Logging Code Snippets

Author: CoreyMSchafer

Logging-Advanced/employee.py

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+import logging
+
+logger = logging.getLogger(__name__)
+logger.setLevel(logging.INFO)
+
+formatter = logging.Formatter('%(levelname)s:%(name)s:%(message)s')
+
+file_handler = logging.FileHandler('employee.log')
+file_handler.setFormatter(formatter)
+
+logger.addHandler(file_handler)
+
+
+class Employee:
+    """A sample Employee class"""
+
+    def __init__(self, first, last):
+        self.first = first
+        self.last = last
+
+        logger.info('Created Employee: {} - {}'.format(self.fullname, self.email))
+
+    @property
+    def email(self):
+        return '{}.{}@email.com'.format(self.first, self.last)
+
+    @property
+    def fullname(self):
+        return '{} {}'.format(self.first, self.last)
+
+
+emp_1 = Employee('John', 'Smith')
+emp_2 = Employee('Corey', 'Schafer')
+emp_3 = Employee('Jane', 'Doe')

Logging-Advanced/log-sample.py

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+import logging
+import employee
+
+logger = logging.getLogger(__name__)
+logger.setLevel(logging.DEBUG)
+
+formatter = logging.Formatter('%(asctime)s:%(name)s:%(message)s')
+
+file_handler = logging.FileHandler('sample.log')
+file_handler.setLevel(logging.ERROR)
+file_handler.setFormatter(formatter)
+
+stream_handler = logging.StreamHandler()
+stream_handler.setFormatter(formatter)
+
+logger.addHandler(file_handler)
+logger.addHandler(stream_handler)
+
+
+def add(x, y):
+    """Add Function"""
+    return x + y
+
+
+def subtract(x, y):
+    """Subtract Function"""
+    return x - y
+
+
+def multiply(x, y):
+    """Multiply Function"""
+    return x * y
+
+
+def divide(x, y):
+    """Divide Function"""
+    try:
+        result = x / y
+    except ZeroDivisionError:
+        logger.exception('Tried to divide by zero')
+    else:
+        return result
+
+
+num_1 = 10
+num_2 = 0
+
+add_result = add(num_1, num_2)
+logger.debug('Add: {} + {} = {}'.format(num_1, num_2, add_result))
+
+sub_result = subtract(num_1, num_2)
+logger.debug('Sub: {} - {} = {}'.format(num_1, num_2, sub_result))
+
+mul_result = multiply(num_1, num_2)
+logger.debug('Mul: {} * {} = {}'.format(num_1, num_2, mul_result))
+
+div_result = divide(num_1, num_2)
+logger.debug('Div: {} / {} = {}'.format(num_1, num_2, div_result))

Logging-Basics/employee.py

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+
+import logging
+
+logging.basicConfig(filename='employee.log', level=logging.INFO,
+                    format='%(levelname)s:%(message)s')
+
+
+class Employee:
+    """A sample Employee class"""
+
+    def __init__(self, first, last):
+        self.first = first
+        self.last = last
+
+        logging.info('Created Employee: {} - {}'.format(self.fullname, self.email))
+
+    @property
+    def email(self):
+        return '{}.{}@email.com'.format(self.first, self.last)
+
+    @property
+    def fullname(self):
+        return '{} {}'.format(self.first, self.last)
+
+
+emp_1 = Employee('John', 'Smith')
+emp_2 = Employee('Corey', 'Schafer')
+emp_3 = Employee('Jane', 'Doe')

Logging-Basics/log-sample.py

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+
+import logging
+
+# DEBUG: Detailed information, typically of interest only when diagnosing problems.
+
+# INFO: Confirmation that things are working as expected.
+
+# WARNING: An indication that something unexpected happened, or indicative of some problem in the near future (e.g. ‘disk space low’). The software is still working as expected.
+
+# ERROR: Due to a more serious problem, the software has not been able to perform some function.
+
+# CRITICAL: A serious error, indicating that the program itself may be unable to continue running.
+
+logging.basicConfig(filename='test.log', level=logging.DEBUG,
+                    format='%(asctime)s:%(levelname)s:%(message)s')
+
+
+def add(x, y):
+    """Add Function"""
+    return x + y
+
+
+def subtract(x, y):
+    """Subtract Function"""
+    return x - y
+
+
+def multiply(x, y):
+    """Multiply Function"""
+    return x * y
+
+
+def divide(x, y):
+    """Divide Function"""
+    return x / y
+
+
+num_1 = 20
+num_2 = 10
+
+add_result = add(num_1, num_2)
+logging.debug('Add: {} + {} = {}'.format(num_1, num_2, add_result))
+
+sub_result = subtract(num_1, num_2)
+logging.debug('Sub: {} - {} = {}'.format(num_1, num_2, sub_result))
+
+mul_result = multiply(num_1, num_2)
+logging.debug('Mul: {} * {} = {}'.format(num_1, num_2, mul_result))
+
+div_result = divide(num_1, num_2)
+logging.debug('Div: {} / {} = {}'.format(num_1, num_2, div_result))

Logging-Basics/snippets.txt

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+
+# DEBUG: Detailed information, typically of interest only when diagnosing problems.
+
+# INFO: Confirmation that things are working as expected.
+
+# WARNING: An indication that something unexpected happened, or indicative of some problem in the near future (e.g. ‘disk space low’). The software is still working as expected.
+
+# ERROR: Due to a more serious problem, the software has not been able to perform some function.
+
+# CRITICAL: A serious error, indicating that the program itself may be unable to continue running.