Nameerror: name by is not defined

Nameerror: name by is not defined

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Are you having a hard time dealing with the Python nameerror: name by is not defined error message?

In this article, we’ll show you how you can fix this error.

Continue reading to fully understand what this error means and why it occurs in your Python script.

What is NameError?

A NameError occurs if you try to use a variable or a function name that is not valid.

A name can be either related to a built-in function or to something you define in your program (e.g. a variable or a function).

What is “nameerror name by is not defined”?

The nameerror: name ‘by’ is not defined is an error message that usually occurs when a Python interpreter encountered a variable named “by” in your code, but could not find a definition for it.

In simple words, this error message occurs when Python encounters a variable or function that has not been defined.

It indicates that Python does not recognize the name of the variable or function that you are trying to use.

Why does this error occur?

This nameerror name by is not defined error message can occur for a variety of reasons, such as:

❌ Misspelled variable or function names

❌Undefined variables or functions, scope issues, or import errors.

How to “nameerror: name by is not defined”?

To fix this error, you have to check your code to ensure that the variable “by” is defined before it is used and that it is spelled correctly.

Add import statement

If you are encountering this error message while you using Python Selenium WebDriver.

You need to add this line at the top of your Python script:

✅ from selenium.webdriver.common.by import By

Define the Variable or Function

One common reason for this error is that the variable or function you are trying to use has not been defined.

To fix this, you have to define the variable or function before you use it in your code.

Incorrect code:

❌ by = 10
print(b)

Corrected code:

✅ by = 100
print(by)

or 

✅ def by():
    return 100

print(by())

Output:

100

Conclusion

The nameerror: name ‘by’ is not defined is an error message that usually occurs when the Python interpreter encountered a variable named “by” in your code, but could not find a definition for it.

This article already provides solutions for this error to help you fix the error message.

You could also check out other “nameerror” articles that may help you in the future if you encounter them.

Hoping that this article helps you fix the error. Thank you for reading itsourcecoders 😊