--- /dev/null
+<!DOCTYPE html>
+<html>
+ <head>
+ <title>Title</title>
+ <meta http-equiv="Content-Type" content="text/html; charset=UTF-8"/>
+ <style type="text/css">
+ /* Slideshow styles */
+ </style>
+ </head>
+ <body>
+ <textarea id="source">
+
+class: center, middle
+
+# Caesar ciphers
+
+* Letter-by-letter enciphering
+
+---
+
+# The [string module](http://docs.python.org/3.3/library/string.html) is your friend
+
+```python
+import string
+string.ascii_letters
+string.ascii_lowercase
+string.ascii_uppercase
+string.digits
+string.punctuation
+```
+
+---
+
+# Doctest
+
+* Why document?
+* Why test?
+
+---
+
+# The magic doctest incantation
+
+```python
+if __name__ == "__main__":
+ import doctest
+ doctest.testmod()
+```
+
+---
+
+# Doing all the letters
+
+## Abysmal
+
+```python
+ciphertext = ''
+for i in range(len(plaintext)):
+ ciphertext += caesar_encipher_letter(plaintext[i], key)
+```
+
+---
+
+# Doing all the letters
+
+## (Merely) Bad
+
+```python
+ciphertext = ''
+for p in plaintext:
+ ciphertext += caesar_encipher_letter(p, key)
+```
+
+---
+
+# Doing all the letters
+
+## Good (but unPythonic)
+
+```python
+ciphertext = map(lambda p: caesar_encipher_letter(p, key), plaintext)
+```
+
+---
+
+# Doing all the letters
+
+## Best
+
+```python
+ciphertext = [caesar_encipher_letter(p, key) for p in plaintext]
+```
+
+
+ </textarea>
+ <script src="http://gnab.github.io/remark/downloads/remark-0.6.0.min.js" type="text/javascript">
+ </script>
+ <script type="text/javascript">
+ var slideshow = remark.create();
+ </script>
+ </body>
+</html>
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projects / cipher-training.git / commitdiff