7.10 and for some reason the following code snippet is producing an error...
device_info = {'username': 'test', 'password': 'test', 'appliance': 'name', 'hostname': 'hostname', 'prodcut': 'juice'}
print "{} {} {} {} {}".format(**device_info)
This raises an exception:
Traceback (most recent call last):
File "python", line 4, in <module>
print "{} {} {} {} {}".format(**device_info)
IndexError: tuple index out of range
I believe this code should be syntactically sound, however, I don't seem to be able to unpack my dict to pass to any functions, not sure why that doesn't work.
You are passing in your fields as keyword arguments, because you are using ** syntax:
"....".format(**device_info)
# ^^
Your placeholders, however, specifically only work with positional arguments; placeholders without any name or index, are automatically numbered:
"{} {} {} {} {}".format(...)
# ^0 ^1 ^2 ^3 ^4
This is why you get an index error, there is no positional argument with index 0. Keyword arguments have no index, because they are essentially key-value pairs in a dictionary, which are unordered structures.
If you wanted to include the values from the dictionary into a string, then you need to explicitly name your placeholders:
"{username} {password} {appliance} {hostname} {prodcut}".format(**device_info)
(but note the misspelling of product as prodcut, you may want to check if your dictionary keys are spelled correctly).
You'd get all the values inserted in the named slots:
>>> print "{username} {password} {appliance} {hostname} {prodcut}".format(**device_info)
test test name hostname juice
If you expected the keys to be printed, then you'd have to pass in the device_info keys as separate positional arguments; "...".format(*device_info) (single *) would do just that, but then you'd also have to content with the 'arbitrary' dictionary order that the keys would be listed in.