Python Errno

Each computing language includes a built-in system for managing errors and some are even pre-programmed into the compiler. We possess connections in Python which are connected to various common predetermined error codes. In this article, we’ll look at how to locate both built-in error codes and error numbers by considering an application of the error code after that. Whenever a function in the Python programming language is called, the global parameter errno is dynamically given a signal (value) which is used to determine the category of error that occurred. It is a public variable which is declared in the headers file errno that indicates whether an error is encountered during any procedure call.

Numerous metaphorical error codes are defined in the errno module. Additionally, a lexicon mapping platform-specific arithmetic error codes to abstract identities are provided. Errno might be macro and it should never be overtly specified. Fixing errno in a single instance does not affect its quantity in many other threads because it is thread-local. Error designations and integers, and all legitimate error reports are positive. Every coding language that exists should have errors. Bugs in Python typically happen when a specific code section does not follow the recommended usage. Programmers frequently get into issues with indentation, syntax, and other things.

How to Implement the Python Errno

This is merely a listing of the built-in error statistics and error codes in this software. In addition to the “OS” module, we can also employ the “no module” error. It’s important to understand that we won’t become expert programmers in a certain computing language until we meet a lot of faults in the code. We look for the source of new errors as soon as we encounter them. Eventually, we begin looking into how to correct the error.

Let us start implementing our code for Python starting by importing the library of “errno” to check the error count in the code. The second library that we import is “OS” for having its interaction with our computer system. Now, we use a “w” variable which is declared and used with the “for” condition. We also use the “sorted()” function for having each error number in a sorted or arranged form. We call the “errno.errorcode” as our main module in the “sorted()” function. After the implementation of the main program module, we use the “print()” function and call the “w” variable within the “print()” statement along with the “os.sterror()” function on the “w” variable for all the numerous error that are generated here.


import errno
import os
for w in sorted(errno.errorcode):

The given code for “errno” is also given in the following for the other users to use and operate for their error count in the running program.

After the implementation of the code, we receive almost “10093” errors occurring in our system code. We display a few of them in this article that is mainly to be discussed. It’s not possible to display all the errors in the output display. In the first display, the main Errno generates from the “1” index which includes the operation being not permitted, no file directory, bad file descriptor, and many others, which we can see in the following display:

Further errors that arise are displayed in the following for the errno module of Python:

The last errors that are generated in the last column list of “10061” to “10093” are the unknown errors that are followed out by the Python errno.

To describe it more elegantly, we use another example with the different scenario of the Python errno. Let us start implementing the Python code for it on the “Spyder” tool where we use the “try” and “except” statements. In the “try” statement, we create a function named “Our_FILE” using the “open()” function and provide the file name “Treasa.txt” in this function. Since this file is not present in the directory, we use the absent file name and see what happens and how errno handles the error.

Now, in the code, we use “IOError” in the “except” condition and store it in the “y” variable. Now, we use the “if” statement with “y” variable along with the errno module and assign it with “2”. In this step, we use the “print()” function twice where the first “print()” function has a value called “y.strerror”. The second function has a print statement such as “We Didn’t Find Any File…!”. Now, we use “elif” on the “y” variable with errno and assign it the value of “8”. Two “print()” functions are used in the last two steps of the code. The first “print()” function is called “y” variable with the strerror module and the other “print()” function is with the print statement of “The Respective File Will Not Be Printed…!”.

The code for errno is granted in the following for the other users to utilize and run it on their own to understand it in a better way:


Our_FILE = open('Treasa.txt')
except IOError as y:
if y.errno == 2:
print("We Didn't Find Any File...!")
elif y.errno == 8:
  print("The Respective File Will Not Be Printed...!")

After the code compilation, we hold the following in the output display. Since the file is not created in the directory, it displays “No such file or directory”. Only one statement is printed from the “print()” function of the “if” statement.

The last example that we took here is similarly importing the same “errno” library along with the library of “sys” which is required only with the interaction of the system. After the import of both “sys” and “errno” libraries, we use the “try” and “except” conditions where we define the “p” variable in “try” with the “for” condition and set the range to “15” for the errno variable which runs by utilizing the “range()” parameter. Then, after setting the range, we use the “print()” function and call the “p” variable inside the “print()” function for the final result value to appear on the output screen.

After that, we define the “IOError” in “except” as the “p” variable which is defined earlier. We use the “if” conditional statement on the “p” variable with errno and assign it to equalize to the” errno.EPIPE”. In the last step, we use a “pass” statement to not proceed further with the program after both conditions.


import sys
import errno
for p in range(15):
except IOError as p:
if p.errno == errno.EPIPE:

The given code on the third example of “errno” in Python is present on the snapshot display and is provided in the following for all users to try this example on their own to understand it in a better way.

After completing the code work, we implement it in the Python “Spyder” tool and get the following output where it generates its iteration “15” times and where the index is started from the “0” and ends up on “14”. Since there is a total “of 15” iterations, there would be minimal “15” chances of error generation. But that is properly handled by the concept of error handling.


In our article, we elaborated on the topic of Python “errno” where we used three examples to describe this topic. The first example described the total number of errors to be generated in our sequence code. In the second example, we have seen how to overlook the error that is generated by the absent file of any directory. The third or last example of Python showed us the error handling or exception handling procedure which includes some conditional statements along with the “elif”, “try”, and “except” conditions.

About the author

Aqsa Yasin

I am a self-motivated information technology professional with a passion for writing. I am a technical writer and love to write for all Linux flavors and Windows.