python-2.7

问题 I'm getting this error when I'm trying to install "pyautogui" library to python. Please find the details below - ERROR: Complete output from command python setup.py egg_info: ERROR: Traceback (most recent call last): File "<string>", line 1, in <module> File "################\pip-install-pmckiy\pygetwindow\setup.py", line 10, in <module> with open('README.md', 'r', encoding='utf-8') as fh: TypeError: 'encoding' is an invalid keyword argument for this function ---------------------------------

问题 The dot product of two vectors can be computed via numpy.dot. Now I want to compute the dot product of an array of vectors: >>> numpy.arange(15).reshape((5, 3)) array([[ 0, 1, 2], [ 3, 4, 5], [ 6, 7, 8], [ 9, 10, 11], [12, 13, 14]]) The vectors are row vectors and the output should be a 1d-array containing the results from the dot products: array([ 5, 50, 149, 302, 509]) For the cross product (numpy.cross) this can be easily achieved specifying the axis keyword. However numpy.dot doesn't have

问题 I load a picture on the Canvas. It is a large picture so I need to scroll vertically and horizontally to be able to see it. I also let the user to drawn random curves/lines using the mouse pointer on the image. Everything is ok except that when I scroll horizontally or vertically then I try to draw I see the curves are not drawn where the mouse points to but in an other place. How can I resolve this problem ? Here is my code: import PIL.Image import PIL.ImageTk from Tkinter import * import

问题 I am just experimenting and having fun with Python 2.7 and I'm trying to write a quadratic equation solver. I had it working when the radicand is positive, but when it's negative im getting an error. even after this if else statement. it also doesnt work with big numbers. thanks for the help. import math a = raw_input("a = ") b = raw_input("b = ") c = raw_input("c = ") float(a) float(b) float(c) radicand = ((b**2)-4*a*c) if radicand >= 0: print(((0-b) + math.sqrt((b**2)-4*a*c))/(2*a)) print((

问题 I am currently in the course of learning Python 2.7 and have come across the Equality and Boolean operators My question is: Why False and 1 is False but True and 1 is 1 Likewise, False or 1 is 1 but True or 1 is True Can someone kindly explain why this is happening Many thanks 回答1: and returns the first 'falsy' (False, zero, empty string or list, etc.) value it sees, or the final value if none were falsy. Further values are not even evaluated, since they can't change the result. or likewise

问题 INCLUDEPATH = -L /usr/include/python2.7 LIBS += /usr/local/lib/python2.7 QMAKE_CXXFLAGS += /usr/local/lib/python2.7 error: cannot find /usr/local/lib/python2.7: File format not recognized There is a problem. I have already installed python-all-dev. 回答1: You must use the following format: LIBS += -L {path of your library.so} -l{library} INCLUDEPATH += {path of your headers} DEPENDPATH += {path of your headers} In your case: LIBS += -L /usr/local/lib/python2.7 -lpython2.7 INCLUDEPATH += /usr

问题 I would like to call an object method dynamically. The variable "MethodWanted" contains the method I want to execute, the variable "ObjectToApply" contains the object. My code so far is: MethodWanted=".children()" print eval(str(ObjectToApply)+MethodWanted) But I get the following error: exception executing script File "<string>", line 1 <pos 164243664 childIndex: 6 lvl: 5>.children() ^ SyntaxError: invalid syntax I also tried without str() wrapping the object, but then I get a "cant use +

问题 I would like to call an object method dynamically. The variable "MethodWanted" contains the method I want to execute, the variable "ObjectToApply" contains the object. My code so far is: MethodWanted=".children()" print eval(str(ObjectToApply)+MethodWanted) But I get the following error: exception executing script File "<string>", line 1 <pos 164243664 childIndex: 6 lvl: 5>.children() ^ SyntaxError: invalid syntax I also tried without str() wrapping the object, but then I get a "cant use +

问题 I would like to call an object method dynamically. The variable "MethodWanted" contains the method I want to execute, the variable "ObjectToApply" contains the object. My code so far is: MethodWanted=".children()" print eval(str(ObjectToApply)+MethodWanted) But I get the following error: exception executing script File "<string>", line 1 <pos 164243664 childIndex: 6 lvl: 5>.children() ^ SyntaxError: invalid syntax I also tried without str() wrapping the object, but then I get a "cant use +

问题 I installed openCV and numpy libraries in python 2.7. I've tested them using commands import cv2 and import numpy and it compiled. But when I use the cv2.imshow('frame', ----) function it displays a window but not displaying the image. And it's showing " frame is Not Responding". So, I tried with matplotlib functions for displaying image and it worked. I inserted cv2.imshow function in the 2nd case and it worked. Versions [Python-2.7.10, OpenCV-2.4.11] Below is the code, Case 1: Not Working