Title

From: Neil Smith Date: Fri, 7 Mar 2014 20:08:20 +0000 (-0500) Subject: Added the first slide X-Git-Url: https://git.njae.me.uk/?p=cipher-training.git;a=commitdiff_plain;h=6f7db403eb131c5f6807cdbd5d4c5d570617fee9 Added the first slide --- diff --git a/slides/caesar-encipher.html b/slides/caesar-encipher.html new file mode 100644 index 0000000..4f99cc2 --- /dev/null +++ b/slides/caesar-encipher.html @@ -0,0 +1,101 @@ + + + + Title + + + + +

+
+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]
+```
+
+
+

+ + + + \ No newline at end of file