ValueError: cannot switch from manual field specification to automatic field numbering
that doesn’t work. If you specify positions, you have to do it through the end: In your case, best is to leave python treat that automatically:
python-3.x
“This constructor takes no arguments” error in __init__
The method should be named __init__ to be a constructor, not _init_. (Note the double underscores.) If you use single underscores, you merely create a method named _init_, and get a default constructor, which takes no arguments.
pip throws TypeError: parse() got an unexpected keyword argument ‘transport_encoding’ when trying to install new packages
I am using the latest version of Anaconda3. I just installed it and I am trying to download some packages. I am using the Anaconda Prompt. While trying to use pip to do anything (including upgrading existing packages) I get the following traceback. Any ideas? (this problem only started after I installed tensorflow) Thanks.
built-in range or numpy.arange: which is more efficient?
For large arrays, a vectorised numpy operation is the fastest. If you must loop, prefer xrange/range and avoid using np.arange. In numpy you should use combinations of vectorized calculations, ufuncs and indexing to solve your problems as it runs at C speed. Looping over numpy arrays is inefficient compared to this. (Something like the worst … Read more
matplotlib: plot multiple columns of pandas data frame on the bar chart
You can plot several columns at once by supplying a list of column names to the plot‘s y argument. This will produce a graph where bars are sitting next to each other. In order to have them overlapping, you would need to call plot several times, and supplying the axes to plot to as an … Read more
Checking to see if a string is an integer or float
If the string is convertable to integer, it should be digits only. It should be noted that this approach, as @cwallenpoole said, does NOT work with negative inputs beacuse of the ‘-‘ character. You could do: If you already have Number confirmed as a float, you can always use is_integer (works with negatives):
Decode Hex String in Python 3
Something like: Just put the actual encoding you are using.
Python: urllib.error.HTTPError: HTTP Error 404: Not Found
So apparently the default display number of questions per page is 50 so the range you defined in the loop goes out of the available number of pages with 50 questions per page. The range should be adapted to be within the number of total pages with 50 questions each. This code will catch the … Read more
python 3.x ImportError: No module named ‘cStringIO’
From Python 3.0 changelog: The StringIO and cStringIO modules are gone. Instead, import the io module and use io.StringIO or io.BytesIO for text and data respectively. From the Python 3 email documentation it can be seen that io.StringIO should be used instead:
Python 3.5.1 urllib has no attribute request
According to this, you have to use the following: The reason is: With packages, like this, you sometimes need to explicitly import the piece you want. That way, the urllib module doesn’t have to load everything up just because you wanted one small part.