diff options
-rwxr-xr-x | test/lint/lint-python-mutable-default-parameters.py | 72 | ||||
-rwxr-xr-x | test/lint/lint-python-mutable-default-parameters.sh | 52 |
2 files changed, 72 insertions, 52 deletions
diff --git a/test/lint/lint-python-mutable-default-parameters.py b/test/lint/lint-python-mutable-default-parameters.py new file mode 100755 index 0000000000..7991e3630b --- /dev/null +++ b/test/lint/lint-python-mutable-default-parameters.py @@ -0,0 +1,72 @@ +#!/usr/bin/env python3 +# +# Copyright (c) 2019 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, universal_newlines=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() diff --git a/test/lint/lint-python-mutable-default-parameters.sh b/test/lint/lint-python-mutable-default-parameters.sh deleted file mode 100755 index 1f9f035d30..0000000000 --- a/test/lint/lint-python-mutable-default-parameters.sh +++ /dev/null @@ -1,52 +0,0 @@ -#!/usr/bin/env bash -# -# Copyright (c) 2019 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. - -export LC_ALL=C -EXIT_CODE=0 -OUTPUT=$(git grep -E '^\s*def [a-zA-Z0-9_]+\(.*=\s*(\[|\{)' -- "*.py") -if [[ ${OUTPUT} != "" ]]; then - echo "A mutable list or dict seems to be used as default parameter value:" - echo - echo "${OUTPUT}" - echo - cat << EXAMPLE -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}) -EXAMPLE - EXIT_CODE=1 -fi -exit ${EXIT_CODE} |