设置label中的对齐方式

QLabel.setAlignment (self, Qt.Alignment)

下面查看Qt.Alignment：

Qt.AlignmentFlag

This enum type is used to describe alignment. It contains horizontal and vertical flags that can be combined to produce the required effect.

The TextElideMode enum can also be used in many situations to fine-tune the appearance of aligned text.

The horizontal flags are:

Constant	Value	Description
Qt.AlignLeft	0x0001	Aligns with the left edge.
Qt.AlignRight	0x0002	Aligns with the right edge.
Qt.AlignHCenter	0x0004	Centers horizontally in the available space.
Qt.AlignJustify	0x0008	Justifies the text in the available space.

The vertical flags are:

Constant	Value	Description
Qt.AlignTop	0x0020	Aligns with the top.
Qt.AlignBottom	0x0040	Aligns with the bottom.
Qt.AlignVCenter	0x0080	Centers vertically in the available space.

You can use only one of the horizontal flags at a time. There is one two-dimensional flag:

Constant	Value	Description
Qt.AlignCenter	AlignVCenter | AlignHCenter	Centers in both dimensions.

You can use at most one horizontal and one vertical flag at a time. Qt.AlignCenter counts as both horizontal and vertical.

Three enum values are useful in applications that can be run in right-to-left mode:

Constant	Value	Description
Qt.AlignAbsolute	0x0010	If the widget's layout direction is Qt.RightToLeft (instead of Qt.LeftToRight, the default), Qt.AlignLeft refers to the right edge and Qt.AlignRight to the left edge. This is normally the desired behavior. If you want Qt.AlignLeft to always mean "left" and Qt.AlignRight to always mean "right", combine the flag with Qt.AlignAbsolute.
Qt.AlignLeading	AlignLeft	Synonym for Qt.AlignLeft.
Qt.AlignTrailing	AlignRight	Synonym for Qt.AlignRight.

Masks:

Constant	Value
Qt.AlignHorizontal_Mask	AlignLeft | AlignRight | AlignHCenter | AlignJustify | AlignAbsolute
Qt.AlignVertical_Mask	AlignTop | AlignBottom | AlignVCenter

Conflicting combinations of flags have undefined meanings.

The Alignment type is a typedef for QFlags<AlignmentFlag>. It stores an OR combination of AlignmentFlag values.

简单示范：

self.label.setAlignment(Qt.AlignLeft)