我有这个Tkinter的东西用Python 3.5。我正在尝试将一个入口盒的内容传递给另一个模块，以便我可以用它做其他事情。我正在制作像这样的Tkinter窗口：
import tkinter as tk
class GUI(tk.Tk):
def __init__(self):
tk.Tk.__init__(self)
tk.Label(self,text="Testers Name").grid()
self.testers_name = tk.Entry(self,text="Testers Name").grid()
tk.Label(self,text="Report Name").grid()
self.report_name = tk.Entry(self,text="Report Name").grid()
submitButton = tk.Button(self, text="Test Selected",command=self.query_checkbuttons)
submitButton.grid()
def query_checkbuttons(self):
some_stuff_blah_blah_blah
if __name__ == "__main__":
gui = GUI()
print(gui.report_name)
gui.mainloop()
所以，这很好用。至少print次__main__次来电报None，而不是错误。
我有另一个名为pdf.py的模块，当我尝试像这样引入report_name时，其中有一个调用失败：
def myFirstPage(canvas, doc):
import gui
print(gui.report_name)
canvas.saveState()
canvas.setFont('Times-Bold',16)
canvas.drawCentredString(PAGE_WIDTH/2.0, PAGE_HEIGHT-108, Title)
canvas.setFont('Times-Roman',9)
canvas.drawString(inch, 0.75 * inch, "First Page / %s" % pageinfo)
canvas.restoreState()
我已经尝试了我能想到的一切。我们来看看，怎么样：
print(gui.gui.report_name)
print(gui.report_name)
print(gui.report_name.get())
print(gui.GUI.report_name)
print(gui.GUI().report_name)
print(gui.GUI().report_name.get())
我在gui电话中进行了全局__main__。
我在pdf.py中的各个地方都这样做了：
import gui
from gui import *
from gui import gui
from gui import GUI
结合最后一批电话的排列......没有任何作用。
我可以在自己的模块中打印它，但我不能让它在那里出现。我该怎么做？
答案 0 :(得分：2)
不完全确定，但我猜您的问题与以下行有关
public class OrderViewListAdapter extends ArrayAdapter<OrderItemList> {
public OrderViewListAdapter(Context context, int resource) {
super(context, resource);
}
private class ViewHolder {
TextView sku_desc;
TextView uom_desc;
EditText order_qty;
ImageButton plus;
ImageButton minus;
AutoCompleteTextView uom;
}
@Override
public View getView(final int position, View convertView, ViewGroup parent) {
// Get the data item for this position
OrderItemList vehicleTransit = mDataSet.get(position);
//System.out.println("kamal123" +mDataSet.get(position).getOrderID());
System.out.println("kamal123" +position);
ViewHolder viewHolder;
if (convertView == null) {
viewHolder = new ViewHolder();
LayoutInflater inflater = LayoutInflater.from(getContext());
convertView = inflater.inflate(R.layout.list_item_selector, parent, false);
viewHolder.sku_desc = (TextView) convertView.findViewById(R.id
.item_name);
viewHolder.uom_desc = (TextView) convertView.findViewById(R.id
.uom_desc);
viewHolder.order_qty = (EditText) convertView.findViewById(R.id.number_of_item);
viewHolder.plus= (ImageButton)convertView.findViewById(R.id.button_plus) ;
viewHolder.minus= (ImageButton)convertView.findViewById(R.id.button_minus) ;
convertView.setTag(viewHolder);
viewHolder.plus.setTag(viewHolder);
viewHolder.minus.setTag(viewHolder);
viewHolder.order_qty.setTag(viewHolder);
} else {
viewHolder = (ViewHolder) convertView.getTag();
}
if(vehicleTransit!= null) {
System.out.println("kamal123" + vehicleTransit.getExpectedDeliveryDate()
.toString());
if (vehicleTransit.getExpectedDeliveryDate() != null) {
viewHolder.uom_desc.setText(vehicleTransit.getUOMDesc()
.toString());
System.out.println("kamal123" +vehicleTransit.getExpectedDeliveryDate()
.toString());
}if (vehicleTransit.getSkuDesc() != null) {
viewHolder.sku_desc.setText(vehicleTransit.getSkuDesc().toString());
}
viewHolder.order_qty.setText(vehicleTransit.getOrderQty()+"");
viewHolder.order_qty.setId(position);
}
viewHolder.plus.setOnClickListener(new View.OnClickListener() {
int count=0;
@Override
public void onClick(View v) {
View p = (View) v.getParent();
ViewHolder holder1 = (ViewHolder) v.getTag();
count = Integer.valueOf(holder1.order_qty.getText().toString());
count++;
holder1.order_qty.setText(String.valueOf(count));
mDataSet.get(position).setOrderQty(count);
//mAdapter.notifyDataSetChanged();
}
});
viewHolder.minus.setOnClickListener(new View.OnClickListener() {
int count=0;
@Override
public void onClick(View v) {
View p = (View) v.getParent();
ViewHolder holder1 = (ViewHolder) v.getTag();
count = Integer.valueOf(holder1.order_qty.getText().toString());
count--;
if(count>=0)
{holder1.order_qty.setText(String.valueOf(count));
mDataSet.get(position).setOrderQty(count);
//mAdapter.notifyDataSetChanged();
}
}
});
//we need to update adapter once we finish with editing
viewHolder.order_qty.setOnFocusChangeListener(new View.OnFocusChangeListener() {
int count=0;
public void onFocusChange(View v, boolean hasFocus) {
if (!hasFocus){
View p = (View) v.getParent();
ViewHolder holder1 = (ViewHolder) v.getTag();
final int position = holder1.order_qty.getId();
count = Integer.valueOf(holder1.order_qty.getText().toString());
if(count>0)
{holder1.order_qty.setText(String.valueOf(count));
mDataSet.get(position).setOrderQty(count);
//mAdapter.notifyDataSetChanged();
}
}
}
});
/*viewHolder.order_qty.addTextChangedListener(new TextWatcher() {
int count=0;
@Override
public void onTextChanged(CharSequence s, int start, int before, int count) {
// TODO Auto-generated method stub
}
@Override
public void beforeTextChanged(CharSequence s, int start, int count,
int after) {
// TODO Auto-generated method stub
}
@Override
public void afterTextChanged(Editable s) {
// TODO Auto-generated method stub
count = Integer.valueOf(s.toString());
mDataSet.get(position).setOrderQty(count);
}
});*/
return convertView;
}
@Override
public int getCount() {
return mDataSet.size();
}
}
意味着您的类if __name__ == "__main__":
未被实例化，如[0]中所示。移动GUI类的创建，即使用以下代码段
GUI至少允许您从该模块导入变量import tkinter as tk
class GUI(tk.Tk):
def __init__(self):
tk.Tk.__init__(self)
tk.Label(self,text="Testers Name").grid()
self.testers_name = tk.Entry(self,text="Testers Name").grid()
tk.Label(self,text="Report Name").grid()
self.report_name = tk.Entry(self,text="Report Name").grid()
submitButton = tk.Button(self, text="Test Selected",command=self.query_checkbuttons)
submitButton.grid()
def query_checkbuttons(self):
some_stuff_blah_blah_blah
gui = GUI()
print(gui.report_name)
gui.mainloop()
。
但是，我强烈建议不要在模块末尾实例化类，因为每次导入该模块时都会重新实例化它！
<强> EDIT1：
我会这样做：
gui
thiscode.py然后在import tkinter as tk
class GUI(tk.Tk):
def __init__(self):
tk.Tk.__init__(self)
tk.Label(self,text="Testers Name").grid()
self.testers_name = tk.Entry(self,text="Testers Name").grid()
tk.Label(self,text="Report Name").grid()
self.report_name = tk.Entry(self,text="Report Name").grid()
submitButton = tk.Button(self, text="Test Selected",command=self.query_checkbuttons)
submitButton.grid()
def query_checkbuttons(self):
some_stuff_blah_blah_blah
def start_gui():
gui = GUI()
# print(gui.report_name)
gui.mainloop()
if __name__ == "__main__":
start_gui()
pdf.py现在让我澄清一下，当您通过def myFirstPage(canvas, doc):
import gui
gui.start_gui() # --> manually open up the gui after import <--
# print(gui.report_name)
canvas.saveState()
canvas.setFont('Times-Bold',16)
canvas.drawCentredString(PAGE_WIDTH/2.0, PAGE_HEIGHT-108, Title)
canvas.setFont('Times-Roman',9)
canvas.drawString(inch, 0.75 * inch, "First Page / %s" % pageinfo)
canvas.restoreState()
致电thiscode.py时，您最终会打开一个GUI。但是，如果您导入模块就不是这种情况，如python thiscode.py中所示。因此，我们通过函数调用直接实例化一个GUI对象，这必须手动完成（参见第3行，pdf.py中有明确无误的内联注释）。
[0] https://docs.python.org/3/tutorial/modules.html#executing-modules-as-scripts
答案 1 :(得分：1)
public void enqueue(String item) {
Node newNode = new Node();
newNode.item = item;
if(isEmpty()){
first = newNode; last = newNode;
return;
}
this.last.next = newNode;
this.last = newNode;
}
块的重点是仅在直接运行该文件时执行其内容，而不是在导入时执行。因此，如果您执行想要导入Node oldlast = new Node();
oldlast.item = String(last.item);
实例，则不应在该块中创建它。