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@ -161,13 +161,14 @@ Import each module using the full pathname location of the module.
<a id="s2.3.1-pros"></a>
#### 2.3.1 Pros
Avoids conflicts in module names. Makes it easier to find modules.
Avoids conflicts in module names or incorrect imports due to the module search
path not being what the author expected. Makes it easier to find modules.
<a id="S2.3.2-cons"></a>
#### 2.3.2 Cons
Makes it harder to deploy code because you have to replicate the package
hierarchy.
hierarchy. Not really a problem with modern deployment mechanisms.
<a id="s2.3.3-decision"></a>
#### 2.3.3 Decision
@ -176,14 +177,38 @@ All new code should import each module by its full package name.
Imports should be as follows:
```python
# Reference in code with complete name.
import absl.flags
Yes:
# Reference in code with just module name (preferred).
from absl import flags
```python
# Reference absl.flags in code with the complete name (verbose).
import absl.flags
from doctor.who import jodie
FLAGS = absl.flags.FLAGS
```
```python
# Reference flags in code with just the module name (common).
from absl import flags
from doctor.who import jodie
FLAGS = flags.FLAGS
```
No: _(assume this file lives in `doctor/who/` where `jodie.py` also exists)_
```python
# Unclear what module the author wanted and what will be imported. The actual
# import behavior depends on external factors controlling sys.path.
# Which possible jodie module did the author intend to import?
import jodie
```
The directory the main binary is located in should not be assumed to be in
`sys.path` despite that happening in some environments. This being the case,
code should assume that `import jodie` refers to a third party or top level
package named `jodie`, not a local `jodie.py`.
<a id="s2.4-exceptions"></a>
<a id="exceptions"></a>
### 2.4 Exceptions
@ -1049,7 +1074,7 @@ and `enum`).
<a id="s2.20-modern-python"></a>
<a id="modern-python"></a>
### 2.20 Modern Python: Python 3 and from \_\_future\_\_ imports {#modern-python}
### 2.20 Modern Python: Python 3 and from \_\_future\_\_ imports
Python 3 is here! While not every project is ready to
use it yet, all code should be written to be 3 compatible (and tested under
@ -1385,8 +1410,8 @@ No: golomb4 = [
Two blank lines between top-level definitions, be they function or class
definitions. One blank line between method definitions and between the `class`
line and the first method. Use single blank lines as you judge appropriate
within functions or methods.
line and the first method. No blank line following a `def` line. Use single
blank lines as you judge appropriate within functions or methods.
<a id="s3.6-whitespace"></a>
<a id="whitespace"></a>
@ -1572,24 +1597,27 @@ Certain aspects of a function should be documented in special sections, listed
below. Each section begins with a heading line, which ends with a colon.
Sections should be indented two spaces, except for the heading.
[*Args:*](#doc-function-args) {#doc-function-args}
<a id="doc-function-args"></a>
[*Args:*](#doc-function-args)
: List each parameter by name. A description should follow the name, and be
: separated by a colon and a space. If the description is too long to fit on a
: single 80-character line, use a hanging indent of 2 or 4 spaces (be
: consistent with the rest of the file).<br/>
: The description should include required type(s) if the code does not contain
: a corresponding type annotation.<br/>
: If a function accepts `*foo` (variable length argument lists) and/or `**bar`
: (arbitrary keyword arguments), they should be listed as `*foo` and `**bar`.
separated by a colon and a space. If the description is too long to fit on a
single 80-character line, use a hanging indent of 2 or 4 spaces (be
consistent with the rest of the file).<br>
The description should include required type(s) if the code does not contain
a corresponding type annotation.<br>
If a function accepts `*foo` (variable length argument lists) and/or `**bar`
(arbitrary keyword arguments), they should be listed as `*foo` and `**bar`.
[*Returns:* (or *Yields:* for generators)](#doc-function-returns) {#doc-function-returns}
<a id="doc-function-returns"></a>
[*Returns:* (or *Yields:* for generators)](#doc-function-returns)
: Describe the type and semantics of the return value. If the function only
: returns None, this section is not required. It may also be omitted if the
: docstring starts with Returns (or Yields) (e.g.
: `"""Returns row from Bigtable as a tuple of strings."""`) and the opening
: sentence is sufficient to describe return value.
returns None, this section is not required. It may also be omitted if the
docstring starts with Returns or Yields (e.g.
`"""Returns row from Bigtable as a tuple of strings."""`) and the opening
sentence is sufficient to describe return value.
[*Raises:*](#doc-function-raises) {#doc-function-raises}
<a id="doc-function-raises"></a>
[*Raises:*](#doc-function-raises)
: List all exceptions that are relevant to the interface.
```python
@ -2098,7 +2126,7 @@ Always use a `.py` filename extension. Never use dashes.
<a id="s3.16.3-file-naming"></a>
<a id="file-naming"></a>
#### 3.16.3 File Naming {#s3.16.3-file-naming}
#### 3.16.3 File Naming
Python filenames must have a `.py` extension and must not contain dashes (`-`).
This allows them to be imported and unittested. If you want an executable to be
@ -2422,14 +2450,14 @@ def implicit_optional(a: Text = None) -> Text:
#### 3.19.6 Type Aliases
You can declare aliases of complex types. The name of an alias should be
CapWorded; try to describe the composed type and end with "Type" (or "Types" for
returned tuples). If the alias is used only in this module, it should be
CapWorded. If the alias is used only in this module, it should be
\_Private.
For example, if the name of module together with the type is too long:
```python
SomeType = module_with_long_name.TypeWithLongName
_ShortName = module_with_long_name.TypeWithLongName
ComplexMap = Mapping[Text, List[Tuple[int, int]]]
```
Other examples are complex nested types and multiple return variables from a