range

问题 for n in range(2,5): for x in range(2,n): print(n,x) Gives output as: 3 2 4 2 4 3 why the value of n start from 3 not 2? 回答1: n starts at three because range(2, 2) is empty. Maybe you really want: for n in range(2, 5): for x in range(2, n + 1): print(n, x) Results: 2 2 3 2 3 3 4 2 4 3 4 4 来源： https://stackoverflow.com/questions/50575700/range-function-in-python

问题 for n in range(2,5): for x in range(2,n): print(n,x) Gives output as: 3 2 4 2 4 3 why the value of n start from 3 not 2? 回答1: n starts at three because range(2, 2) is empty. Maybe you really want: for n in range(2, 5): for x in range(2, n + 1): print(n, x) Results: 2 2 3 2 3 3 4 2 4 3 4 4 来源： https://stackoverflow.com/questions/50575700/range-function-in-python

问题 this happens in chrome (71.0.3578.80 on windows): on range.setStart the caret moves to the reference node, but after typing the new characters appear in the node before, when offset is 0. the expected behaviour would be, that the characters appear in the reference node of range.setStart. see here: http://jsfiddle.net/pgrds9qv/ function setCaret() { var el = document.getElementById("editable"); var range = document.createRange(); var sel = window.getSelection(); range.setStart(el.childNodes[2]

问题 So I need to localize this [Range(1, 150, ErrorMessage = "")] I tried to use [Range(1, 150, ErrorMessage = MyApp.Properties.Resource.ErrorMessageMustBeBetween)] where MyApp.Properties.Resource.ErrorMessageMustBeBetween is "{0} must be between {1} and {2}." and it says An attribute argument must be a constant expression, typeof expression or array creation expression of an attribute parameter type How it could be done then? Thank you! 回答1: You need to use ErrorMessageResourceType and

问题 Using comtypes to drive Python, it seems some magic is happening behind the scenes that is not converting tuples and lists to VARIANT types: # RANGE(“C14:D21”) has values # Setting the Value on the Range with a Variant should work, but # list or tuple is not getting converted properly it seems >>>from comtypes.client import CreateObject >>>xl = CreateObject("Excel.application") >>>xl.Workbooks.Open(r'C:\temp\my_file.xlsx') >>>xl.Visible = True >>>vals=tuple([(x,y) for x,y in zip('abcdefgh'

问题 Using comtypes to drive Python, it seems some magic is happening behind the scenes that is not converting tuples and lists to VARIANT types: # RANGE(“C14:D21”) has values # Setting the Value on the Range with a Variant should work, but # list or tuple is not getting converted properly it seems >>>from comtypes.client import CreateObject >>>xl = CreateObject("Excel.application") >>>xl.Workbooks.Open(r'C:\temp\my_file.xlsx') >>>xl.Visible = True >>>vals=tuple([(x,y) for x,y in zip('abcdefgh'

问题 Using comtypes to drive Python, it seems some magic is happening behind the scenes that is not converting tuples and lists to VARIANT types: # RANGE(“C14:D21”) has values # Setting the Value on the Range with a Variant should work, but # list or tuple is not getting converted properly it seems >>>from comtypes.client import CreateObject >>>xl = CreateObject("Excel.application") >>>xl.Workbooks.Open(r'C:\temp\my_file.xlsx') >>>xl.Visible = True >>>vals=tuple([(x,y) for x,y in zip('abcdefgh'

问题 Using comtypes to drive Python, it seems some magic is happening behind the scenes that is not converting tuples and lists to VARIANT types: # RANGE(“C14:D21”) has values # Setting the Value on the Range with a Variant should work, but # list or tuple is not getting converted properly it seems >>>from comtypes.client import CreateObject >>>xl = CreateObject("Excel.application") >>>xl.Workbooks.Open(r'C:\temp\my_file.xlsx') >>>xl.Visible = True >>>vals=tuple([(x,y) for x,y in zip('abcdefgh'

问题 Say I want to loop from 0 to 100 but with a step of 1/2. If you try for i in range(0, 100, 0.5): whatever Error: the step must not be 0 Question: Is there any built-in way in Python 2.x to do something like this? 回答1: Python2.x: for idx in range(0, int(100 / 0.5)): print 0.5 * idx outputs: 0.0 0.5 1.0 1.5 .. 99.0 99.5 Numpy: numpy.arange would also do the trick. numpy.arange(0, 100, 0.5) 回答2: If you have numpy , here are two ways to do it: numpy.arange(0, 100, 0.5) numpy.linspace(0, 100, 200,

问题 When trying to add int array keys of a map to a slice of int slices, ranging and using arr[:] to slice array doesn't work as expected. The resultant slice contains only duplicates of the "first" key in the map(commented out for loop). However, copying the array key to another variable and slicing the new variable works, and the resultant slice contains distinct map key values. I wonder why the copying is necessary. Isn't k , the array key, copied from the map as a new array at each iteration?