Python and PYAML – yaml.scanner.ScannerError: mapping values are not allowed here
Try putting spaces after the colons.
python
Count Vowels in String Python
I’m trying to count how many occurrences there are of specific characters in a string, but the output is wrong. Here is my code: If I enter the letter A the output would be: 1 1 1 1 1
Convert from ASCII string encoded in Hex to plain ASCII?
A slightly simpler solution:
Python Login Script; Usernames and Passwords in a separate file
You could start having a dictionary of usernames and passwords: Then you have two easy tests: will tell you if the username is in the credentials file (ie. if it’s a key in the credentials dictionary) And then:
Python TypeError: ‘set’ object is not subscriptable
As per the Python’s Official Documentation, set data structure is referred as Unordered Collections of Unique Elements and that doesn’t support operations like indexing or slicing etc. Like other collections, sets support x in set, len(set), and for x in set. Being an unordered collection, sets do not record element position or order of insertion. … Read more
How to convert an integer to a string in any base?
If you need compatibility with ancient versions of Python, you can either use gmpy (which does include a fast, completely general int-to-string conversion function, and can be built for such ancient versions – you may need to try older releases since the recent ones have not been tested for venerable Python and GMP releases, only … Read more
coercing to Unicode: need string or buffer, NoneType found when rendering in django admin
his error happens when you have a __unicode__ method that is a returning a field that is not entered. Any blank field is None and Python cannot convert None, so you get the error. In your case, the problem most likely is with the PCE model’s __unicode__ method, specifically the field its returning. You can … Read more
Python, tuple indices must be integers, not tuple?
Your output variable is not a N x 4 matrix, at least not in python types sense. It is a tuple, which can only be indexed by a single number, and you try to index by tuple (2 numbers with coma in between), which works only for numpy matrices. Print your output, figure out if … Read more
cmake error ‘the source does not appear to contain CMakeLists.txt’
You should do mkdir build and cd build while inside opencv folder, not the opencv-contrib folder. The CMakeLists.txt is there.
What is a clean, Pythonic way to have multiple constructors in Python?
Actually None is much better for “magic” values: Now if you want complete freedom of adding more parameters: To better explain the concept of *args and **kwargs (you can actually change these names): http://docs.python.org/reference/expressions.html#calls