Use set to key vowels，usevowels,import setsc
Use set to key vowels，usevowels,import setsc
import setsclass Keeper(object): def __init__(self, keep): self.keep = sets.Set(map(ord, keep)) def __getitem__(self, n): if n not in self.keep: return None return unichr(n) def __call__(self, s): return s.translate(self)makefilter = Keeperif __name__ == '__main__': just_vowels = makefilter('aeiouy') print just_vowels(u'four score and seven years ago') print just_vowels(u'tiger, tiger burning bright')- Load bitmap into a Canvas，bitmapcanvas,from Tkinter
- Parameter passing: mixed with dictionary and tuple，par
- Nested if statement，nestedifstatement,x = 1if x:
- List offset: start at zero, negative and slicing，negat
- List: Length, Minimum, and Maximum，minimummaximum,numb
- A function definition，functiondefinition,def square(x
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- Load bitmap into a Canvas，bitmapcanvas,from Tkinter
- Parameter passing: mixed with dictionary and tuple，parametertuple,d
- Nested if statement，nestedifstatement,x = 1if x:
- List offset: start at zero, negative and slicing，negativeslicing,L
- List: Length, Minimum, and Maximum，minimummaximum,numbers = [1
- A function definition，functiondefinition,def square(x
- Dictionary: clear method removes all items from the dictionary，remo
- Dictionary Keys Are Case-Sensitive，keyscase-sensitive,d = {} d['ke
- Mouse events on a frame: Mouse clicked, position，eventsclicked,from
- Read a file line by line，fileline,file = open(
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