蟒越獄美元符號

Question

我努力理解什麼是錯的語法如下：

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 

是美元符號（$），如果是如何得到解決這個 ？

Answer 1

你需要把引號的任何特殊字符串在Python（「$在」在這種情況下） - 你可能會尋找在其使用JavaScript編寫的Mongo的文檔，而不是pymongo客戶端的文檔，這是寫對於Python客戶端（我也這樣做了;））。

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())