matplotlib: how to draw a rectangle on image
You can add a Rectangle patch to the matplotlib Axes. For example (using the image from the tutorial here):
Python
Pandas error “Can only use .str accessor with string values”
It’s happening because your last column is empty so this becomes converted to NaN: If you slice your range up to the last row then it works: Alternatively you can just select the cols that are object dtype and run the code (skipping the first col as this is the ‘Name’ entry):
Appending to a list gives ‘int’ object has no attribute ‘append’
Traceback (most recent call last): File “/home/shinigami/prac5.py”, line 21, in a[i].append(p) AttributeError: ‘int’ object has no attribute ‘append’ Your variable a is a list of integers. When you write a[i].append(…) you’re trying to call an append method on an int type, which causes the error. Writing a.append(…) is fine because a is a list, but as soon as you index into the list, you’re dealing with with the numbers within the list, and they … Read more
Python: How to check if keys exists and retrieve value from Dictionary in descending priority
One option if the number of keys is small is to use chained gets: But if you have keySet defined, this might be clearer: The chained gets do not short-circuit, so all keys will be checked but only one used. If you have enough possible keys that that matters, use the for loop.
Flask Error: “Method Not Allowed The method is not allowed for the requested URL”
What is happening here is that database route does not accept any url methods. I would try putting the url methods in the app route just like you have in the entry_page function:
Sorting and Grouping Nested Lists in Python
For the first question, the first thing you should do is sort the list by the second field using itemgetter from the operator module: Then you can use itertools’ groupby function: Now y is an iterator containing tuples of (element, item iterator). It’s more confusing to explain these tuples than it is to show code: Which prints: For the … Read more
Substitution Cipher Python
Original answer below: Please show us some sample input and output for an example. Based on your code, I can come up with the following – random.shuffle shuffles everything in place and returns None, change your makeKey to: EDIT 2: For an approach without using dicts in encryption/decryption, see below: Prints: EDIT: After some spacing issues and experimentation, I … Read more
How to run Pip commands from CMD
Little side note for anyone new to Python who didn’t figure it out by theirself: this should be automatic when installing Python, but just in case, note that to run Python using the python command in Windows’ CMD you must first add it to the PATH environment variable, as explained here. To execute Pip, first of all make sure you have it … Read more
Easy pretty printing of floats?
It’s an old question but I’d add something potentially useful: I know you wrote your example in raw Python lists, but if you decide to use numpy arrays instead (which would be perfectly legit in your example, because you seem to be dealing with arrays of numbers), there is (almost exactly) this command you said you made … Read more
“SyntaxError: non-keyword arg after keyword arg” Error in Python when using requests.post()
Try: response = requests.post(“http://api.bf3stats.com/pc/player/”, opt, data=player) You cannot put a non-keyword argument after a keyword argument. Take a look at the docs at http://docs.python.org/2.7/tutorial/controlflow.html?highlight=keyword%20args#keyword-arguments for more info.