mirror of https://github.com/bitcoin/bitcoin.git
73 lines
1.4 KiB
Python
Executable File
73 lines
1.4 KiB
Python
Executable File
#!/usr/bin/env python3
|
|
#
|
|
# Copyright (c) 2019-2022 The Bitcoin Core developers
|
|
# Distributed under the MIT software license, see the accompanying
|
|
# file COPYING or http://www.opensource.org/licenses/mit-license.php.
|
|
|
|
"""
|
|
Detect when a mutable list or dict is used as a default parameter value in a Python function.
|
|
"""
|
|
|
|
import subprocess
|
|
import sys
|
|
|
|
|
|
def main():
|
|
command = [
|
|
"git",
|
|
"grep",
|
|
"-E",
|
|
r"^\s*def [a-zA-Z0-9_]+\(.*=\s*(\[|\{)",
|
|
"--",
|
|
"*.py",
|
|
]
|
|
output = subprocess.run(command, stdout=subprocess.PIPE, text=True)
|
|
if len(output.stdout) > 0:
|
|
error_msg = (
|
|
"A mutable list or dict seems to be used as default parameter value:\n\n"
|
|
f"{output.stdout}\n"
|
|
f"{example()}"
|
|
)
|
|
print(error_msg)
|
|
sys.exit(1)
|
|
else:
|
|
sys.exit(0)
|
|
|
|
|
|
def example():
|
|
return """This is how mutable list and dict default parameter values behave:
|
|
|
|
>>> def f(i, j=[], k={}):
|
|
... j.append(i)
|
|
... k[i] = True
|
|
... return j, k
|
|
...
|
|
>>> f(1)
|
|
([1], {1: True})
|
|
>>> f(1)
|
|
([1, 1], {1: True})
|
|
>>> f(2)
|
|
([1, 1, 2], {1: True, 2: True})
|
|
|
|
The intended behaviour was likely:
|
|
|
|
>>> def f(i, j=None, k=None):
|
|
... if j is None:
|
|
... j = []
|
|
... if k is None:
|
|
... k = {}
|
|
... j.append(i)
|
|
... k[i] = True
|
|
... return j, k
|
|
...
|
|
>>> f(1)
|
|
([1], {1: True})
|
|
>>> f(1)
|
|
([1], {1: True})
|
|
>>> f(2)
|
|
([2], {2: True})"""
|
|
|
|
|
|
if __name__ == "__main__":
|
|
main()
|