Introspection in Python

Asking an object about itself: signature, docstring, source, members.

import inspect


def score(tpm: float, target: float = 90.0, *, strict: bool = False) -> int:
    """Stars for a run."""
    return 3 if tpm >= target else 1


signature = inspect.signature(score)
print(signature)
print([p.name for p in signature.parameters.values()])
print(signature.parameters["target"].default)
print(inspect.getdoc(score))
print(len(inspect.getsource(score).splitlines()))

How it works

1. signature reads the parameters and their defaults.
2. getdoc returns the docstring, cleaned up.
3. getsource returns the code, when it is available.

Keywords and builtins used here

• bool
• def
• else
• float
• for
• if
• int
• len
• print
• return
• score

The run, in numbers

Lines

14

Characters to type

385

Tokens

105

Three-star pace

110 tpm

At the three-star pace of 110 tokens a minute, this run takes about 57 seconds.

Type this snippet

Step 2 of 4 in Measuring & introspecting, step 36 of 41 in Domain tools.

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