Differences

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--- cs_lang:python:things-to-know:native-datatypes [2010/12/12 18:05] – cedric
+++ cs_lang:python:things-to-know:native-datatypes [2011/01/11 14:26] (current) – cedric
@@ Line 11: / Line 11: @@
 ====== Booleans ======
 <code python>
+>>> x = 42
+>>> 19 <= x <= 51
+True
+>>> 19 <= x <= 41
+False
+>>>
 >>> 0 == False
 True
@@ Line 31: / Line 37: @@
 </code>
+<code python>
+>>> import this
+>>> love = this
+>>> this is love
+True
+>>> love is True
+False
+>>> love is False
+False
+>>> love is not True or False
+True
+>>> love is not True or False; love is love
+True
+True
+</code>
 ====== Numbers ======
@@ Line 123: / Line 144: @@
 </code>
-===== List comprehension =====
-<code python>
->>> [a for a in range(0,99) if a % 2 == 0]
-[0, 2, 4, 6, 8, 10, 12, 14, 16, 18, 20, 22, 24, 26, 28, 30, 32, 34, 36, 38, 40, 42, 44, 46, 48, 50, 52, 54, 56, 58, 60, 62, 64, 66, 68, 70, 72, 74, 76, 78, 80, 82, 84, 86, 88, 90, 92, 94, 96, 98]
->>>
->>> [a % 2 == 0 for a in range(0,99)]
-[True, False, True, False, True, False, True, False, True, False, True, False, True, False, True, False, True, False, True, False, True, False, True, False, True, False, True, False, True, False, True, False, True, False, True, False, True, False, True, False, True, False, True, False, True, False, True, False, True, False, True, False, True, False, True, False, True, False, True, False, True, False, True, False, True, False, True, False, True, False, True, False, True, False, True, False, True, False, True, False, True, False, True, False, True, False, True, False, True, False, True, False, True, False, True, False, True, False, True]
-</code>
+====== Dictionaries ======
+<code python>
+>>> a_dict = {'server': 'cedricbonhomme.org', 'database':'mysql'}
+>>>
+>>> a_dict['blog']
+Traceback (most recent call last):
+  File "<stdin>", line 1, in <module>
+KeyError: 'blog'
+>>> 'blog' in a_dict
+False
+>>> a_dict['blog'] = 'wordpress'
+>>> a_dict
+{'blog': 'dotclear', 'database': 'mysql', 'server': 'cedricbonhomme.org'}
+>>>
+>>>
+>>> a_dict.keys()
+dict_keys(['blog', 'database', 'server'])
+>>> a_dict.values()
+dict_values(['dotclear', 'mysql', 'cedricbonhomme.org'])
+</code>