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python-data-engineer/11-Python-Blocks/try-except-2.py at main · gkdevops/python-data-engineer · GitHub
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11-Python-Blocks
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try-except-2.py
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import
json
def
process_json_file
(
filepath
):
"""
Attempts to load, parse, and process data from a JSON file.
Demonstrates comprehensive try-except-else-finally blocks.
"""
print
(
f"
\n
--- Processing file:
{
filepath
}
---"
)
data
=
None
file_handle
=
None
# To demonstrate finally closing it
try
:
# Attempt to open the file
print
(
"Attempting to open file"
)
file_handle
=
open
(
filepath
,
'r'
)
print
(
"File opened successfully."
)
# Attempt to parse JSON from the file
print
(
"Attempting to parse JSON..."
)
data
=
json
.
load
(
file_handle
)
print
(
"JSON parsed successfully!"
)
# Attempt to access specific data (potentially problematic)
print
(
"Attempting to access specific data fields..."
)
name
=
data
[
'name'
]
# Common key
age
=
data
[
'age'
]
# Might be missing or wrong type
print
(
f" Name:
{
name
}
"
)
print
(
f" Age:
{
age
}
"
)
# Intentionally try an operation that might cause TypeError if 'age' is not a number
age_in_5_years
=
age
+
5
print
(
f" Age in 5 years:
{
age_in_5_years
}
"
)
except
FileNotFoundError
:
print
(
f"ERROR: The file '
{
filepath
}
' was not found."
)
except
PermissionError
:
print
(
f"ERROR: Permission denied to read the file '
{
filepath
}
'."
)
except
json
.
JSONDecodeError
as
e
:
print
(
f"ERROR: Could not decode JSON from '
{
filepath
}
'. Invalid JSON format."
)
print
(
f" Details:
{
e
.
msg
}
at line
{
e
.
lineno
}
column
{
e
.
colno
}
(char
{
e
.
pos
}
)"
)
except
KeyError
as
e
:
print
(
f"ERROR: A required key
{
e
}
was not found in the JSON data from '
{
filepath
}
'."
)
if
data
:
# If data was loaded but key is missing
print
(
f" Available keys:
{
list
(
data
.
keys
())
}
"
)
except
TypeError
as
e
:
print
(
f"ERROR: A type mismatch occurred while processing data from '
{
filepath
}
'."
)
print
(
f" Details:
{
e
}
"
)
print
(
f" Value causing error might be '
{
age
}
' of type
{
type
(
age
)
}
when an operation expected a different type."
)
except
Exception
as
e
:
# Catch-all for any other unexpected errors
print
(
f"AN UNEXPECTED ERROR OCCURRED while processing '
{
filepath
}
':
{
e
}
"
)
print
(
f" Error type:
{
type
(
e
).
__name__
}
"
)
else
:
# This block executes if NO exceptions were raised in the try block
print
(
"SUCCESS: JSON data processed without any critical errors mentioned above."
)
# You could do further processing here that depends on the success of the try block
finally
:
# This block ALWAYS executes, regardless of whether an exception occurred or not
print
(
"Finally block: Attempting to clean up resources..."
)
# You could perform some tasks which are needed to perform at the end of code execution.
# --- Main execution ---
if
__name__
==
"__main__"
:
# 1. Test with a valid JSON file
process_json_file
(
"valid_data.json"
)
# 2. Test with a file that has invalid JSON syntax
process_json_file
(
"invalid_syntax.json"
)
# 3. Test with a file that doesn't exist
process_json_file
(
"non_existent_file.json"
)
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