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Fix a few bugs
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@ -52,7 +52,7 @@ not False #=> True
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"Hello " + "world!" #=> "Hello world!"
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"Hello " + "world!" #=> "Hello world!"
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# A string can be treated like a list of characters
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# A string can be treated like a list of characters
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"This is a string"[0] #=> 'H'
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"This is a string"[0] #=> 'T'
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# None is an object
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# None is an object
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None #=> None
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None #=> None
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@ -120,10 +120,10 @@ filled_dict = {"one": 1, "two": 2, "three": 3}
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filled_dict["one"] #=> 1
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filled_dict["one"] #=> 1
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# Get all keys as a list
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# Get all keys as a list
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filled_dict.keys()
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filled_dict.keys() #=> ["three", "two", "one"] Note - Dictionary key ordering is not guaranteed. Your results might not match this exactly.
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# Get all values as a list
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# Get all values as a list
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filled_dict.values()
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filled_dict.values() #=> [3, 2, 1] Note - Same as above regarding key ordering.
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# Check for existence of keys in a dictionary with in
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# Check for existence of keys in a dictionary with in
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"one" in filled_dict #=> True
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"one" in filled_dict #=> True
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@ -158,6 +158,7 @@ filled_set | other_set #=> set([1, 2, 3, 4, 5, 6])
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some_var = 5
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some_var = 5
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# Here is an if statement. INDENTATION IS SIGNIFICANT IN PYTHON!
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# Here is an if statement. INDENTATION IS SIGNIFICANT IN PYTHON!
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# prints "some var is smaller than 10"
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if some_var > 10:
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if some_var > 10:
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print "some_var is totally bigger than 10."
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print "some_var is totally bigger than 10."
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elif some_var < 10: # This elif clause is optional.
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elif some_var < 10: # This elif clause is optional.
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@ -165,13 +166,27 @@ elif some_var < 10: # This elif clause is optional.
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else: # This is optional too.
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else: # This is optional too.
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print "some_var is indeed 10."
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print "some_var is indeed 10."
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# For loops iterate over lists
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"""
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For loops iterate over lists
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prints:
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dog is a mammal
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cat is a mammal
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mouse is a mammal
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"""
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for animal in ["dog", "cat", "mouse"]:
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for animal in ["dog", "cat", "mouse"]:
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print "%s is a mammal" % animal # You can use % to interpolate formatted strings
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print "%s is a mammal" % animal # You can use % to interpolate formatted strings
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# While loops go until a condition is no longer met.
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"""
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While loops go until a condition is no longer met.
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prints:
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0
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1
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2
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3
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"""
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x = 0
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x = 0
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while x < 10:
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while x < 4:
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print x
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print x
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x += 1 # Short hand for x = x + 1
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x += 1 # Short hand for x = x + 1
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@ -252,7 +267,7 @@ class Human(object):
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# A method. All methods take self as the first argument, including the initializer
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# A method. All methods take self as the first argument, including the initializer
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def say(self, msg):
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def say(self, msg):
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return "%s: %s" % (this.name, msg)
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return "%s: %s" % (self.name, msg)
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# A class method is shared among all instances
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# A class method is shared among all instances
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@classmethod
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@classmethod
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@ -261,7 +276,7 @@ class Human(object):
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# Static methods are called without a parameter reference to the class or instance
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# Static methods are called without a parameter reference to the class or instance
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@staticmethod
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@staticmethod
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def grunt(self):
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def grunt():
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return "*grunt*"
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return "*grunt*"
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