json的dump和dumps的区别

dump将字典转换为json字符串并存入文件中
dumps将字典转换为json字符串

json.dump(dict, open(filename, "w"))
json.dumps(dict)

json的dump方法比dumps方法多了一个参数，也就是文件名

jsObj = json.dumps(dict)      
with open(filename, "w") as f:    
    f.write(jsObj)    
    f.close()    

等同于

json.dump(dict, open(filename, "w"))