python-2.7

问题 I have a Python (2.7) console application that I have written on Windows (8.1). I have used argparse.ArgumentParser() for handling the parameters when executing the program. The application has quite a few parameters, so when the --help parameter is used the documentation greatly exceeds the size of the console window. Even with the console window maximized. Which is fine, but the issue I'm encountering is that the user is unable to scroll up to view the rest of the help documentation. I have

问题 I have a Python (2.7) console application that I have written on Windows (8.1). I have used argparse.ArgumentParser() for handling the parameters when executing the program. The application has quite a few parameters, so when the --help parameter is used the documentation greatly exceeds the size of the console window. Even with the console window maximized. Which is fine, but the issue I'm encountering is that the user is unable to scroll up to view the rest of the help documentation. I have

问题 I want a faster Normalized cross correlation using which i can compute similarity between two images. I want to know whether there is any built in functions which can find correlation between two images other than scipy.signal.correlate2d() and matplotlib xcorr() . If these two functions are working can anyone show me an example to find correlation between two images. path1='D:/image/cat1.jpg' path2='D:/image/cat2.jpg' corrCoefft = computeCorrelationCoefft(path1,path2) 回答1: OpenCV does

问题 I've only found one other question asking exactly this with no answer, so I'm asking here. I am running Ubuntu 18.04, VSCode latest version. I have installed OpenCV 3.4.9 from source to /usr/local When I import cv2 and then try to type "cv2.", VSCode is unable to autocomplete. The only suggestions it makes are "bootstrap" and "os". I have no problem with autocomplete with any other module like numpy or rospy, or even when OpenCV is installed from pip. It seems the issue is only when OpenCV is

问题 I'm trying to create a julian date in python and having major struggles. Is there nothing out there as simple as: jul = juliandate(year,month,day,hour,minute,second) where jul would be something like 2457152.0 (the decimal changing with the time)? I've tried jdcal, but can't figure out how to add the time component (jdcal.gcal2jd() only accepts year, month and day). 回答1: Not a pure Python solution but you can use the SQLite in memory db which has a julianday() function: import sqlite3 con =

问题 Good day all, I am trying to convert a list of length-2 items to a dictionary using the below: my_list = ["b4", "c3", "c5"] my_dict = {key: value for (key, value) in my_list} The issue is that when a key occurrence is more than one in the list, only the last key and its value are kept. So in this case instead of my_dict = {'c': '3', 'c': '5', 'b': '4'} I get my_dict = {'c': '5', 'b': '4'} How can I keep all key:value pairs even if there are duplicate keys. Thanks 回答1: For one key in a

问题 Good day all, I am trying to convert a list of length-2 items to a dictionary using the below: my_list = ["b4", "c3", "c5"] my_dict = {key: value for (key, value) in my_list} The issue is that when a key occurrence is more than one in the list, only the last key and its value are kept. So in this case instead of my_dict = {'c': '3', 'c': '5', 'b': '4'} I get my_dict = {'c': '5', 'b': '4'} How can I keep all key:value pairs even if there are duplicate keys. Thanks 回答1: For one key in a

问题 I am running below code to remove duplicates from Linked List. But my code only prints linked List before removing duplicates. Once removeDup method is called, it does not print anything. Below is my code. Please tell me what am I missing. class Node: def __init__(self, data): self.data = data self.next = None class LinkedList: def __init__(self): self.head = None def insert(self, data): node = Node(data) node.next=self.head self.head = node def printl(self): current = self.head while current

问题 I set my cronjob to call my script at particular time( ex- 2 4 5 10 * python3 mayank/exp/test.py ). When my test.py is called I'm activating the virtualenv within my test.py script as follows. activate = "/home/myserver/schedule_py3/bin/activate_this.py" exec(open(activate).read()) After activating the virtual environment(which has python3 in it and the packages needed to run the script), I'm trying to import requests it is showing me error as:- File "schedule_module/Schedule/notification

问题 New to Python, trying to understand how this iterative loop that is intended to remove all items form the list is handling the indexes in the list and why it stops where it does... Why does this loop: foo = ['a', 'b', 'c', 'd', 'e', 'f', 'g', 'h'] for i in foo: foo.remove(i) print foo Stop here? ['b', 'd', 'f', 'h'] Instead of here? ['H'] Also, what's happening "under the hood" with the indexes here? With every iteration, is Python keeping track of which index is next while at the same time,