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Handle errors gracefully in Python using `exit_on_error` for smooth script execution.

# Using python exit_on_error

To understand how to use `exit_on_error` in Python, let’s first look at the provided context regarding sending and receiving values using the `requests` library in Python.

### Sending Values Example in Python
In the context provided, a function `set_camera_value` is defined to send values by making an HTTP request using the `requests` library. The function takes a URL as an argument and appends `?set=value` to the URL for changing values. Here is the function definition:

“`python
def set_camera_value(URL):
try:
response = requests.get(URL)
if response.status_code == 200:
print(“SET parameter Complete”)
return True
else:
print(f”SET Parameter FAIL. Status code: {response.status_code}”)
return False
except Exception as e:
print(f”set_camera_value Error: {e}”)
return False
“`

### Receiving Values Example in Python
Similarly, a function `get_camera_value` is defined to receive values by sending an HTTP request and parsing the data. The function takes a URL as an argument and then parses the response to get the desired value. Here is the function definition:

“`python
def get_camera_value(URL):
try:
response = requests.get(URL)
root = ET.fromstring(response.content)
if response.status_code == 200:
get_value = root.find(“.//xsi:value”, namespaces={“xsi”: “http://www.w3.org/2001/XMLSchema-instance”}).text
return get_value
else:
print(f”Request failed with status code: {response.status_code}”)
return None
except Exception as e:
print(f”get_camera_value Error: {e}”)
return None
“`

### Additional Parsing Step
After receiving the value in the `get_camera_value` function, there is an additional step where the value is parsed from the XML response. Here is the relevant code snippet:

“`python
root = ET.fromstring(response.content)
get_value = root.find(“.//xsi:value”, namespaces={“xsi”: “http://www.w3.org/2001/XMLSchema-instance”}).text
“`

### Conclusion
In conclusion, to use `exit_on_error` in Python, you can incorporate error handling mechanisms like `try-except` blocks as shown in the provided examples. By handling exceptions appropriately and returning error codes or messages, you can control the flow of your Python script based on error conditions. Make sure to import the necessary libraries like `requests` for making HTTP requests and `xml.etree.ElementTree` for parsing XML responses.