Python Error Handling Best Practices Professional!
Complete Python Bootcamp From Zero to Hero in Python (Error Handling)
Contents
1. Errors and Exception Handling
1.2 try and except and finally
2. Unit testing
2.1 Pylint
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1.1 try and except and else
def my_func(n):
result = n + 2
return result
try:
my_func(2)
except:
print(‘Not Added Correctly!’)
else:
print(‘Added Correctly!’)
print(my_func(2))
# note: Try to input myfunc(‘a’) and see what happens
—————————————————————–
try:
f = open(‘testfile.txt’, ‘w’)
f.write(‘Test write this’)
except IOError:
# This will only check for an IOError exception and then execute this print statement
print(“Error: Could not find file or read data”)
else:
print(“Content written successfully”)
f.close()
# output: Content written successfully
# note: to create testfile.txt and write inside
—————————————————————–
try:
# to create testfile.txt and write inside
f = open(‘testfile.123’, ‘r’)
f.write(‘Test write this’)
except IOError:
# This will only check for an IOError exception and then execute this print statement
print(“Error: Could not find file or read data”)
else:
print(“Content written successfully”)
f.close()
# output: Error: Could not find file or read data
# note: because no available file to read
—————————————————————–
1.2 try and except and finally
try:
f = open(“testfile”, “w”)
f.write(“Test write statement”)
f.close()
finally:
print(“Always execute finally code blocks”)
—————————————————————–
try:
# to create testfile.txt and write inside
f = open(‘testfile’, ‘w’)
f.write(‘Test write this 3’)
except:
# This will only check for an IOError exception and then execute this print statement
print(“Error: Could not find file or read data”)
finally:
print(“Content written successfully”)
—————————————————————–
def ask_int():
try:
val = int(input(“Please enter an integer: “))
except:
print(“Looks like you did not enter an integer!”)
val = int(input(“Try again-Please enter an integer: “))
finally:
print(“Finally, I executed!”)
print(val)
ask_int()
—————————————————————–
def ask_int():
while True:
try:
val = int(input(“Please enter an integer: “))
except:
print(“Looks like you did not enter an integer!”)
continue
else:
print(“Yep that’s an integer!”)
break
finally:
print(“Finally, I executed!”)
print(val)
ask_int()
—————————————————————–
2 Unit Testing
It is important as writing good code is writing good tests. Better to find bugs yourself than have them reported to you!
For now what we have is pep8 and pylint
2.1 Pylint
Static Code Checker and Code Analysis
install pylint using anaconda
create ‘simple1.py’ then add this:
“””
A very simple script.
“””
def myfunc():
“””
An extremely simple function.
“””
first = 1
second = 2
print(first)
print(second)
myfunc()
—-
Go to terminal then type: ‘pylint simple1.py’ then see the result
Check files here
—————————————————————–
create ‘simple2.py’ then add this:
“””
A very simple script.
“””
def myfunc():
“””
An extremely simple function.
“””
first = 1
second = 2
print(first)
print(‘second’)
myfunc()
—-
Go to terminal then type: ‘pylint simple2.py’ then see the result
Check files here
—————————————————————–
2.2 Using unittest library
Create cap.py then add this:
import string
def cap_word(text):
return string.capwords(text) # Capitalize each word
def cap_first_word(text):
return text.capitalize() # Capitalize first word in sentence
—————————————————————–
Create cap_test.py then add this:
import unittest
import cap
class TestCap(unittest.TestCase):
def test_one_word(self):
text = ‘python’
result = cap.cap_word(text)
self.assertEqual(result, ‘Python’)
def test_multiple_words(self):
text = ‘monty python’
result = cap.cap_word(text)
self.assertEqual(result, ‘Monty Python’)
def test_with_apostrophes(self):
text = str(“monty python’s flying circus”)
result = cap.cap_word(text)
self.assertEqual(result, “Monty Python’s Flying Circus”)
if __name__ == ‘__main__’:
unittest.main()
Then run your cap_test.py and see result
Make this the year that you took a risk, you learned highly in demand skills, you had new experiences, and you received new opportunities. I hope you join me in this journey.
Python Error Handling Best Practices – Studies Show!
This is the proudest work I have ever done in my life and I am confident that you won’t find a course better than this.
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Python Error Handling Best Practices – Brainy Secrets!
