builtin-variable-shadowing (A001) (内置变量遮蔽 (A001))
派生自 flake8-builtins linter。
作用
Checks for variable (and function) assignments that use the same names as builtins. (检查使用与内置函数相同名称的变量(和函数)赋值。)
为什么这不好?
Reusing a builtin name for the name of a variable increases the difficulty of reading and maintaining the code, and can cause non-obvious errors, as readers may mistake the variable for the builtin and vice versa. (将内置名称重新用于变量名称会增加阅读和维护代码的难度,并可能导致不明显的错误,因为读者可能会将变量误认为是内置函数,反之亦然。)
可以通过 lint.flake8-builtins.ignorelist
配置选项将内置函数标记为此规则的例外。
示例
def find_max(list_of_lists):
max = 0
for flat_list in list_of_lists:
for value in flat_list:
max = max(max, value) # TypeError: 'int' object is not callable
return max
建议改为
def find_max(list_of_lists):
result = 0
for flat_list in list_of_lists:
for value in flat_list:
result = max(result, value)
return result