Python爬虫:url中带字典列表参数的编码转换方法
平时见到的url参数都是key-value,一般vlaue都是字符串类型的
如果有幸和我一样遇到字典，列表等参数，那么就幸运了
python2代码
importjson
fromurllibimporturlencode
#1.直接将url编码
params={
"name":"Tom",
"hobby":["ball","swimming"],
"books":[{"name":"语文","pages":20}]
}
print(urlencode(params))
"""
hobby=%5B%27ball%27%2C+%27swimming%27%5D&
books=%5B%7B%27name%27%3A+%27%5Cxe8%5Cxaf%5Cxad%5Cxe6%5Cx96%5Cx87%27%2C+%27pages%27%3A+20%7D%5D&
name=Tom
"""
#2.先用json序列化字典和列表参数
params={
"name":"Tom",
"hobby":json.dumps(["ball","swimming"]),
"books":json.dumps([{"name":"语文","pages":20}])
}
print(urlencode(params))
"""
hobby=%5B%22ball%22%2C+%22swimming%22%5D&
books=%5B%7B%22name%22%3A+%22%5Cu8bed%5Cu6587%22%2C+%22pages%22%3A+20%7D%5D&
name=Tom
"""
观察1和2序列化出来的url参数不是一样的，如果第一种方式的url不能正常访问，那么就用第二种
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