extracting key-value pairs from a list of dictionaries in Python

Question

I have dictionary in the following format stored inside a list.Below are listed the 12 members (dictionaries) of list switch_ports

[ {'type': 'port', 'number': 1, 'port_state': 1, 'state': 'active', 'port_id': '00:00:00:00:00:00:02:011', 'desc': 's1-eth1'}, {'type': 'port', 'number': 2, 'port_state': 1, 'state': 'active', 'port_id': '00:00:00:00:00:00:02:012', 'desc': 's1-eth2'}, {'type': 'port', 'number': 1, 'port_state': 1, 'state': 'active', 'port_id': '00:00:00:00:00:00:02:021', 'desc': 's2-eth1'}, {'type': 'port', 'number': 2, 'port_state': 1, 'state': 'active', 'port_id': '00:00:00:00:00:00:02:022', 'desc': 's2-eth2'}, {'type': 'port', 'number': 1, 'port_state': 1, 'state': 'active', 'port_id': '00:00:00:00:00:00:02:031', 'desc': 's3-eth1'}, {'type': 'port', 'number': 2, 'port_state': 1, 'state': 'active', 'port_id': '00:00:00:00:00:00:02:032', 'desc': 's3-eth2'}, {'type': 'port', 'number': 1, 'port_state': 1, 'state': 'active', 'port_id': '00:00:00:00:00:00:02:041', 'desc': 's4-eth1'}, {'type': 'port', 'number': 2, 'port_state': 1, 'state': 'active', 'port_id': '00:00:00:00:00:00:02:042', 'desc': 's4-eth2'}, {'type': 'port', 'number': 1, 'port_state': 1, 'state': 'active', 'port_id': '00:00:00:00:00:00:02:051', 'desc': 's5-eth1'}, {'type': 'port', 'number': 2, 'port_state': 1, 'state': 'active', 'port_id': '00:00:00:00:00:00:02:052', 'desc': 's5-eth2'}, {'type': 'port', 'number': 1, 'port_state': 1, 'state': 'active', 'port_id': '00:00:00:00:00:00:02:061', 'desc': 's6-eth1'}, {'type': 'port', 'number': 2, 'port_state': 1, 'state': 'active', 'port_id': '00:00:00:00:00:00:02:062', 'desc': 's6-eth2'}]

From the list switch_ports I want to access port_id above. How do I do that?

If I do

for port in switch_ports: print(port)

I get the same output as above. However If I try to access individual key-value pairs as below.

for port in switch_ports: print(port[port_id])

How do I get the port_id (e.g 00:00:00:00:00:00:02:062) from the list switch_ports

thefourtheye · Accepted Answer · 2014-06-15 03:17:04Z

You are almost there. Just use port_id as a string, like this

for port in switch_ports: print(port["port_id"])

If you want to gather all the port_ids as a list, then use list comprehension like this

port_ids = [port["port_id"] for port in switch_ports]

Online Demo

Aaron Hall · Accepted Answer · 2014-06-15 03:20:33Z

An alternative, use itemgetter from the operator module:

>>> import operator >>> operator.itemgetter('port_id') <operator.itemgetter object at 0x7f318d7b8b90> >>> port_id = operator.itemgetter('port_id') >>> for port in switch_ports: ... print port_id(port) ...

prints:

00:00:00:00:00:00:02:011 00:00:00:00:00:00:02:012 00:00:00:00:00:00:02:021 00:00:00:00:00:00:02:022 00:00:00:00:00:00:02:031 00:00:00:00:00:00:02:032 00:00:00:00:00:00:02:041 00:00:00:00:00:00:02:042 00:00:00:00:00:00:02:051 00:00:00:00:00:00:02:052 00:00:00:00:00:00:02:061 00:00:00:00:00:00:02:062

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extracting key-value pairs from a list of dictionaries in Python

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