Question

我尝试使用mypy来检查PyQt5应用程序的代码。但我发现它不会检查我定义的widget类中的代码。我写了一个小的示例应用程序，以找出检查的内容和不检查的内容。

from PyQt5.QtWidgets import QApplication, QWidget, QPushButton, QGridLayout, \
    QSpinBox, QLabel


def add_numbers(a: str, b: str) -> str:
    return a + b


def add_numbers2(a: str, b: int) -> int:
    return a + b  # found: unsupported operand int + str


class MyWidget(QWidget):

    def __init__(self, parent=None):
        super().__init__(parent)

        add_numbers(1, 2)  # not found: should result in incompatible type error

        self.a_label = QLabel('a:')
        self.a_spinbox = QSpinBox()
        self.b_label = QLabel('b:')
        self.b_spinbox = QSpinBox()
        self.c_label = QLabel('c:')
        self.c_spinbox = QSpinBox()
        self.button = QPushButton('a + b')

        layout = QGridLayout()
        layout.addWidget(self.a_label, 0, 0)
        layout.addWidget(self.a_spinbox, 0, 1)
        layout.addWidget(self.b_label, 1, 0)
        layout.addWidget(self.b_spinbox, 1, 1)
        layout.addWidget(self.button, 2, 1)
        layout.addWidget(self.c_label, 3, 0)
        layout.addWidget(self.c_spinbox, 3, 1)
        self.setLayout(layout)

        self.button.clicked.connect(self.add_numbers)

    def add_numbers(self):
        a = self.a_spinbox.value()
        b = self.b_spinbox.value()
        c = add_numbers(a, b)  # not found: should result in incompatible type error
        self.c_spinbox.setValue(c)


if __name__ == '__main__':
    add_numbers(1, 2)  # found: incompatible type found by mypy
    app = QApplication([])
    w = MyWidget()
    w.show()
    app.exec_()

如果我运行mypy，我会得到以下输出：

$ mypy --ignore-missing-imports --follow-imports=skip test.py
test.py:10: error: Unsupported operand types for + ("str" and "int")
test.py:48: error: Argument 1 to "add_numbers" has incompatible type "int"; 
expected "str"
test.py:48: error: Argument 2 to "add_numbers" has incompatible type "int"; 
expected "str"

Mypy发现了add_numbers2()中的类型错误以及主要部分中我尝试将两个整数传递给函数add_numbers()的错误，该函数仅将字符串作为参数。但由于某种原因，MyWidget.add_number()和__init__()函数中的错误已被跳过。 mypy会忽略MyWidget()类中的所有内容。有人知道如何让mypy完全检查代码吗？

Answer 1

默认情况下，mypy不会检查未注释的方法。要么为它们添加类型注释，要么使用--check-untyped-defs调用它。

如何用mypy键入检查PyQt5应用程序？

1 个答案: