pylint/flake8 linter check equivalent to "name 'x' can be undefined" and "local variable 'x' might be referenced before assignment" in PyCharm

When viewing the following Python code in PyCharm, PyCharm will report a helpful warning Name 'x' may be undefined:

condition = False

if condition:
    x = "foo"

print(x)

And with this code, PyCharm will report Local variable 'x' might be referenced before assignment:

def func():
    condition = False
    if condition:
        x = "foo"
    print(x)

Performing linting checks with pylint (2.6.0) and flake8 (3.8.3) won't report any errors on this code.

However detecting this problem in CI can prevent serious bugs hitting production.

How can I detect this problem without PyCharm (or PyCharm inspect.sh), are there any plugins available for flake8/pylint I'm missing?