python-2.7

问题 I need to convert a binary input into a decimal integer. I know how to go from a decimal to a binary: n = int(raw_input('enter a number: ')) print '{0:b}'.format(n) I need to go in the reverse direction. My professor said that when he checks our code, he is going to input 11001 , and he should get 25 back. I've looked through our notes, and I cannot figure out how to do this. Google and other internet resources haven't been much help either. The biggest problem is that we are not allowed to

问题 I need to convert a binary input into a decimal integer. I know how to go from a decimal to a binary: n = int(raw_input('enter a number: ')) print '{0:b}'.format(n) I need to go in the reverse direction. My professor said that when he checks our code, he is going to input 11001 , and he should get 25 back. I've looked through our notes, and I cannot figure out how to do this. Google and other internet resources haven't been much help either. The biggest problem is that we are not allowed to

问题 I just installed the desktop version of pg4admin after having difficulty running it using my prior install. I used the following installing documentation to pull this off. However, when I run the pgadmin4 service, the page gives my the following error: Unauthorized The server could not verify that you are authorized to access the URL requested. You either supplied the wrong credentials (e.g. a bad password), or your browser doesn't understand how to supply the credentials required. Also, on

问题 I have a program that is an endless loop that prints "program running" every 5 seconds and I want to stop it when I press the end key. So I created a key listener that returns false if the end key is pressed. That should work if I won't have the endless loop. And I want it to work even when I'm in the endless loop. Here's my code: from pynput import keyboard import time def on_press(key): print key if key == keyboard.Key.end: print 'end pressed' return False with keyboard.Listener(on_press=on

问题 I have a program that is an endless loop that prints "program running" every 5 seconds and I want to stop it when I press the end key. So I created a key listener that returns false if the end key is pressed. That should work if I won't have the endless loop. And I want it to work even when I'm in the endless loop. Here's my code: from pynput import keyboard import time def on_press(key): print key if key == keyboard.Key.end: print 'end pressed' return False with keyboard.Listener(on_press=on

问题 I feel that extracting data from html tables is extremely difficult and requires custom build for each site.. I would very much like to be proved wrong here.. Is there an simple pythonic way to extract strings and numbers out of a website by just using the url and xpath of the table of interest? Example: url_str = 'http://www.fdmbenzinpriser.dk/searchprices/5/' xpath_str = //*[@id="sortabletable"] I once had a script that could fetch data from this site. But lost it. As I recall it I was

问题 I am trying to get all replies of this particular user. So this particular user have reply_to_user_id_str of 151791801. I tried to print out all the replies but I'm not sure how. However, I only manage to print out only 1 of the replies. Can anyone help me how to print out all the replies? My codes are: for page in tweepy.Cursor(api.user_timeline, id="253346744").pages(1): for item in page: if item.in_reply_to_user_id_str == "151791801": print item.text a = api.get_status(item.in_reply_to

问题 What is the correct type annotation for a __init__ function in python? class MyClass: ... Which of the following would make more sense? def __init__(self): # type: (None) -> None def __init__(self): # type: (MyClass) -> MyClass def __init__(self): # type: (None) -> MyClass Since we would normally instantiate as myclass = MyClass() , but the __init__ function itself has no return value. 回答1: self should be omitted from the annotation when it is given as a comment, and __init__() should be

问题 What is the correct type annotation for a __init__ function in python? class MyClass: ... Which of the following would make more sense? def __init__(self): # type: (None) -> None def __init__(self): # type: (MyClass) -> MyClass def __init__(self): # type: (None) -> MyClass Since we would normally instantiate as myclass = MyClass() , but the __init__ function itself has no return value. 回答1: self should be omitted from the annotation when it is given as a comment, and __init__() should be

问题 This question already has answers here : Why is Button parameter “command” executed when declared? (5 answers) Closed 2 years ago . I have created a frame, In that i have two browse button, i want browse two file that ending with ".txt" extension and printing it on screen. In my scenario, browse function getting called before pressing Button's on the frame. Am expecting it should called when i press Button. Complete code attached. Kindly someone correct me what i did wrong. from Tkinter