Python Brute Force algorithm
If you REALLY want to brute force it, try this, but it will take you a ridiculous amount of time: On a smaller example, where list = ‘ab’ and we only go up to 5, this prints the following:
Python
“E: Unable to locate package python3-pip”
I am unable to locate package python-pip: How can I resolve this problem?
How can I make one python file run another? [duplicate]
There are more than a few ways. I’ll list them in order of inverted preference (i.e., best first, worst last): Treat it like a module: import file. This is good because it’s secure, fast, and maintainable. Code gets reused as it’s supposed to be done. Most Python libraries run using multiple methods stretched over lots … Read more
How to install NumPy for Python 3.6
I am using Python 3.6b3 for a long running project, developing on Windows. For this project I also need NumPy. I’ve tried Python36 -m pip install numpy, but it seems that pip is not yet in the beta. What’s the best way to install NumPy for Python 3.6b3? [EDIT: Added installation log, after using ensurepip]
What exactly do “u” and “r” string flags do, and what are raw string literals?
There’s not really any “raw string“; there are raw string literals, which are exactly the string literals marked by an ‘r’ before the opening quote. A “raw string literal” is a slightly different syntax for a string literal, in which a backslash, \, is taken as meaning “just a backslash” (except when it comes right … Read more
Getting a name error when trying to input a string [duplicate]
ERROR: If I try to add a name to the database I get a nameerror. NameError: name ‘alan’ is not defined. What’s weird is that strings won’t work but numbers will. Sorry if my question is unclear.
Making a POST call instead of GET using urllib2
This may have been answered before: Python URLLib / URLLib2 POST. Your server is likely performing a 302 redirect from http://myserver/post_service to http://myserver/post_service/. When the 302 redirect is performed, the request changes from POST to GET (see Issue 1401). Try changing url to http://myserver/post_service/.
Beginner Python: AttributeError: ‘list’ object has no attribute
Consider: Output: 33.0 20.0 The difference is that in your bikes dictionary, you’re initializing the values as lists […]. Instead, it looks like the rest of your code wants Bike instances. So create Bike instances: Bike(…). As for your error this will occur when you try to call .cost on a list object. Pretty straightforward, … Read more
Are nested try/except blocks in Python a good programming practice?
Your first example is perfectly fine. Even the official Python documentation recommends this style known as EAFP. Personally, I prefer to avoid nesting when it’s not necessary: PS. has_key() has been deprecated for a long time in Python 2. Use item in self.dict instead.
OpenCV houghLinesP parameters
Ok, I finally found the problem and thought I would share the solution for anyone else driven nuts by this. The issue is that in the HoughLinesP function, there is an extra parameter, “lines” which is redundant because the output of the function is the same: cv2.HoughLinesP(image, rho, theta, threshold[, lines[, minLineLength[, maxLineGap]]]) This is … Read more