CODEWITHSUNDEEP
pythonlistdictionarytuplesenumeration
acidprime
acidprime

Reputation: 279

Iterate a tuple of dictionaries and pass the nested dictionaries to a function

#!/usr/bin/python -tt

# A dictionary Of Each New SSID
WirelessNetwork = {}
WirelessNetwork['name'] = 'baz'
WirelessNetwork['type'] = 'bar'
WirelessNetwork['pass'] = 'foo'

# A list of all SSIDs
networkAddList = (WirelessNetwork)

def addWireless(passedDict={}):
  print 'Adding SSID: %s' % passedDict['name']
  print 'Of type: %s' % passedDict['type']
  print 'With Password: %s' % passedDict['pass']

for networkDict in networkAddList:
  addWireless(networkDict)

So I have a List "networkAddList" full of dictionaries ,i.e. "WirelessNetwork". I want to iterate that list "for networkDict in networkAddList" and pass the dictionary itself to my function "addWireless"

When I run the sample code above I get the following error:

TypeError: 'string indices must be integers, not str'

Which makes me think that python thinks passedDict is a string, thus thinking I want string indices i.e. 0 or something rather then the key 'name'. I'm new to python but I am going to have to do this kind of thing a lot so I hope somebody can point me in the right direction as I think its pretty simple. But I can't change the basic idea , i.e. a list of dictionaries.

Upvotes: 0

Views: 2139

Answers (4)

Makoto
Makoto

Reputation: 106480

Just ran a quick check of the types being referenced, and I'm believing that you were only missing a serial comma (in WirelessNetwork).

So, your code would look something like this:

networkAddList = (WirelessNetwork,)

Your for loop will then properly iterate over the dictionaries.

Upvotes: -1

dskinner
dskinner

Reputation: 10857

Actually it's not a list, even with a comma. It's a tuple, which is immutable. I bring this up in case your code is wanting to append anything to this later.

networkAddList = [WirelessNetwork] # or, list(WirelessNetwork)

Upvotes: 0

jordanm
jordanm

Reputation: 34974

When debugging in python you can confirm your suspicion that the value being passed is a string with the type function:

print type(passedDict)

When you create your tuple with one element, you need a trailing ",". Also note that a tuple is different from a list in python. The primary difference is that tuples are immutable and lists are not.

#!/usr/bin/python -tt

# A dictionary Of Each New SSID
WirelessNetwork = {}
WirelessNetwork['name'] = 'baz'
WirelessNetwork['type'] = 'bar'
WirelessNetwork['pass'] = 'foo'

# A list of all SSIDs
networkAddList = (WirelessNetwork,)

def addWireless(passedDict={}):
  print 'Adding SSID: %s' % passedDict['name']
  print 'Of type: %s' % passedDict['type']
  print 'With Password: %s' % passedDict['pass']

for networkDict in networkAddList:
  addWireless(networkDict)

Upvotes: 2

fabmilo
fabmilo

Reputation: 48330

this is not a list, is the value itself

# A list of all SSIDs
networkAddList = (WirelessNetwork)

with a comma becomes a list

# A list of all SSIDs
networkAddList = (WirelessNetwork,)

Upvotes: 0

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