Cannot Unpack Non-iterable Nonetype Objects in Python
Last Updated :
08 Mar, 2024
The “Cannot Unpack Non-iterable NoneType Objects” error is a common issue in Python that occurs when attempting to unpack values from an object that is either None
or not iterable. This error often arises due to incorrect variable assignments, function returns, or unexpected results from external sources. In this article, we will explore some code examples that demonstrate situations leading to this error and how to handle them effectively.
Cannot Unpack Non-iterable Nonetype Objects in Python
Below, are the situations of Cannot Unpack Non-iterable Nonetype Objects in Python.
Unpacking NoneType Object
In this example, the get_values
the function does not have a return statement, resulting in the function returning None
. When attempting to unpack values from None
, the error occurs.
Python3
def get_values():
return
result = get_values()
try :
a, b = result
except TypeError as e:
print (f "Error: {e}" )
|
Output
Error: cannot unpack non-iterable NoneType object
Incorrect Function Return
In this example, below code defines a function get_values
that incorrectly returns a non-iterable value (integer 42). When attempting to unpack the result into variables a
and b
, the code raises a “Cannot Unpack Non-iterable NoneType Objects” error, as the returned value is not iterable.
Python3
def get_values():
return 42
result = get_values()
try :
a, b = result
except TypeError as e:
print (f "Error: {e}" )
|
Output
Error: cannot unpack non-iterable int object
Unexpected API Response
In this example, below code defines a function fetch_data
that makes an API request to “https://example.com/api/data” and returns the JSON response. If the API request fails (status code not 200), it returns None
. The subsequent attempt to unpack values from the API response into variables a
and b
may raise a “Cannot Unpack Non-iterable NoneType Objects” error if the API response is None
.
Python3
import requests
def fetch_data():
if response.status_code ! = 200 :
return None
return response.json()
data = fetch_data()
try :
a, b = data
except TypeError as e:
print (f "Error: {e}" )
|
Output
Error: cannot unpack non-iterable NoneType object
Handling NoneType Before Unpacking
In this example, below code defines a function get_values
without a return statement, resulting in it returning None
. To prevent a “Cannot Unpack Non-iterable NoneType Objects” error when attempting to unpack values, the code checks if the result is not None
before performing the unpacking.
Python3
def get_values():
return
result = get_values()
if result is not None :
a, b = result
else :
print ( "Error: Unable to unpack, result is None" )
|
Output
Error: Unable to unpack, result is None
Conclusion
In Conclusion , The “Cannot Unpack Non-iterable Nonetype Objects” error is a common error that is faced in Python programming, commonly caused by functions returning None instead of iterable objects or by erroneous variable assignments. Coders can avoid this issue and guarantee that their Python code runs smoothly by carefully inspecting the return values, and proper error handling.
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