Python error: default variable is not initialized when importing the module

Question

Python error: default variable is not initialized when importing the module

Imagine I have a module called foo.py that includes the following function:

def bar(var=somedict):
    print(var)

In my main program, main.py, I import this module, declare the variable somedict and then execute the function bar:

from foo import *
somedict = 'foobar'
bar()

The goal is to have somedict passed as a default parameter without explicitly specifying it (something I want to avoid for the actual program I am working on).

However, Python raises a

NameError: name 'somedict' is not defined

. How can I still import the module and achieve the desired 'passing along of the default variable'? Thank you!

python import module

Answer 1

Answer №1

The variable "somedict" is not defined when importing. Therefore, using <code>from foo import *

will result in the error message

NameError: name 'somedict' is not defined

To resolve this issue, make the following changes to foo.py

somedict={}
def bar(var=None):
    if var is None:
        var=somedict
    print(var)

After making these modifications, you should be able to achieve what you were attempting to do, but in a slightly different manner

import foo
foo.somedict = {'a':1}
foo.bar()

Answer 2

The variable "somedict" is not defined when importing. Therefore, using <code>from foo import *

will result in the error message

NameError: name 'somedict' is not defined

To resolve this issue, make the following changes to foo.py

somedict={}
def bar(var=None):
    if var is None:
        var=somedict
    print(var)

After making these modifications, you should be able to achieve what you were attempting to do, but in a slightly different manner

import foo
foo.somedict = {'a':1}
foo.bar()

Python error: default variable is not initialized when importing the module

Answer №1

Similar questions

The dictionary's get method is failing to properly retrieve the requested data

A foolproof method for recording Python code efficiently

The action of clicking on the dropdown menu does not yield any results

Acquire the website link using Selenium in the Python programming language

The email confirmation feature in Flask-Security using Flask-Mail fails to send unless changes are made to the flask_security/utils.py file

Not adhering to PyTorch's LRScheduler API - Transform function into lambda expression for lr_lambda

Python's IndexError occurs when attempting to access an index that does not exist within a list

shell_plus is experiencing issues with autoload, not loading all of the necessary apps

Here are the steps to resolve the error message: "selenium.common.exceptions.NoSuchElementException: Message: no such element: Unable to locate element"

Risks associated with storing configuration files in JSON/CPickle are related to security

Exploring JSON using Python for retrieving selective outcomes

Is it possible to extract data from tables that have the 'ngcontent' structure using Selenium with Python?

Set up scripts to run at regular time intervals without interruption

Python OSError: [Errno 9] Issue with file descriptor encountered upon attempting to open large JSON file

Executing numerous test scenarios using a single instance of the Selenium web driver

Encountering difficulty transforming DataFrame into an HTML table

GAE/P: Streamlining the transition to NDB

Rearrange the positions of the latitude and longitude values in a JSON file without any additional tags

Creating unique message formats for communication between a python client and a socket.io node.js server

Converting JSON to CSV Using Python