Motivational Quotes

Hello World!, You are about the witness the beginning of an epic third coming of the 100-Day coding journey, A story that great sages will pass down from generation to generation. This quest will feature a potpourri of unfiltered joy, unrivaled pain, and unexpected epiphanies.

Some moments, I will be the smartest man alive. Others moments, I will be a stupid idiot. But each day, I will be a valiant warrior, fighting to develop and perfect the skills necessary to evolve into a true beast with these keys.

I have failed in my previous attempt for the challenge, which you can find here.

There are learning from the previous failure, here are the modification which was done to the challenge according to my handicap.

Ladies and gentleman, I present to you, #100DaysofCode with @ animeshkbhadra


Day 45 | Thursday August 8,2019

Days Progress

  • Always group the custom exceptions into a common module called exception in application.
  • The custom exception class name should always end with error or exception, signifying the purpose.

Custom Exceptions Application

Thoughts


Day 44 | Wednesday August 7,2019

Days Progress

  • Error Specificity
    • The order of catching Exception should be from specific to general.
    • The code should never be catching generic Exception.

error specificity

  • Custom Exceptions
    • We can raise our custom exception by inheriting from base class Exception.
    • The base Exception __init__() takes a custom message.
    • raise is the keyword to raise the custom exception.

Custom Exceptions

Thoughts


Day 43 | Monday August 5,2019

Days Progress

  • Exception is a great way to make the application more robust.
  • try/except are the tools to catch exceptions.
  • BaseException is the base class of all exception which should never be caught in our code.
  • Exception is the exception class which needs to be caught.
  • except takes a tuple of exception.

Exception

Thoughts


Day 42 | Thursday August 1,2019

Days Progress

  • Inheritance is the best way to share property and responsibility across the code.
    • Car has 4 wheels, but Bike has only 2 wheels, but most other parts are similar.
  • It creates code re-usability.
  • Divides the code from more generic to specific.
  • Multiple inheritance is possible, but mostly restricted to Mixins.

inheritance

Thoughts


Day 41 | Wednesday July 31,2019

Days Progress

  • str():
    • On our raw object, is we use str() it gives a completely non-relevant information.
    • We can change this by overriding the __str__() method in our class.
  • repr():
    • Its informs a way of creation of the object.
    • We can override __repr__ method in our class for this information.

__str__ and __repr__

Thoughts


Day 40 | Monday July 29,2019

Days Progress

  • isinstance() :
    • returns True if an object is an instance of a class.
  • issubclass() :
    • returns True is an object is a subclass of a class.
    • bool is a subclass and instance of int
    • object is the parent class of all object.
  • any() :
    • returns True, if any value in the collection is True.
  • all() :
    • returns True, if all the value in the collection is True.
  • bool :
    • bool being a subclass of int, we have some weird combination, which we can try.
      • True + True : 2
      • {0,1, True, False}: returns {0, 1}

Class isinstance and isSubclass

Thoughts


Day 39 | Sunday July 28,2019

Days Progress

  • Class methods are unique methods, which operates on class variables.
  • @classmethod : a special decorator to create a class method.
  • Class methods take cls as argument and not self.
  • The instance object can access the class methods, since it is aware of their existence.

Class Method

Thoughts


Day 38 | Saturday July 27,2019

Days Progress

  • The journey into object oriented programming with python.
  • Python has no protection of its class variables for modification unlike Java.
  • __init__(self)
    • It is special function which python calls under the hood when initializing a object.
    • It takes self by default.

dunder init

Thoughts


Day 37 | Friday July 26,2019

Days Progress

  • OOPs concept.
  • Everything is an object in Python.
  • Class is template, blue print of a object.
  • Instance is a specific creation of a class.
  • We can have both
    • Class Variables
      • Accessed by class.
    • Instance Variable
      • Accessed by instance of a class.
  • self is a special name given to a instance in python.

Class

Thoughts


Day 36 | Thursday July 25,2019

Days Progress

  • .items() on a dict() returns a list of tuples.
  • A list of tuples can also be converted back to a dictionary.
  • zip() function combines two lists into a list of tuples.
    • for loop can be used to iterate over a zip function.
    • Using zip() on asymmetrical list will create a list of tuples with the least no of elements common in the list.
    • dict(zip(list1, list2)) : converts a list of tuple back to a dictionary.

Zip Function

Thoughts


Day 35 | Wednesday July 24,2019

Days Progress

  • Enhanced the learning of list slice.
  • Simple index gives an element of the list.
  • The slice has the following format.
    • [1:3] : the index will start from 1, ends at 3 - 1 = 2
      • No of elements will be 3 - 1 = 2
  • Slice also supports negative index.
    • -1 : give the last element
    • -len(list) : gives the first element
  • Slice also has 3rd index, which is step.
    • [::2] : skips 2 elements.
    • [::-1] : short cut to reverse a list.

List Slice

Thoughts


Day 34 | Tuesday July 23,2019

Days Progress

  • Today is the day, when I am more confused than aware.
  • There is no tuple comprehension in python, but there are Generator expressions.
  • Generator expressions are created with this syntax.
    • (num * num for num in range(11))
      • Ideally we expect it to be a tuple comprehension, but it is a generator object.
  • Generator expressions are a memory efficient way of creating a big list.
  • We cannot index on the generator object, gives a TypeError.
  • next() and for/each can be used to iterate over a generator.

Generator comprehensions

Thoughts


Day 33 | Monday July 22,2019

Days Progress

  • The set and dict comprehensions are very similar in syntax.
    • set comprehensions.
      • {num * num for num in range(11)}
    • dict comprehensions.
      • {num: num * num for num in range(11)}
  • Both set and dict comprehensions are not ordered.

Set comprehensions

Thoughts


Day 32 | Friday July 19,2019

Days Progress

  • Built-in function which works on the list
    • sum() : returns the sum of a list
    • min() : returns the smallest element in the list.
    • max() : returns the biggest element in the list.
    • sorted() : returns a sorted list.
      • reverse=True as a default argument will reverse the list.

List comprehensions

Thoughts


Day 31 | Thursday July 18,2019

Days Progress

  • Continued with List comprehensions.
  • We can use conditionals in list comprehension to filter values.
    • [num**2 for num in numbers if num %2 == 0]
      • The conditional comes at the end.
      • This conditional works as a filter.
  • We have 3 ways to use List comprehensions.
    • Map - All values are used
    • Filter - Some values are used
    • Map/Filter - Some values filtered and then modified.

List comprehensions

Thoughts


Day 30 | Tuesday July16,2019

Days Progress

  • There are various type conversion which we can use.
    • split() : convert string to a list.
    • join() : convert a list to string. ",".join(my_list)
    • tuple unpacking can also be used when using .split()
  • Learned about list comprehensions.
    • [num**2 for num in numbers] : list of square of numbers.
      • We right the square brackets first
      • Followed by the for loop.
      • The variable used in the for loop is available to the left of loop, num
      • Apply mapping on the variable left of for loop.
    • We can combine with tuple and f strings to get more valuable information.

List comprehensions

Thoughts


Day 29 | Saturday July 13,2019

Days Progress

  • Worked on the Github Api Project using these concepts.
    • requests
    • exceptions
    • APIs
    • Query Parameters.

Thoughts


Day 28 | Friday July 12,2019

Days Progress

  • learned mostly about requests library.
  • 4 HTTP methods
    • GET
    • POST
    • PUT
    • DELETE
  • HTTP code
    • 1XX : Information
    • 2XX : Success
    • 3XX : Redirection
    • 4XX : Client error
    • 5XX : Server error

Shibe URL for dogs

Thoughts


Day 27 | Thursday July 11,2019

Days Progress

  • __name__ is a nice way to put code when we want to execute as a script.
    • The above code is not invoked when called as a library.
  • try/except is a great way to catch error's in code, and give alternate execution path.

Thoughts


Day 26 | Wednesday July 10,2019

Days Progress

  • Mostly learned about python file's and debugging techniques.

Thoughts


Day 25 | Tuesday July 9,2019

Days Progress

  • while loop is used to iterate over numbers in place of sequence.
    • Also when we are not sure about the no of iteration
  • break:
    • It stops the execution of loop, and jumps to end of loop.
    • If present in nested loop, it breaks the loop it is present in.
  • continue:
    • It stops the loop execution and jump to start of the loop.
  • return:
    • It also return the loop control to outside of the loop.

break, continue and return statement.

Thoughts


Day 24 | Friday July 5,2019

Days Progress

  • Today's learning was mostly on the Control flow.
  • We have different variant of if condition.
    • if
    • if-else
    • if-elif-else
  • We can also check truthiness.

if statement.

Thoughts


Day 23 | Thursday July 4,2019

Days Progress

  • Continuing the process of learning loop, understood about looping with dict
  • There are mainly 3 looping with dict
    • .key() - this is default, so do not have to specify in for loop.
    • .items() - returns a tuple of key, value pair.
    • .values() - returns only the values in dict.
    • .enumerate(.items()) - gives, index and a tuple of key value.

dict loop.

Thoughts


Day 22 | Wednesday July 3,2019

Days Progress

  • Mostly improved the understanding of loops with list and range function.
  • for loops create a temporary variable which is in scope outside of for loop.
  • range() is a good function for looping, it has 3 variant.
    • range(5) : default, creates the number from 0 to 4
    • range(1,5) : start and end index, creates the number from 1 to 4, 5 non inclusive.
    • range(1,5,2) : the 3rd argument is steps, will step those many numbers.
    • It does not take any Keyword arguments.

list loop.

Thoughts


Day 21 | Monday July 1,2019

Days Progress

  • I have reached that day, where it is said, 21 days is required minimum to form a habit.
    • Hope this habit stays with me.
  • Learning continued on and, or, and not operator.
  • It was an eye opener.
  • and and or returns the value of one of the expression and not True or False
  • and
    • It returns the value of 2nd operand if the first operand is True else value of first.

and Operator.

  • or
    • It returns the value of 1st operand if it evaluates to True, else value of second.

or Operator.

  • not
    • Returns the inverse of the operator.

not Operator.

Thoughts


Day 20 | Sunday June 30,2019

Days Progress

  • Comparison operators in Python.
    • < : Less than
    • > : greater than
    • <= : less than equal to
    • >= : greater than equal to
    • == : equal to
    • != : Not equal to
    • is : Identity, when both object points to same.
  • Strings are compared based on their ASCII value.
    • The capital letters are smaller than small letters.

Comparison Operator.

Thoughts


Day 19 | Friday June 28,2019

Days Progress

  • What are the truthiness of various data types.
    • integers:
      • 0 is False
      • any other number is True
    • Collections:
      • Empty list, tuple, Dictionary, sets are False
      • Non Empty collections are True
    • Strings:
      • Empty String is False
      • Non Empty String are True.
    • None is False

Booleans truthiness.

Thoughts


Day 18 | Wednesday June 26,2019

Days Progress

  • Learned about the list slice.
    • my_list[0:3 : Returns 0 - 2nd index
    • my_list[:] : clone the entire list.
    • my_list[-1] : Special way to get the last item.

List Slice.

Thoughts


Day 17 | Tuesday June 25,2019

Days Progress

  • Finally crossed the last attempts days.
  • Learned about mutability.
  • Basic data type are immutable.
    • int, float, decimal, str, bool
  • Containers data type are divided
    • list, set, dict are mutable
    • tuple is immutable.

Thoughts


Day 16 | Monday June 24,2019

Days Progress

  • Adding/Accessing dictionary elements.
    • add new key/Value pair. nums["four"] = 4
    • There are no duplicate key in Dictionaries.
    • If new value is assigned to same key, it will override the old value.
    • Existence of a key in Dictionaries. "one" in nums
    • .update(): Combine two list.
    • 3 important functions on Dictionaries
      • .keys(): returns special list called dict keys
      • .values(): returns a special list called dict values
      • .item(): returns a list of tuple, called dict items

Dictionaries Operation

Thoughts


Day 15 | Sunday June 23,2019

Days Progress

  • Started learning about dictionaries.
  • Dictionaries store key:value pair.
  • Dictionaries are mutable but the keys are immutable.
  • The search is very fast, just like sets.
  • Retrieve the value with index as the key a["one"]
  • get() method can be used when we do not want an error while retrieving a value.
    • Its returns a default value if the key is not present.

Dictionaries Basics

Thoughts


Day 14 | Saturday June 22,2019

Days Progress

  • Important set operation.
    • union() or | : Returns the union of two sets.
    • intersection() or &: Returns the intersection of two sets.
    • difference() or -: present in 1 set but not in other.

set Operation

Thoughts


Day 13 | Thursday June 20,2019

Days Progress

  • Updated my RAM with set operation for CRUD.
    • add() - Adds item to the set.
    • discard() - Removes item from the set, if not present, gives no error.
    • remove() - Removes item from the set, if not present. gives KeyError.
    • update() - Adds item from a sequence into a set.

set crud

Thoughts


Day 12 | Wednesday June 19,2019

Days Progress

  • Understood the basic premise around sets.
    • Empty sets can only be created using set() function, empty {} creates a dict.
    • Sets stores only immutable data type which can give a hash() value.
      • a = {"a", (1, 2, 3), [1, 2, 3]} # TypeError: unhashable type: 'list'
    • Sets are used to remove duplicates from List.
    • Sets searching is very fast.
    • Sets do not have a indexing order.

set creation

Thoughts


Day 11 | Tuesday June 18,2019

Days Progress

  • Explored the different ways to create a tuple
    • Create a empty tuple.
      • a = tuple()
      • b = ()
    • Create a single item tuple.
      • a = (1,) and not
      • a = (1)
    • Brackets are not mandatory for tuple.
      • b = 1, 2, 3, 4, 5
    • indexing in tuple, same as list.
      • b[0]

tuple creation

Thoughts


Day 10 | Monday June 17,2019

Days Progress

  • Established some basic understanding on list operations
  • Operations to add item to the list.
    • append(): add an item to end of the list.
    • insert(2, "bbbb"): insert at an index.
    • extend(): concatenates two list.
  • Operation on list look-up, which is very slow, almost linear.
    • index(value): returns first index of value
      • ValueError: if the value is not present in list.
    • count(value): returns the no of times a value is present.
      • return's 0 is the value is not present.
  • Operation to remove item from list.
    • remove(value): removes the value from the list, if not present does not throw error.
    • pop(): remove and returns the last element of the list or the index.
  • List are heterogeneous.

Heterogeneous list.

Thoughts


Day 09 | Sunday June 16,2019

Days Progress

  • Understood the list's sort and the built-in sorted function.
  • sorted() returns a list
  • list.sort() or list.reverse() returns None

sorted() and built-in sort

Thoughts


Day 08 | Saturday June 15,2019

Days Progress

  • Started after a gap of 1 cheat day.
  • List was the focus today.
    • list can be created using [] or list()
    • list is a ordered collection.
    • list is a heterogeneous collection.
    • list elements can be accessed using index start at 0
  • List has 1 efficient way of declaring.
names = [
    "XXX",
    "YYY",
    "ZZZ",  # unlike json, we can have comma at the last element, 
            # it helps with git diff
]

Multi Line list declaration.

Thoughts


Day 07 | Thursday June 13,2019

Days Progress

  • Function scope is little confusing without practice.
    • There is a global scope and a local scope to a function.
    • If same variable name is same, local scope gets preference.
      • Global variable cannot be modified even thought it share the same name.
  • This code will work. Function Scope Working case.
  • But this code will not work, gives UnboundLocalError:. Function Scope Not Working case.
  • The explanation is mentioned in the Python Documentation.

Thoughts


Day 06 | Wednesday June 12,2019

List as a function argument. List as a function argument.

Days Progress

  • List or any other mutable data type should not be used as the default arguments.
    • The list is initialized when the function is called the 1st time, and then it modifies the same list.

Thoughts


Day 5 | Tuesday June 11,2019

Functions Arguments

Days Progress

  • Started with the Function's Arguments.
  • Positional arguments must be passed to functions.
  • Default arguments are always provide at the end of function's argument list.
  • We can give none, one, all arguments to a function with only default arguments list.
  • Labeled arguments can be passed in any order to a function.

Thoughts


Day 04 | Monday June 10,2019

Functions

Days Progress

  • Started the functions section of the lecture.
  • This lesson, teaches about different function type.
    • Function with no arguments and no return type
    • Function with no arguments and a return type
    • Function with 2 arguments and a return type
    • Function with multi-line function body.
    • return is always optional in function, it returns <class 'NoneType'>

Thoughts


Day 03 | Sunday June 9,2019

Days Progress

  • Completed the Data Type chapter in the FrontEnd Master's Python fundamentals.
  • This chapter introduces some nice concept about data types
    • 45j is a complex data type <class 'complex'> but not 45i, so j is the identifier for complex number.
    • new_name f"Hello, {name}" is a format string, name in {} is the variable name which will be replaced.
    • Same variable can be used to store number, or strings.
    • String can be created by both 'string 1 ' or " String 2 "
    • Integer division gives the result in floating point 3/2 = 1.5

Thoughts


Day 02 | Saturday June 8,2019

Days Progress

  • Understood the VSCode basic settings, got help from a great tutorial by Corey Schafer
  • The tutorials talks about these topics
    • Change the way settings is displayed as JSON, in place of UI.
    • Select virtual environment.
    • Change color theme.
    • Change file icons.
    • Set the global python path - "python.pythonPath": "<Path>"
    • Set a global python file formatter, we are using Black for this. "python.formatting.provider": "black",
      • Also change the option to run the formatter on saving the file. "editor.formatOnSave": true,
    • Enable Linting.
    • Git Integration.
    • Unit Testing.

Thoughts


Day 01 | Friday June 7,2019

Days Progress

  • Started the Python Fundamentals course by Nina Zakharenko.
  • Today's main focus was setting my these things.
    • Virtual environment.
    • VScode setup.
  • Faced few issues, which stackoverflow helped in solving

Issues and Solutions

  • There was no activate script when the virtual environment was created by using the command python -m venv .env
    • On doing Google for the problem found that running the same command again solves the issue, so ran python -m venv env again and viola the activate script appeared.
  • VScode was not recognizing the virtual environment created inside a sub folder in the project.
    • Deleted the pre-existing environment and created a new virtual environment at the project root.

Thoughts

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