joke2k / faker / 3095
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Add unique values support

* 🦄 Add unique values support to Faker

Adds support to Faker for guaranteed unique values.

A new `.unique` property has been added to the Proxy class, which
returns an instance of a `UniqueProxy`. Any attributes looked up on the
unique proxy goes to the common proxy. If the attribute is a function,
then it's wrapped with a wrapper that only allows unique values.

Obviously, it's not always possible to get a unique value, especially
with a small set of values. If the wrapper can't find a unique value
after a certain number of attempts (currently pegged at an arbitrary
1000), it throws a UniquenessSanityException.

Each "remembered" set of values is tied to the name of the function, and
the arguments passed to it, so, for example, different `.random_int()`
calls with different arguments will not share a "bucket".

Since it uses a set internally for remembering previous values, and a
dictionary for determining what bucket to use, it can't be used with any
arguments or return values that are unhashable.

* 🐑 Fix flake8 linting

Trim some unused imports, add some set literals, add some line breaks.
Makes changes as required to pass flake8

* ⚠️ Changed exception name; fallback behaviour

- The exception that the unique wrapper throws after too many iterations
  is now called `UniquenessException`, and also includes an error
  message explaining how many iterations were attempted.

- Accessing a non-callable through the `.unique` attribute now throws a
  TypeError.

* 📦 Fix accidental unpacking of arguments in key

The key for looking up previously generated values of a specific
invocation of a function accidentally unpacked the arguments of `args`,
making key a variable length tuple.

This commit fixes that mistake, so the keys are now consistently
3-tuples.

* 📄 Add documentation for .unique attribute

First pass at documentation for the .unique attribute.

* 📄 Tweak documentati... (continued)

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Jobs
ID Job ID Ran Files Coverage
1 3095.1 (TOXENV=flake8) 0
0.0
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2 3095.2 (TOXENV=checkmanifest) 0
0.0
 Travis Job 3095.2
3 3095.3 (TOXENV=isort) 0
0.0
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4 3095.4 (TOXENV=py35) 0
98.63
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5 3095.5 (TOXENV=py36) 0
98.66
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6 3095.6 (TOXENV=py37) 0
98.65
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7 3095.7 (TOXENV=py38) 0
98.68
 Travis Job 3095.7
8 3095.8 (TOXENV=pypy3) 0
98.62
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9 3095.9 (TOXENV=32bit TEST_32BIT=1) 0
0.0
 Travis Job 3095.9
Source Files on build 3095
Detailed source file information is not available for this build.