exemplos de varios patterns

ramalho · ramalho · commit eed298aaec6b · 2015-08-16T13:56:15.000-03:00
diff --git a/adapter/teste.txt b/adapter/teste.txt
@@ -0,0 +1 @@
+TESTANDO...
diff --git a/adapter/upperfile.py b/adapter/upperfile.py
@@ -0,0 +1,30 @@
+"""
+    >>> with UppercasingFile('teste.txt', 'wt', encoding='utf-8') as f:
+    ...    f.write('Testando...')
+    11
+    >>> with UppercasingFile('teste.txt', encoding='utf-8') as f:
+    ...    s = f.read()
+    >>> s
+    'TESTANDO...'
+
+"""
+
+
+
+class UppercasingFile:
+    def __init__(self, *a, **k):
+        self.f = open(*a, **k)
+
+    def write(self, data):
+        return self.f.write(data.upper())
+
+    def __getattr__(self, name):
+        return getattr(self.f, name)
+
+    def __enter__(self, *a, **k):
+        return self
+
+    def __exit__(self, *a, **k):
+        self.f.__exit__(*a, **k)
+
+
diff --git a/command/turtle.py b/command/turtle.py
@@ -0,0 +1,73 @@
+import cmd, sys
+from turtle import *
+
+class TurtleShell(cmd.Cmd):
+    intro = 'Welcome to the turtle shell.   Type help or ? to list commands.\n'
+    prompt = '(turtle) '
+    file = None
+
+    # ----- basic turtle commands -----
+    def do_forward(self, arg):
+        'Move the turtle forward by the specified distance:  FORWARD 10'
+        forward(*parse(arg))
+    def do_right(self, arg):
+        'Turn turtle right by given number of degrees:  RIGHT 20'
+        right(*parse(arg))
+    def do_left(self, arg):
+        'Turn turtle left by given number of degrees:  LEFT 90'
+        left(*parse(arg))
+    def do_goto(self, arg):
+        'Move turtle to an absolute position with changing orientation.  GOTO 100 200'
+        goto(*parse(arg))
+    def do_home(self, arg):
+        'Return turtle to the home position:  HOME'
+        home()
+    def do_circle(self, arg):
+        'Draw circle with given radius an options extent and steps:  CIRCLE 50'
+        circle(*parse(arg))
+    def do_position(self, arg):
+        'Print the current turle position:  POSITION'
+        print('Current position is %d %d\n' % position())
+    def do_heading(self, arg):
+        'Print the current turle heading in degrees:  HEADING'
+        print('Current heading is %d\n' % (heading(),))
+    def do_color(self, arg):
+        'Set the color:  COLOR BLUE'
+        color(arg.lower())
+    def do_undo(self, arg):
+        'Undo (repeatedly) the last turtle action(s):  UNDO'
+    def do_reset(self, arg):
+        'Clear the screen and return turtle to center:  RESET'
+        reset()
+    def do_bye(self, arg):
+        'Stop recording, close the turtle window, and exit:  BYE'
+        print('Thank you for using Turtle')
+        self.close()
+        bye()
+        return True
+
+    # ----- record and playback -----
+    def do_record(self, arg):
+        'Save future commands to filename:  RECORD rose.cmd'
+        self.file = open(arg, 'w')
+    def do_playback(self, arg):
+        'Playback commands from a file:  PLAYBACK rose.cmd'
+        self.close()
+        with open(arg) as f:
+            self.cmdqueue.extend(f.read().splitlines())
+    def precmd(self, line):
+        line = line.lower()
+        if self.file and 'playback' not in line:
+            print(line, file=self.file)
+        return line
+    def close(self):
+        if self.file:
+            self.file.close()
+            self.file = None
+
+def parse(arg):
+    'Convert a series of zero or more numbers to an argument tuple'
+    return tuple(map(int, arg.split()))
+
+if __name__ == '__main__':
+    TurtleShell().cmdloop()
diff --git a/decorator/registration.py b/decorator/registration.py
@@ -0,0 +1,27 @@
+registry = []  # <1>
+
+def register(func):  # <2>
+    print('running register(%s)' % func)  # <3>
+    registry.append(func)  # <4>
+    return func  # <5>
+
+@register  # <6>
+def f1():
+    print('running f1()')
+
+@register
+def f2():
+    print('running f2()')
+
+def f3():  # <7>
+    print('running f3()')
+
+def main():  # <8>
+    print('running main()')
+    print('registry ->', registry)
+    f1()
+    f2()
+    f3()
+
+if __name__=='__main__':
+    main()  # <9>
diff --git a/template-method/introspect.py b/template-method/introspect.py
@@ -0,0 +1,24 @@
+
+# EAFP -> It's Easier to Ask Forgiveness than Permission
+def docmd(self, cmd, a):
+    #...
+    try:
+        fn = getattr(self, 'do_' + cmd)
+    except AttributeError:
+        return self.dodefault(cmd, a)
+    return fn(a)
+
+
+def docmd(self, cmd, a):
+    #...
+    return getattr(self, 'do_' + cmd, self.dodefault)(a)
+
+
+# LBYL -> Look Before You Leap
+def docmd(self, cmd, a):
+    #...
+    if hasattr(self, 'do_' + cmd):
+        fn = getattr(self, 'do_' + cmd)
+        return fn(a)
+    else:
+        return self.dodefault(cmd, a)
