boolean

问题 So I'm trying to find indirect relations in a dictionary but I can't seem to find a general code for my program: this is what I have #find if A is related to E data = {"A": {"B": 5, "C": 7}, "B": {"E": 8}, "C": {}, "D": {}, "E": {"D": 9}} if "E" in data["A"]: result = True if "E" in data["B"] or "D" in data["C"]: result = True else: result = False print(result) #output = True because "E" is in data["A"] For this one example it works and ofcourse I've could generalize this with x's and y's but

问题 So I'm trying to find indirect relations in a dictionary but I can't seem to find a general code for my program: this is what I have #find if A is related to E data = {"A": {"B": 5, "C": 7}, "B": {"E": 8}, "C": {}, "D": {}, "E": {"D": 9}} if "E" in data["A"]: result = True if "E" in data["B"] or "D" in data["C"]: result = True else: result = False print(result) #output = True because "E" is in data["A"] For this one example it works and ofcourse I've could generalize this with x's and y's but

问题 How to convert true false values in Dataframe as 1 for true and 0 for false COL1 COL2 COL3 COL4 12 TRUE 14 FALSE 13 FALSE 13 TRUE OUTPUT 12 1 14 0 13 0 13 1 回答1: First, if you have the strings 'TRUE' and 'FALSE' , you can convert those to boolean True and False values like this: df['COL2'] == 'TRUE' That gives you a bool column. You can use astype to convert to int (because bool is an integral type, where True means 1 and False means 0 , which is exactly what you want): (df['COL2'] == 'TRUE')

问题 How to convert true false values in Dataframe as 1 for true and 0 for false COL1 COL2 COL3 COL4 12 TRUE 14 FALSE 13 FALSE 13 TRUE OUTPUT 12 1 14 0 13 0 13 1 回答1: First, if you have the strings 'TRUE' and 'FALSE' , you can convert those to boolean True and False values like this: df['COL2'] == 'TRUE' That gives you a bool column. You can use astype to convert to int (because bool is an integral type, where True means 1 and False means 0 , which is exactly what you want): (df['COL2'] == 'TRUE')

问题 How to convert true false values in Dataframe as 1 for true and 0 for false COL1 COL2 COL3 COL4 12 TRUE 14 FALSE 13 FALSE 13 TRUE OUTPUT 12 1 14 0 13 0 13 1 回答1: First, if you have the strings 'TRUE' and 'FALSE' , you can convert those to boolean True and False values like this: df['COL2'] == 'TRUE' That gives you a bool column. You can use astype to convert to int (because bool is an integral type, where True means 1 and False means 0 , which is exactly what you want): (df['COL2'] == 'TRUE')

问题 I am wanting to do Boolean operations on STL files with geometric primitives from the VTK library. My problem is converting the STL geometry to something that the VTK Boolean objects will except. I tried the following... import vtk filename = 'gyroid.stl' reader = vtk.vtkSTLReader() reader.SetFileName(filename) mapper = vtk.vtkPolyDataMapper() mapper.SetInputConnection(reader.GetOutputPort()) gyroid = vtk.vtkActor() gyroid.SetMapper(mapper) sphere = vtk.vtkSphere() sphere.SetRadius(30) sphere

问题 In some cases and some code I saw that hashValue is used to convert Bool to Int . However, the code let someValue = true let someOtherValue = false print(someValue.hashValue) print(someOtherValue.hashValue) gets me the output -5519895559129191040 7814522403520016984 I would expect 1 and 0 , though. I use XCode 10.0 beta 2 (10L177m), MacOS High Sierra with Swift 4.2. I can switch to Swift 4.0 to gain likewise results. Now, is there something I do wrong or is hashValue no reliable conversion

问题 In some cases and some code I saw that hashValue is used to convert Bool to Int . However, the code let someValue = true let someOtherValue = false print(someValue.hashValue) print(someOtherValue.hashValue) gets me the output -5519895559129191040 7814522403520016984 I would expect 1 and 0 , though. I use XCode 10.0 beta 2 (10L177m), MacOS High Sierra with Swift 4.2. I can switch to Swift 4.0 to gain likewise results. Now, is there something I do wrong or is hashValue no reliable conversion

问题 This question already has answers here : How does the bitwise complement operator (~ tilde) work? (15 answers) Closed 4 months ago . The problem I found that ~True is -2 & ~False is -1 using my Jupyter Notebook. This source says that ~ invertes all the bits. Why isn't ~True is False and ~False is True ? Reasoning attempts My attempt to explain these: True is +1 , and the bits of +1 are inverted. + is inverted to - . 1 in two-digit binary is 01 , so inverted bits: 10 , ie 2 . So result is -2 .

问题 This question already has answers here : How does the bitwise complement operator (~ tilde) work? (15 answers) Closed 4 months ago . The problem I found that ~True is -2 & ~False is -1 using my Jupyter Notebook. This source says that ~ invertes all the bits. Why isn't ~True is False and ~False is True ? Reasoning attempts My attempt to explain these: True is +1 , and the bits of +1 are inverted. + is inverted to - . 1 in two-digit binary is 01 , so inverted bits: 10 , ie 2 . So result is -2 .