You’ve fixed the bug with an elegant solution. An interesting side effect of running Python in optimized mode is that code under an explicit if __debug__: condition is also disabled. Consider the following script: Python demo.py print(f"{__debug__ = }") if __debug__: print("...
QWidget.setFixedWidth(int width) 这时候宽度就是固定的,不可以改变,但是可以改变高度。 QWidget.setFixedHeight(int height) 以下这两个函数,高度和宽度都是固定的,不可以通过鼠标来改变窗口的宽度和高度。 QWidget.setFixedSize(QSize size) QWidget.setFixedSize(int width,int height) 如果要同时改变客户区的大...
print("#1 QWidget") print("widget.x()=%d" % widget.x() ) print("widget.y()=%d" % widget.y() ) print("widget.width()=%d" % widget.width() ) print("widget.height()=%d" % widget.height() ) print("#2 QWidget.geometry") print("widget.geometry().x()=%d" % widget.geometr...
请注意,print指令是缩进的:这意味着它属于由if子句定义的作用域。执行这段代码会产生: $ python conditional.1.py I need to call my manager! 由于late是True,print语句被执行了。让我们扩展一下这个例子: # conditional.2.pylate =Falseiflate:print('I need to call my manager!')#1else:print('no nee...
Python range is one of thebuilt-in functions. When you want the for loop to run for a specific number of times, or you need to specify a range of objects to print out, the range function works really well. When working withrange(), you can pass between 1 and 3 integer arguments to...
You’re resizing the image to one-fifth of its size using the integer division operator (//). The second argument is the location in the main image where you want to paste the second picture. The tuple includes the coordinates within the main image where you want to place the top-left ...
print(point1 == point2) 输出: Point(x=3, y=2) True @dataclass装饰器应用于Point类定义之上,通知Python使用默认行为来生成特殊方法。这会自动创建__init__方法,该方法在对象实例化时初始化类属性,比如x和y。因此,可以在不需要显式编码的情况下构造像point这样的实例。此外,负责提供对象字符串表示的__repr...
Received an integer: 39 Received a float: 3.19 Received a string: Hello World! Received a sequence: [2, 4, 6] 在上面的实现中,我们先使用@singledisptach装饰器开发了泛型函数display_info(),然后分别为整数、浮点、字符串和列表注册了其实现。输出显示了display_info()针对不同数据类型的工作机理。
delimiter = [slice(i, j)for(i, j)inzip(idx[:-1], idx[1:])]# Delimiter is a singleintegerelifint(delimiter): (_handyman, delimiter) = ( self._fixedwidth_splitter, int(delimiter))else: (_handyman, delimiter) = (self._delimited_splitter,None) ...
如果您在 Python 的Read-Eval-Print-Loop(REPL)中尝试使用 PyQt,请通过传入一个包含单个空字符串的列表来创建QApplication对象,就像这样:QtWidgets.QApplication(['']);否则,Qt 会崩溃。此外,在 REPL 中不需要调用QApplication.exec(),这要归功于一些特殊的 PyQt 魔法。