In Python2, the “**raw_input**” function is used to accept the input from the user. The “**raw_input()**” function has been renamed to the “**input()**” in Python 3. So, when the “**raw_input()**” function is called in Python3, the “**NameError**” arises in a program.

This Python write-up will provide a comprehensive guide on why and solutions for the error “name raw_input is not defined” in Python.

**Reason: Using raw_input() Function in Python3****Solution: Use the input() Function****Example: Taking Input From User to Perform Mathematical Computation**

**Reason: Using raw_input() Function in Python3**

The prominent reason which causes this error is when the user practices the “**raw_input**” function in Python**3** rather than the “**input()**” function. In Python**3**, the old “**raw_input()**” function has been renamed to the “**input()**” function.

The above output shows “**NameError**” when the “**raw_input()**” function is used in Python**3**.

**Solution: Use the input() Function**

To solve this error, use the “**input()**” function to accept the input value from the user. An example of this solution using the “**input()**” function is as follows:

**Code:**

```
Value = input('What is Your Name: ')
print(Value)
```

In the above code, the “**input()**” function is utilized to input the value from the user.

**Output:**

The above output shows the value taken from the user and displayed on the screen using the “print()” function.

**Example: Taking Input From User to Perform Mathematical Computation**

The prompt of the “**input()**” function always returns the value in string form. To perform any mathematical calculation after taking a value from the user, you need to convert it into an integer or float using the “int()” and “float()” functions.

**Code:**

```
x = input('Enter First Number: ')
y = input('Enter Second Number: ')
output = int(x)*int(y)
print('Multiplication of Input Number: ', output)
```

In the above code, the input() function takes the numeric value from the users and is stored in a variable “**x**” and “**y**”. To perform mathematical computation, the “**numeric string**” is converted into an “**int**” by utilizing the “**int()**” function. The “**print()**” accepts the output variable as an argument and displays the multiplication result on the console screen.

**Output:**

The above output shows that the multiplication of two input numbers has been calculated successfully.

**Conclusion**

The “**name raw_input is not defined**” error arises when the user uses the “**raw_input()**” function in Python**3**. To solve this, use the simple “**input()**” function that takes the “**prompt**” value as an argument and returns the string. This article presented a detailed guide to the reason and solutions of “NameError: name raw_input is not defined” in Python. Additionally, an example is also provided, which shows the working of the “input()” function.