Python - Read For Learn

Declaring a multi dimensional dictionary in python

A multi-dimensional dictionary is simply a dictionary where the values are themselves also dictionaries, creating a nested structure: You’d have to detect that you already created new_dic[1] each time, though, to not accidentally wipe that nested object for additional keys under new_dic[1]. You can simplify creating nested dictionaries using various techniques; using dict.setdefault() for example: dict.setdefault() will only set a key … Read more

Checking to see if a string is an integer or float

If the string is convertable to integer, it should be digits only. It should be noted that this approach, as @cwallenpoole said, does NOT work with negative inputs beacuse of the ‘-‘ character. You could do: If you already have Number confirmed as a float, you can always use is_integer (works with negatives):

How to load all modules in a folder?

List all python (.py) files in the current folder and put them as __all__ variable in __init__.py

Numpy – add row to array

What is X? If it is a 2D-array, how can you then compare its row to a number: i < 3? EDIT after OP’s comment: add to A all rows from X where the first element < 3:

What is the difference between str and repr?

Alex summarized well but, surprisingly, was too succinct. First, let me reiterate the main points in Alex’s post: The default implementation is useless (it’s hard to think of one which wouldn’t be, but yeah) __repr__ goal is to be unambiguous __str__ goal is to be readable Container’s __str__ uses contained objects’ __repr__ Default implementation is useless This is mostly a surprise because … Read more

Unable to resolve ‘requests’. IntelliSense may be missing for this module. Visual Studio/Python

1.Maybe it’s something similar to this issue. Deleting the init.py in top-level of your project can help resolve this issue. 2.If the above not helps, please try reloading the project. After my test, sometimes in a python application, after the first time we install a python package, the intellisense for the new package in current project won’t work until we reload the project … Read more

Accessing a class’ member variables in Python?

The answer, in a few words In your example, itsProblem is a local variable. Your must use self to set and get instance variables. You can set it in the __init__ method. Then your code would be: But if you want a true class variable, then use the class name directly: But be careful with this one, as theExample.itsProblem is automatically set to … Read more

How to prettyprint a JSON file?

The json module already implements some basic pretty printing in the dump and dumps functions, with the indent parameter that specifies how many spaces to indent by: To parse a file, use json.load():

python pandas remove duplicate columns

Here’s a one line solution to remove columns based on duplicate column names: How it works: Suppose the columns of the data frame are [‘alpha’,’beta’,’alpha’] df.columns.duplicated() returns a boolean array: a True or False for each column. If it is False then the column name is unique up to that point, if it is True then the column name is duplicated earlier. For example, using the … Read more

Python ImportError: No module named wx

Ubuntu:

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