In Python there are a set of 9 exit codes running from 0-8, these exit codes can be helpful to who was the execution of a Python program succession without any error, or if there was an error what was the error related to.
The below table covers the list of all exit codes and their meaning and example of their occurrences.
Exit Code | Meaning | Occurrences |
---|---|---|
0 | Successful execution with no errors | Example: Program completed successfully |
1 | Generic or unspecified error | Example: Unclassified or miscellaneous errors |
2 | Command line syntax error or improper usage | Example: Invalid command line arguments or options |
3 | Missing file or resource | Example: File not found or required resource unavailable |
4 | Input/output (I/O) error | Example: Failed input/output operations (e.g., file reading) |
5 | Operating system or system-related error | Example: System-related failures (e.g., permission denied) |
6 | User interrupt | Example: User interruption (e.g., keyboard interrupt) |
7 | Improper software/library version | Example: Incompatibility or incorrect software version |
8 | Unhandled exception or software bug | Example: Uncaught exceptions or unexpected software errors |
Example: Exit Code 0: Successful execution with no errors
print("Hello there")
# python3 sample.py
Hello there
# $?
0
Example: Exit Code 1: Generic or unspecified error:
import sys
print("An unspecified error occurred while executing the Python program.")
sys.exit(1)
# python3 sample.py
An unspecified error occurred while executing the Python program.
# echo $?
1
Example:
import sys
print(sys.argv[2])
# python3 sample.py 12
Traceback (most recent call last):
File "/Users/c2ctechtv/Desktop/sample.py", line 3, in <module>
print(sys.argv[2])
IndexError: list index out of range
# echo $?
1
Example: Exit Code 2: Command line syntax error or improper usage:
import sys
if len(sys.argv) < 2:
print("Please provide all input parameters.")
sys.exit(2)
# python3 sample.py 1
Please provide all input parameters
# echo $?
2
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