python入門之語句，包括if語句、while語句、for語句，供python初學者參考。

//if語句例子name = 'peirong';if name == 'peirong': print 'this is peirong';elif name== 'maojun': print 'this is maojun';else: print 'others';//while語句i = 0;a = range(10);while i < a.__len__(): print i; i = i+1;//for語句a = range(1,10);for i in a: print i;else: print 'The for loop is over!'//continue 語句a = range(1000)for i in a:  if i % 3 == 0:    print 'chuyi 3 yu 0 ';  elif i % 3 == 1:    print 'chuyi 3 yu 1 ';  else:    continue