Key to the Missing
From Wikipedia, the free encyclopedia
| Key to the Missing | |
|---|---|
| Starring | Archdale Jones |
| Country of origin |  United States |
| Production | |
| Running time | 30 minutes |
| Release | |
| Original network | DuMont |
| Original release | July 4, 1948 ( 1948-07-04 ) – September 23, 1949 ( 1949-09-23 ) |
Key to the Missing was a TV series which aired on Fridays at 7pm EST on the DuMont Television Network from 4 July 1948 to 23 September 1949. Each 30-minute episode was hosted by Archdale Jones (1901-1983).
The series interviewed people looking for long-lost friends and relatives. The series was typical of TV programming of the time, when the major TV networks were trying out various untested concepts and ideas. Although short-lived, the basic concept has been re-used many times since, usually by independent TV stations and small TV networks.
Where Are They Now, the radio program on which the series was based claimed a 68 percent success rate.
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Adding missing keys in dictionary in Python
I have a list of dictionaries:
As you can see, the dictionaries have different length. What I need is to add missing keys:values to every dictionary to make them being with the same length:
Means to add zeros for missing values. The maximum length isn’t given in advance, so one may get it only iterating through the list.
I tried to make something with defaultdicts, like L1 = defaultdict(L) but it seems I don’t understand properly how does it work.
6 Answers 6
a bit of caution: changes L
You’ll have to make two passes: 1 to get the union of all keys, and another to add the missing keys:
This uses an ’empty’ dictionary as a base to quickly produce all keys; a new copy of this dictionary plus an original dictionary produces the output you want.
Note that this assumes your keys are always sequential. If they are not, you can produce the union of all existing keys instead:
or the set approach:
The above approach to merge two dictionaries into a new one with dict(d1, **d2) always works in Python 2. In Python 3 additional constraints have been set on what kind of keys you can use this trick with; only string keys are allowed for the second dictionary. For this example, where you have numeric keys, you can use a union of their dictionary views instead:
Источник
Adding missing keys in dictionary in Python
I have a list of dictionaries:
As you can see, the dictionaries have different length. What I need is to add missing keys:values to every dictionary to make them being with the same length:
Means to add zeros for missing values. The maximum length isn’t given in advance, so one may get it only iterating through the list.
I tried to make something with defaultdicts, like L1 = defaultdict(L) but it seems I don’t understand properly how does it work.
6 Answers 6
a bit of caution: changes L
You’ll have to make two passes: 1 to get the union of all keys, and another to add the missing keys:
This uses an ’empty’ dictionary as a base to quickly produce all keys; a new copy of this dictionary plus an original dictionary produces the output you want.
Note that this assumes your keys are always sequential. If they are not, you can produce the union of all existing keys instead:
or the set approach:
The above approach to merge two dictionaries into a new one with dict(d1, **d2) always works in Python 2. In Python 3 additional constraints have been set on what kind of keys you can use this trick with; only string keys are allowed for the second dictionary. For this example, where you have numeric keys, you can use a union of their dictionary views instead:
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How to make a python dictionary that returns key for keys missing from the dictionary instead of raising KeyError?
I want to create a python dictionary that returns me the key value for the keys are missing from the dictionary.
6 Answers 6
dict s have a __missing__ hook for this:
Why don’t you just use
Sure, you can subclass dict as others point out, but I find it handy to remind myself every once in a while that get can have a default value!
If you want to have a go at the defaultdict , try this:
except. well: AttributeError: ^collections.defaultdict^object attribute ‘__missing__’ is read-only , so you will have to subclass:
The first respondent mentioned defaultdict , but you can define __missing__ for any subclass of dict :
Also, I like the second respondent’s approach:
Congratulations. You too have discovered the uselessness of the standard collections.defaultdict type. If that execrable midden heap of code smell offends your delicate sensibilities as much as it did mine, this is your lucky StackOverflow day.
Thanks to the forbidden wonder of the 3-parameter variant of the type() builtin, crafting a non-useless default dictionary type is both fun and profitable.
What’s Wrong with dict.__missing__()?
Absolutely nothing, assuming you like excess boilerplate and the shocking silliness of collections.defaultdict – which should behave as expected but really doesn’t. To be fair, Jochen Ritzel’s accepted solution of subclassing dict and implementing the optional __missing__() method is a fantastic workaround for small-scale use cases only requiring a single default dictionary.
But boilerplate of this sort scales poorly. If you find yourself instantiating multiple default dictionaries, each with their own slightly different logic for generating missing key-value pairs, an industrial-strength alternative automating boilerplate is warranted.
Or at least nice. Because why not fix what’s broken?
Introducing DefaultDict
In less than ten lines of pure Python (excluding docstrings, comments, and whitespace), we now define a DefaultDict type initialized with a user-defined callable generating default values for missing keys. Whereas the callable passed to the standard collections.defaultdict type uselessly accepts no parameters, the callable passed to our DefaultDict type usefully accepts the following two parameters:
- The current instance of this dictionary.
- The current missing key to generate a default value for.
Given this type, solving sorin’s question reduces to a single line of Python:
Code or It Didn’t Happen
The key . get it, key? to this arcane wizardry is the call to the 3-parameter variant of the type() builtin:
This single line dynamically generates a new dict subclass aliasing the optional __missing__ method to the caller-defined callable. Note the distinct lack of boilerplate, reducing DefaultDict usage to a single line of Python.
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Key to the Missing
Last updated June 09, 2021
| Key to the Missing | |
|---|---|
| Starring | Archdale Jones |
| Country of origin | United States |
| Production | |
| Running time | 30 minutes |
| Release | |
| Original network | DuMont |
| Original release | July 4, 1948 ( 1948-07-04 ) – September 23, 1949 ( 1949-09-23 ) |
Key to the Missing was a TV series which aired on Fridays at 7pm EST on the DuMont Television Network from 4 July 1948 to 23 September 1949. Each 30-minute episode was hosted by Archdale Jones (1901-1983).
Contents
The series interviewed people looking for long-lost friends and relatives. The series was typical of TV programming of the time, when the major TV networks were trying out various untested concepts and ideas. Although short-lived, the basic concept has been re-used many times since, usually by independent TV stations and small TV networks.
Where Are They Now, the radio program on which the series was based claimed a 68 percent success rate.
Episode status
As with most DuMont series, no episodes are known to survive.
See also
Bibliography
- David Weinstein, The Forgotten Network: DuMont and the Birth of American Television (Philadelphia: Temple University Press, 2004) ISBN1-59213-245-6
- Alex McNeil, Total Television, Fourth edition (New York: Penguin Books, 1980)
- ISBN0-14-024916-8
- Tim Brooks and Earle Marsh, The Complete Directory to Prime Time Network TV Shows, Third edition (New York: Ballantine Books, 1964)
- ISBN0-345-31864-1
External links
This article about a non-fiction television series is a stub. You can help Wikipedia by expanding it.
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