inspect2

0.1.2 verified Fri May 01 auth: no python maintenance

Backport of Python 3.6's inspect module to Python 2.7–3.5. Provides the signature() function and other inspection features missing in older Python versions. Current version 0.1.2, low activity.

pip install inspect2

Common errors

error ImportError: cannot import name 'signature' from 'inspect' ↓

cause Python <3.4 has no inspect.signature, or Python 2.7's inspect does not have signature.

fix

Install inspect2 and use 'from inspect2 import signature'.

error TypeError: signature() got an unexpected keyword argument 'follow_wrapped' ↓

cause inspect2 version 0.1.2 does not support follow_wrapped parameter (Python 3.5+).

fix

Omit follow_wrapped or upgrade to Python 3.6+ to use inspect.signature.

Warnings

deprecated inspect2 is only needed for Python 2.7–3.5. Python 3.6+ natively includes inspect.signature; using inspect2 on Python 3.6+ may cause import conflicts. ↓

fix Use standard library 'inspect' on Python 3.6+.

gotcha inspect2 does not override the built-in inspect module. You must explicitly import from inspect2. ↓

fix Use 'from inspect2 import ...' instead of relying on inspect being patched.

Imports

signature
wrong
```
from inspect import signature
```
correct
```
from inspect2 import signature
```
Python <3.4 has no inspect.signature; use inspect2 for backport.

Quickstart

Use inspect2.signature to get callable signatures on Python 2.7–3.5.

from inspect2 import signature

def foo(a, b=1):
    return a + b

sig = signature(foo)
print(sig.parameters['a'].default is None)
print(sig.parameters['b'].default)