Is there a way in Python to list all installed packages and their versions? I know I can go inside python/Lib/site-packages and see what files and directories exist, but I find this very awkward. ...

3 If the Python version you installed is 3.6.1, you can print strings and a variable through a single line of code. For example the first string is "I have", the second string is "US Dollars" and the variable …

I have this folder structure: application ├── app │ └── folder │ └── file.py └── app2 └── some_folder └── some_file.py How can I import a function from file.py, from within som...

How do I determine: the current directory (where I was in the shell when I ran the Python script), and where the Python file I am executing is?

How do I read every line of a file in Python and store each line as an element in a list? I want to read the file line by line and append each line to the end of the list.

How do I convert the following for-loop containing an if/else into a list comprehension? results = [] for x in xs: results.append(f(x) if x is not None else '') It should yield '' if x is None...

How do I write JSON data stored in the dictionary data to a file? f = open ('data.json', 'wb') f.write (data) This gives the error: TypeError: must be string or buffer, not dict

How do I check whether a file exists or not, without using the try statement?

Evaluate an expression node or a string containing only a Python literal or container display. The string or node provided may only consist of the following Python literal structures: strings, bytes, numbers, …

if not a: # do this! print('a is an empty list') PEP 8 PEP 8, the official Python style guide for Python code in Python's standard library, asserts: For sequences, (strings, lists, tuples), use the fact that empty …