Advanced Topics in Python
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Python 入门教程 15 ---- Advanced Topics in Python
第一节
1 介绍了字典的一个内置方法items()
2 比如我有一个字典d={"a":1,"b":2,"c":3},那么我print d.items()将会输出[("a",1),("b",2),("c",3)]
3 练习:设置一个名为my_dict的字典,调用它的items方法来输出内容
- my_dict = {
- "a": 1,
- "b": 2,
- "c": 3
- }
- print my_dict.items()
第二节
1 介绍了字典的另外两种方法,keys()和values(),用于输出字典的key的集合和value的集合,用法和items相似
2 练习:代替第一节中的items方法,利用keys和values方法来输出key和value的集合
- my_dict = {
- "a": 1,
- "b": 2,
- "c": 3
- }
- print my_dict.keys()
- print my_dict.values()
- >>['a', 'c', 'b']
- >>[1, 3, 2]
第三节
1 介绍了怎样初始化一个list的用法
2 比如new_list = [x for x in range(1,6)] 那么# => [1, 2, 3, 4, 5],doubles = [x*2 for x in range(1,6)]# => [2, 4, 6, 8, 10],doubles_by_3 = [x*2 for x in range(1,6) if (x*2)%3 == 0] # => [6]
3 练习:初始化一个名为even_squares的列表,值为1~10区间能够被2整除的数的平方
- even_squares = [i**2 for i in range(1,11) if i%2 == 0]
- print even_squares
第四节
1 介绍了我们怎么把一个list反转过来,比如[1,2,3,4]反转为[4,3,2,1]
2 介绍了我们可以使用[start:end:stride]来得到list的某个区间从start开始到end,增量为stride
3 练习:把变量backwards的值设置为my_list的反转
- my_list = range(1, 11)
- # Add your code below!
- backwards = my_list[::-1]
第五节
1 介绍了Python里面lambda的使用方式,lambda variable: condition,如果variable满足这个条件那么就为真
2 比如lambda x: x % 3 == 0,等价于def by_three(x): return x % 3 == 0
3 练习:把列表squares的值设置为1~10区间数的平方,然后利用lambda打印出大于等于30小于等于70的数
- squares = [i**2 for i in range(1 , 11)]
- print filter(lambda x : x >= 30 and x <= 70 , squares)
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