python逃脫美元符號

Question

我正在努力理解此語法有什么問題：

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()) 

錯誤信息：

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

是美元符號（$），如果是，該如何解決？

Answer 1

您需要在Python中的任何特殊字符串（在這種情況下為'$ in'）周圍加上引號-您可能正在查看使用javascript編寫的Mongo文檔，而不是為Python客戶端編寫的pymongo客戶端文檔（我做了同樣的事;））。

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())