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| <a href="oauth2client-module.html">Package oauth2client</a> :: |
| Module util |
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| <!-- ==================== MODULE DESCRIPTION ==================== --> |
| <h1 class="epydoc">Module util</h1><p class="nomargin-top"></p> |
| <pre class="literalblock"> |
| Common utility library. |
| |
| </pre> |
| |
| <hr /> |
| <div class="fields"> <dl><dt>Authors:</dt> |
| <dd> |
| rafek@google.com (Rafe Kaplan), |
| guido@google.com (Guido van Rossum) |
| </dd> |
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| </div><!-- ==================== FUNCTIONS ==================== --> |
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| <td><span class="summary-sig"><a href="oauth2client.util-module.html#positional" class="summary-sig-name">positional</a>(<span class="summary-sig-arg">max_positional_args</span>)</span><br /> |
| A decorator to declare that only the first N arguments my be positional.</td> |
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| <a name="FLAGS"></a><span class="summary-name">FLAGS</span> = <code title="gflags.FLAGS">gflags.FLAGS</code> |
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| <a name="__package__"></a><span class="summary-name">__package__</span> = <code title="'oauth2client'"><code class="variable-quote">'</code><code class="variable-string">oauth2client</code><code class="variable-quote">'</code></code> |
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| <a name="positional"></a> |
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| <h3 class="epydoc"><span class="sig"><span class="sig-name">positional</span>(<span class="sig-arg">max_positional_args</span>)</span> |
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| |
| <pre class="literalblock"> |
| A decorator to declare that only the first N arguments my be positional. |
| |
| This decorator makes it easy to support Python 3 style key-word only |
| parameters. For example, in Python 3 it is possible to write: |
| |
| def fn(pos1, *, kwonly1=None, kwonly1=None): |
| ... |
| |
| All named parameters after * must be a keyword: |
| |
| fn(10, 'kw1', 'kw2') # Raises exception. |
| fn(10, kwonly1='kw1') # Ok. |
| |
| Example: |
| To define a function like above, do: |
| |
| @positional(1) |
| def fn(pos1, kwonly1=None, kwonly2=None): |
| ... |
| |
| If no default value is provided to a keyword argument, it becomes a required |
| keyword argument: |
| |
| @positional(0) |
| def fn(required_kw): |
| ... |
| |
| This must be called with the keyword parameter: |
| |
| fn() # Raises exception. |
| fn(10) # Raises exception. |
| fn(required_kw=10) # Ok. |
| |
| When defining instance or class methods always remember to account for |
| 'self' and 'cls': |
| |
| class MyClass(object): |
| |
| @positional(2) |
| def my_method(self, pos1, kwonly1=None): |
| ... |
| |
| @classmethod |
| @positional(2) |
| def my_method(cls, pos1, kwonly1=None): |
| ... |
| |
| The positional decorator behavior is controlled by the |
| --positional_parameters_enforcement flag. The flag may be set to 'EXCEPTION', |
| 'WARNING' or 'IGNORE' to raise an exception, log a warning, or do nothing, |
| respectively, if a declaration is violated. |
| |
| Args: |
| max_positional_arguments: Maximum number of positional arguments. All |
| parameters after the this index must be keyword only. |
| |
| Returns: |
| A decorator that prevents using arguments after max_positional_args from |
| being used as positional parameters. |
| |
| Raises: |
| TypeError if a key-word only argument is provided as a positional parameter, |
| but only if the --positional_parameters_enforcement flag is set to |
| 'EXCEPTION'. |
| |
| </pre> |
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