what does the __file__ variable mean/do?

I usually just hard-wire these with the actual path. But there is a reason for these statements that determine path at runtime, and I would really like to understand the os.path module so that I can start using it.

Python Key Error=0 – Can’t find Dict error in code

The error you’re getting is that self.adj doesn’t already have a key 0. You’re trying to append to a list that doesn’t exist yet. Consider using a defaultdict instead, replacing this line (in __init__): with this: You’ll need to import at the top: Now rather than raise a KeyError, self.adj[0].append(edge) will create a list automatically to append to.

What is the difference between a strongly typed language and a statically typed language?

What is the difference between a strongly typed language and a statically typed language? A statically typed language has a type system that is checked at compile time by the implementation (a compiler or interpreter). The type check rejects some programs, and programs that pass the check usually come with some guarantees; for example, the … Read more

What does enctype=’multipart/form-data’ mean?

When you make a POST request, you have to encode the data that forms the body of the request in some way. HTML forms provide three methods of encoding. application/x-www-form-urlencoded (the default) multipart/form-data text/plain Work was being done on adding application/json, but that has been abandoned. (Other encodings are possible with HTTP requests generated using other means … Read more