Python(3)—列表、字典使用

 1、list

正则表达式的使用：https://www.cnblogs.com/huxi/archive/2010/07/04/1771073.html

读取文件list

# 读文件
with open("test.txt", 'r') as fr:
    for i in fr:
        print(i)
   
# 写文件
with open("test.txt", 'wr') as fr:
    fr.write("hello world!")

# 列表
test_list = [1, 2, 3, 3, 2]
test_list.append(0)
for i in range(len(test_list)):
    print i, "  ", test_list[i]

# 
print(test_list.count(3))
test_list.sort()  # reverse=True 填写参数标识逆序
for i in range(len(test_list)):
    print i, "  ", test_list[i]

 

 

2、dict

遍历词典，添加元素

def test_dict(test_lists):
    vertical = {}
    for list in test_lists:
        for item in list:
            item_ext = item.get("ext", {})
            types = item_ext.get("types", [])
            res_key = "other"
            if 0 in types or 5 in types:
                res_key = "news"
            elif 1 in types:
                res_key = "image"
            elif 14 in types:
                res_key = "video"
            vertical[res_key] = vertical.get(res_key, 0) + 1
    return vertical

 

test_list = [1, 2, 3, 3, 2]
try:
    print test_list[9]
except:
    print "fail!"
    continue