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<a href="oauth2client-module.html">Package&nbsp;oauth2client</a> ::
Module&nbsp;util
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<h1 class="epydoc">Module util</h1><p class="nomargin-top"></p>
<pre class="literalblock">
Common utility library.
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<div class="fields"> <dl><dt>Authors:</dt>
<dd>
rafek@google.com (Rafe Kaplan),
guido@google.com (Guido van Rossum)
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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="logger"></a><span class="summary-name">logger</span> = <code title="&lt;logging.Logger instance at 0x40e8d88&gt;">&lt;logging.Logger instance at 0x40e8d88&gt;</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'.
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