How to fix the dreaded UnboundLocalError: local variable referenced before assignment” after an if statement.
In the following if statement I was getting UnboundLocalError for the variable matched
if form.validate():
url = form.sellers_json_url.data
r = requests.get(url)
if r.status_code == 200:
data = r.json()
sellers = data.get("sellers")
else:
print(f"ERROR: {r.status_code}, {r.reason}")
""" running data analysis on seller.json from data.py """
try:
connect_to_presto()
matched = pp_sjson_comparison(data)
except KeyError as err:
print(err)Reason for this, was because this variable would only come into play if the request was successful. To resolve this issue, I had to assign the variable before the if statement and give it a None value like so:
matched = None # here it's assigned before it's called.
if form.validate():
url = form.sellers_json_url.data
r = requests.get(url)
if r.status_code == 200:
data = r.json()
sellers = data.get("sellers")
else:
print(f"ERROR: {r.status_code}, {r.reason}")
""" running data analysis on seller.json from data.py """
try:
connect_to_presto()
matched = pp_sjson_comparison(data)
except KeyError as err:
print(err)