What Is User Input in Python?

by | Mar 24, 2021 | Uncategorized | 0 comments

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What Is User Input in Python?

Developers need to communicate with users to collect data or to generate results. Many applications today use different ways to request a certain form of input from the user. Python offers us integrated features to take the input. The latest version of Python uses the input() method while the earlier version uses the raw_input() method. 

To do this, whave to click the Enter button after entering the value from the keyboard. The input() function then reads the user’s value. The input function reads a line from the console, then converts it to a string, and returns it. 

The syntax of input() function is: 

In the console, the prompt string is printed and the user is given the command to enter the value. You should print some useful information to help the user enter the expected value. 

The input() function receives the user input from the keyboard and stores it into a variable name. Herestris a variable and the print() function prints it to the screen. Getting User Input in Python

The input() function delays execution of a program to allow the user to type the input from the keyboard. On pressing Enter, all characters are reads and returns as a string.

Example:

Here is an example of getting the user input and printing it on the console. 

Output: 

We will use float() function to convert the received input into a float value. 

Example:

Output: 

The input function converts whatever you enter as an input into a string. If you enter an integer value, the input() function will convert it to a string. 

To use the integers, we can use the built-in functions to convert it into an int. 

Example: 

Output: 

Example: 

Output: 

Integer as the User Input example

EOFError in python is one of the exceptions to handlerrors and is raised in scenarios such as the interruption of the input() function in both python version 2.7 and python version 3.6, as well as other versions after version 3.6 or when the input() function reaches the unexpected end of the file in python version 2.7, i.e. the functions do not read any data before the end of the input is encountered.  

Methods such as read() must return a string that is empty at the end of the file, which is inherited in Python from the exception class that is inherited in BaseException class. This mistake often happens with online IDEs. 

If theinput()function did not read any data then the python code will throw an exception i.e. EOFError. 

Output: 

If End of file Error or EOFError occurs, the exception EOFError is raised without reading any information by the input() function. We should try to enter something like CTRL + Z or CTRL + D before submitting the End of file exception to prevent the raising of this exception. 

Example: 

Output: 

Explanation: In the above program, try to prevent the EOFError exception with an empty string, which doesn’t print the error message of the End Of File and rather prints the personalised message that is shown in the programand prints the same on the output.

You can use the try and catch block if the exception EOFError is processed. 

Python provides a multiple-choice input system. You have to first get the keyboard input by calling theinput()function. Then evaluate the choice by using the if-elif-else structure. 

Output: 

 User Input Choice Example

Python raw_input function is a built-in function used to get the values from the user. This function is used only in the older versions of Python i.e. Python 2.x version.  

Python 2 must be installed in your system in order to use the raw input()function. Use python2 instead of python or Python3 if you run your programfrom a terminal. Therefore, the execution sample command is: 

It depends on how your python haveinstalled. In conclusion, you must run your programusing the version python 2.x if you use raw_input function. 

You can modify your python compiler if you use PyCharm IDE. Go to File > Configuration -> Project -> Project Interpreter for that purpose. Then selectpython 2.x from the list.

Example 1: 

We will see a code written in Python 2.x version. 

Output: 

Example 2: 

Output: 

The “Jenny” value is taken from the user in the value1variable here and stored in the value1. String for raw input function is always the type of value stored. The value 9876 is takenfrom the user and storedin the variable value2. The variable value2 type is a string now and the type needs to be converted to an integer with int(). The value2 variable saves an integer type for the value “9876.” 

The function raw input() was deactivated and removed from Python 3. You can update now if you’re still on a Python 2.x. 

Conclusion: 

  • The BaseException class inherits the EOFError class as the base class of the Exception class. 
  • EOFError technically is not an error, but an exception. When the built-in functions, such as the input() function or read() function returns a string that is empty without reading any data, the EOFError exception is raised. 
  • This exception is raised if our software tries to retrieve anything and make changes to it, but if no data is read and a string is returned, the EOFError exception is raised. 
  • Two functions are available in Python 2.x to take the user value. The first is the input function and the second is the raw_input() function.  
  • The raw_input function in python 2.x is recommended for developers. This is because the input function is vulnerable in version 2.x of Python.
  • A basic framework for user input is provided by Python. The input function reads and converts a line from the console into a string. 
  • The input function converts all the information it receives to a string format. To convert the input to the correct format, we use a conversion type. 
  • It is used mainly to provide the user with an option of action and then adjust the programflow accordingly. 
  • The software, therefore, waits for the user’s input indefinitely. If the user did not enter the value in time, it would have been good to have a timeout and default value. 
  • EOFError technically is not an error, but an exception. When a string that is open without reading data is returned by inbuilt functions, such as input() or read(), then the exception with the EOFError is raised. 
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