Adding +1 to a variable inside a function
You could also pass points to the function: Small example:
python
What is an easy way to implement fprintf in python?
In python, the following will let us write to stdout: However, I want to be flexible about which stream we print to. I want to pass the stream as an argument into a function, as you would when calling fprintf in any of C derived languages. In the snippet of source code above, stdout is … Read more
How to handle a Button click event
I’m just learning Python and I have the base concept down, and already a few command line programs. I’m now learning how to create GUIs with Tkinter. I created a simple GUI to accept some user information from a Entry widget, and then, when the user clicks submit, it should pop up a dialog. The … Read more
How do I read image data from a URL in Python?
The following works for Python 3: References: https://github.com/python-pillow/Pillow/pull/1151 https://github.com/python-pillow/Pillow/blob/master/CHANGES.rst#280-2015-04-01
Pandas unstack problems: ValueError: Index contains duplicate entries, cannot reshape
Here’s an example DataFrame which show this, it has duplicate values with the same index. The question is, do you want to aggregate these or keep them as multiple rows? One solution is to reset_index (and get back to df) and use pivot_table. Another option (if you don’t want to aggregate) is to append a … Read more
What is the difference between an expression and a statement in Python?
Expressions only contain identifiers, literals and operators, where operators include arithmetic and boolean operators, the function call operator () the subscription operator [] and similar, and can be reduced to some kind of “value”, which can be any Python object. Examples: yield 7 Statements (see 1, 2), on the other hand, are everything that can … Read more
Porting Perl to Python
Keep a phrasebook handy as you go through the code you want to port.
How can I find script’s directory?
You need to call os.path.realpath on __file__, so that when __file__ is a filename without the path you still get the dir path:
How to split elements of a list?
Something like:
What is the meaning of “int(a[::-1])” in Python?
Assuming a is a string. The Slice notation in python has the syntax – So, when you do a[::-1], it starts from the end towards the first taking each element. So it reverses a. This is applicable for lists/tuples as well. Example – Then you convert it to int and then back to string (Though … Read more