WRAP>
+=====Method 1======
+<code>
+x_exists = 'x' in locals() or 'x' in globals()
+</code>
+=====Method 2======
+<code python>
+try:
+  x
+except NameError:
+  x_exists = False
 else:
-    pass
+  x_exists = True
 </code>
-======Conditionals======
+=====Method 3=====
 <code python>
-num = 100
+hasattr(a, 'property')
+</code>
-a = ["alpha", "beta", "gamma"]
+=====Method 4=====
+<code python>
+if args.file is None or len(args.file) == 0:
-if "beta" in a:
+    pass
-  pass
-if num > 10:
-  pass
-elif num < 10:
-  pass
-else:
-  pass
 </code>
+=======Resources/References======
+  * [[http://docs.python-guide.org/en/latest/|The Hitchhiker’s Guide to Python]]
+  * [[https://realpython.com/|Real Python]], tutorials and other learning resources