Python 语法练习题，,001、string

Python 语法练习题，,001、string

001、strings=["a","as","bat","car","dove","python"] 过滤掉长度小于等于2的字符串，并将剩下的字符串转换成大写字母形式。

方法一：

strings=["a","as","bat","car","dove","python"]y = filter(lambda string: len(string) > 2, strings)list(map(lambda s: s.upper(), y))# [i.upper() for i in y]

方法二：

strings=["a","as","bat","car","dove","python"] 

[i.upper() for i in y]

002、 strings=["a","as","bat","car","dove","python"] 创建一个指向列表位置的映射关系的字典。

方法一：

strings=["a","as","bat","car","dove","python"]dic = {}for i in range(len(strings)):    dic[i] = strings[i]dic

方法二：

strings=["a","as","bat","car","dove","python"]dic = {}for i, s in enumerate(strings):    dic[i] = s    dic

方法三：

strings=["a","as","bat","car","dove","python"]dict((k, v) for k, v in enumerate(strings))

方法四：

strings=["a","as","bat","car","dove","python"]{i: s for i, s in enumerate(strings)}

003、some_tuples=[(1,2,3),(4,5,6),(7,8,9)] 将这个整数元组构成的列表成为一个简单的整数列表。

方法一：

some_tuples=[(1,2,3),(4,5,6),(7,8,9)]lst = []for tup in some_tuples:    for num in tup:        lst.append(num)        lst

方法二：

some_tuples=[(1,2,3),(4,5,6),(7,8,9)][num for tup in some_tuples for num in tup ]

004、all_data=[["Tom","Billy","Jefferson","Andrew","Wesley","Steven","Joe"], ["Susie","Casey","Jill","Ana","Eva","Jennifer","Stephanie"]]我们要找出带有2个或以上的字母e的名字，并将它们放入一个新列表.

方法一：

all_data=[["Tom","Billy","Jefferson","Andrew","Wesley","Steven","Joe"],          ["Susie","Casey","Jill","Ana","Eva","Jennifer","Stephanie"]][s for lst in all_data for s in lst if s.count(‘e‘) >= 2]

Python 语法练习题