Python has resolved NameError: name ‘xxx’ is not defined

In Python programming,NameErroris a very common error type that happens when you try to access an undefined variable. This article will explain the cause of this error and how to solve this problem with specific code examples.

Cause of error

NameErrorUsually caused by the following situations:

Error spelling: The variable name is misspelled, causing Python to be unrecognized.
Scope issues: Attempt to access variables that are not defined in the current scope.
Variable not initialized: Try using the variable before it is assigned.
Import error: Try to use a module or function that is not imported correctly.

Error Example

Here are some common onesNameErrorExample:

Error spelling

varible = 10  # The correct one should be variableprint(variabl)  # NameError: name 'variabl' is not defined

Scope issues

def my_function():
    print(x)  # NameError: name 'x' is not defined

my_function()

Variable not initialized

print(y)  # NameError: name 'y' is not defined

Import error

import math

result = (16)  # NameError: name 'Math' is not defined

Solution

Method 1: Check the spelling

Make sure all variable names are spelled correctly.

variable = 10
print(variable)

Method 2: Ensure that the variable is defined in the current scope

If the variable is defined inside the function, make sure you have defined it before using it.

def my_function():
    x = 5
    print(x)

my_function()

Method 3: Initialize variables

Before using the variable, make sure it has been assigned.

y = 0
print(y)

Method 4: Correctly import modules

Make sure you have correctly imported the modules or functions you need to use.

import math

result = (16)  # Use the correct module nameprint(result)

Method 5: Use local variables

If you need to use variables inside the function, make sure to define it inside the function.

def my_function():
    local_var = "I am defined inside the function"
    print(local_var)

my_function()

in conclusion

NameErrorAlthough common, it is usually easy to solve. The key is to double-check your code to make sure that the variables are correctly defined and assigned before use. By following the above method, you can effectively avoid and resolveNameErrorquestion.

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