我该如何评价
a = myobject.id.number
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如果myobject是,则返回None None
内置getattr?也许getattr(myobject, "id.number", None)?
我有4个python列表,其中包含2个项目的内部列表:
a = [[1,2], [3,4], ...]
b = [[5,2], [2,4], ...]
c = [[7,2], [5,4], ...]
d = [[8,2], [4,4], ...]
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我可以像这样连续地对内部列表求和:
for list in [a,b,c,d]:
total = 0
for [x,y] in list:
total += x + y
print("total is: ", total)
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假设每个列表的每个求和操作需要5秒钟,因此连续累加4个列表将需要20秒。
如果使用multiprocessing,是否可以同时对4个列表求和,而所有4个求和操作将仅需5秒而不是20秒?
我的字符串是:
"This is a string"
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我想把它变成一个列表:
["This", "is", "a", "string"]
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我使用该split(" ")方法,但它添加了空格作为列表元素.请帮忙,
最好的祝福
在Linux环境中,我想创建一个文件并在其中写入文本:
HTMLFILE: "$MYUSER/OUTPUT/myfolder/mytext.html"
f = open(HTMLFILE, 'w')
IOError: [Errno 2] No such file or directory: "$MYUSER/OUTPUT/myfolder/mytext.html"
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我有读/写权限做"$ MYUSER/OUTPUT/myfolder /"目录.
为什么我会收到此错误?为什么不创建mytext.html文件?
我有一份清单清单:
[[1,2], [1,2,4], [1,2,3,4], [4,5,6], [1,9], [1,2,4]]
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我想以下列格式获取列表统计信息:
number of lists with 2 elements : 2
number of lists with 3 elements : 3
number of lists with 4 elements : 1
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这样做的最好(最pythonic)方式是什么?
您能否解释一下“返回0”和“返回”之间的区别?例如:
do_1():
for i in xrange(5):
do_sth()
return 0
do_2():
for i in xrange(5):
do_sth()
return
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上面两个功能有什么区别?
以下代码将单元格设置为只读,但如何在 wx.grid 中将整个行/列(例如第 3 列)设置为只读?
import wx.grid as gridlib
myGrid = gridlib.Grid(panel)
myGrid.SetReadOnly(3, 3, True)
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import wx
import wx.grid as gridlib
########################################################################
class MyForm(wx.Frame):
""""""
#----------------------------------------------------------------------
def __init__(self):
"""Constructor"""
wx.Frame.__init__(self, parent=None, title="A Simple Grid")
panel = wx.Panel(self)
myGrid = gridlib.Grid(panel)
myGrid.CreateGrid(12, 8)
sizer = wx.BoxSizer(wx.VERTICAL)
sizer.Add(myGrid, 1, wx.EXPAND)
panel.SetSizer(sizer)
if __name__ == "__main__":
app = wx.PySimpleApp()
frame = MyForm().Show()
app.MainLoop()
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但是我想设置自定义列标题:

这该怎么做?
我有一个wx.grid表,当我将鼠标悬停在一个单元格上时,我想设置一个工具提示,我在下面尝试了Mike Driscoll的推荐,它可以工作,但是我不能用鼠标拖动选择多个单元格,它允许我只选择最多1个单元格,请帮助:
self.grid_area.GetGridWindow().Bind(wx.EVT_MOTION, self.onMouseOver)
def onMouseOver(self, event):
'''
Method to calculate where the mouse is pointing and
then set the tooltip dynamically.
'''
# Use CalcUnscrolledPosition() to get the mouse position
# within the
# entire grid including what's offscreen
x, y = self.grid_area.CalcUnscrolledPosition(event.GetX(),event.GetY())
coords = self.grid_area.XYToCell(x, y)
# you only need these if you need the value in the cell
row = coords[0]
col = coords[1]
if self.grid_area.GetCellValue(row, col):
if self.grid_area.GetCellValue(row, col) == "ABC":
event.GetEventObject().SetToolTipString("Code is abc")
elif self.grid_area.GetCellValue(row, …Run Code Online (Sandbox Code Playgroud) page_name在NotebookPage下面创建对象时如何传递额外的参数" " ?我收到以下错误:
class NotebookPage(wx.Panel):
def __init__(self, *args, **kwargs):
wx.Panel.__init__(self, *args, **kwargs)
NotebookPage(self, name='NotebookPage0', page_name=page)
TypeError: 'page_name' is an invalid keyword argument for this function
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我需要page_name在创建NotebookPage对象时传递参数.但由于page_name不是一个有效的论据wx.Panel,我得到了这个错误.
python ×9
wxpython ×3
function ×2
grid ×2
list ×2
object ×2
arguments ×1
attributes ×1
file ×1
header ×1
linux ×1
mousehover ×1
readonly ×1
return ×1
row ×1
statistics ×1
string ×1
tooltip ×1
whitespace ×1