Question

我很难理解这种语法有什么问题：

from pymongo import MongoClient

client = MongoClient('localhost', 27017)
db = client.monitor
#cursor = db.monitoring_logs.find({"widget": "56dfed49a2988d9019000585;"})
cursor = db.monitoring_logs.find({"widget": {$in:["56dfed49a2988d9019000585;","56d58f5b1dc95f54460002f6;"]}})
print (cursor.count())

错误消息：

C:\Users\Nir.Regev\Anaconda3\python.exe C:/Users/Nir.Regev/PycharmProjects/anomaly/get_mongo_data.py
  File "C:/Users/Nir.Regev/PycharmProjects/anomaly/get_mongo_data.py", line 6
    cursor = db.monitoring_logs.find({"widget": {$in:["56dfed49a2988d9019000585;","56d58f5b1dc95f54460002f6;"]}})
                                                 ^
SyntaxError: invalid syntax

Process finished with exit code 1

是美元符号（$），如果是这样，怎么绕过这个？

Answer 1

你需要在Python中的任何特殊字符串周围加上引号（在这种情况下为＆＃39; $ in;＃）; - 你可能正在查看使用javascript编写的Mongo文档，而不是pymongo客户端文档，这是为Python客户端编写的（我也做了同样的事情;））。

from pymongo import MongoClient

client = MongoClient('localhost', 27017)
db = client.monitor
#cursor = db.monitoring_logs.find({"widget": "56dfed49a2988d9019000585;"})
cursor = db.monitoring_logs.find({"widget": {'$in': ["56dfed49a2988d9019000585;","56d58f5b1dc95f54460002f6;"]}})
print (cursor.count())

蟒蛇逃脱美元符号

1 个答案: