Python Learning Notes (3)--dict&tuple&somthing Advance

1. Item

1 my_dict ={'a': 1,'b': 2}2  Print  my_dict.items ()34 [('a', 1), ('  b', 2)]

2, Keys,values

 1  my_dict ={ " a  : 1,"  b   ": 2}  2  print   My_dict.keys ()  3  print   My_dict.values ()  4  5  [ " a   ", "  b      6  [1, 2] 

3. Advanced List

1New_list = [x forXinchRange (1,6)]2 #= = [1, 2, 3, 4, 5]3Doubles = [x*2 forXinchRange (1,6)]4 #= = [2, 4, 6, 8, ten]5Doubles_by_3 = [x*2 forXinchRange (1,6)if(x*2)%3 = =0]6 #= [6]7Even_squares = [x**2 forXinchRange (1,11)ifx%2 = =0]8 #= = [4 , +, +, +--]

1 " ! Xexgxaxsxsxexmx xtxexrxcxexsx xexhxtx xmxax XI"2 message = garbled[::-2]#逆序 3 Print message 4 # I am The secret message!

4. Lambda

1languages = ["HTML","JavaScript","Python","Ruby"]2 PrintFilterLambdaX:x = ='Python', Languages)3 #[' Python ']

Equivalent to

1languages = ["HTML","JavaScript","Python","Ruby"]2 defBy_py (languages):3Lst_new = []4      forIinchlanguages:5         ifi = ='Python':6 lst_new.append (i)7     returnlst_new8 PrintBy_py (Languages)

　　

1 my_list = range (2)Print filter (lambda x:x% 3 = = 0, my_list) 
    3#[0, 3, 6, 9, and up]

Equivalent to

1 my_list = range (2)def  by_three (x):3     lst_new = []  4for in       x:5         if i%3 = = 0: 6             lst_new.append (i)7     return lst_new 8 print by_three (my_list)

1  for  in range (1,11)]2print filter (lambda x:30<=x<=70,squares)

Equivalent to

1Squares = [x**2 forXinchRange (1,11)]2 defby_sq (squares):3Lst_new = []4      forIinchSquares:5         if30<=i<=70:6 lst_new.append (i)7     returnlst_new8 PrintBY_SQ (squares)

Python Learning Notes (3)--dict&tuple&somthing Advance