For empty strings both are different: will not print anything because it is empty and therefore considered False but: will print because foo is not None! I Changed it according to PEP8. if foo is not None is equivalent to your if not foo is None but more readable and therefore recommended by PEP8. A bit more about the general principles in Python: The if will only be True if a … Read more
You could try the search feature in pip, which looks for packages in PyPI with yaml in the short description. That reveals various packages, including PyYaml, yamltools, and PySyck, among others (Note that PySyck docs recommend using PyYaml, since syck is out of date). Now you know a specific package name, you can install it: If you … Read more
You can create a path relative to a module by using a module’s __file__ attribute. For example: This should do what you want regardless of where you start your script.
when i setup application.py, it shows that socket.error: [Errno 98] Address already in use.
In Python 3 it makes a difference whether you open the file in binary or text mode. Just add the b flag to make it binary: This works in Python 2 too.
Below is the code that worked for me: Looking back at the code I had amended, the directory was getting confused with the directory of the script. The following also works while not ruining the working directory. First remove the line Then assign file_name as
Looks like you forgot the mode parameter when calling open, try w: The default value is r and will fail if the file does not exist Other interesting options are See Doc for Python2.7 or Python3.6 — EDIT — As stated by chepner in the comment below, it is better practice to do it with a withstatement (it guarantees that the file will be closed)
Possible Duplicate:Get difference from two lists in Python What is a simplified way of doing this? I have been trying on my own, and I can’t figure it out. list a and list b, the new list should have items that are only in list a. So: I tried writing code, but every time it … Read more
The name scrambling is used to ensure that subclasses don’t accidentally override the private methods and attributes of their superclasses. It’s not designed to prevent deliberate access from outside. For example: Of course, it breaks down if two different classes have the same name.
[:] is the array slice syntax for every element in the array. This answer here goes more in depth of the general uses: Explain Python’s slice notation