MongoDB Tutorial => PyMongo queries

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Example

Once you got a collection object, queries use the same syntax as in the mongo shell. Some slight differences are:

every key must be enclosed in brackets. For example:
```
db.find({frequencies: {$exists: true}})
```
becomes in pymongo (note the True in uppercase):
```
db.find({"frequencies": { "$exists": True }})
```
objects such as object ids or ISODate are manipulated using python classes. PyMongo uses its own ObjectId class to deal with object ids, while dates use the standard datetime package. For example, if you want to query all events between 2010 and 2011, you can do:
```
 from datetime import datetime

 date_from = datetime(2010, 1, 1)
 date_to = datetime(2011, 1, 1)
 db.find({ "date": { "$gte": date_from, "$lt": date_to } }):
```

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