python
Convert JSON string to dict using Python
I’m a little bit confused with JSON in Python.
To me, it seems like a dictionary, and for that reason
I’m trying to do that:
pandas: multiple conditions while indexing data frame – unexpected behavior
I am filtering rows in a dataframe by values in two columns.
mkdir -p functionality in Python
If parents is true, any missing parents of this path are created as
needed; they are created with the default permissions without taking
mode into account (mimicking the POSIX mkdir -p command).
If exist_ok is false (the default), an FileExistsError is raised if
the target directory already exists.
Replace non-ASCII characters with a single space
I need to replace all non-ASCII (x00-x7F) characters with a space. I’m surprised that this is not dead-easy in Python, unless I’m missing something. The following function simply removes all non-ASCII characters:
What is the difference between NaN and None?
I am reading two columns of a csv file using pandas readcsv() and then assigning the values to a dictionary. The columns contain strings of numbers and letters. Occasionally there are cases where a cell is empty. In my opinion, the value read to that dictionary entry should be None but instead nan is assigned. Surely None is more descriptive of an empty cell as it has a null value, whereas nan just says that the value read is not a number.
How do I get list of methods in a Python class?
I want to iterate through the methods in a class, or handle class or instance objects differently based on the methods present. How do I get a list of class methods?
What is the purpose of the -m switch?
Could you explain to me what the difference is between calling
ImportError: DLL load failed: The specified module could not be found
I have installed Python 2.5.4, Numpy 1.5.0 win32, Matplotlib 1.0.0 win32, pywin32 218. Still not able to plot graphs in Python. Here is the error I am getting :
How do I correctly clean up a Python object?
class Package: def __init__(self): self.files = [] # … def __del__(self): for file in self.files: os.unlink(file) __del__(self) above fails with an AttributeError exception. I understand Python doesn’t guarantee the existence of “global variables” (member data in this context?) when __del__() is invoked. If that is the case and this is the reason for the exception, … Read more