Initial Commit

Author: AswinBarath

I Basics/1 First Python Program.py

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+print('Aswin Barath')
+name = input('What is your name?  Your Answer:')
+print(name)
+print('Helllloooo ' + name)

I Basics/10 Strings.py

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+# Strings
+print(type("Hi hello there"))
+print(type('Hey'))
+username = 'supercoder'
+password = 'supersecret'
+long_string = '''
+  M
+ WOW
+|O O|
+| | |
+|___|
+ \_/
+'''
+print(long_string)
+first_name = 'Aswin '
+last_name = 'Barath'
+full_name = first_name + last_name
+print(full_name)
+
+# String Concatenation
+print('Hello' + ' Aswin')
+
+# Type conversion
+print(type(int(str(100))))
+a = str(100)
+b = int(a)
+c = type(b)
+print(c)
+
+# Escape Sequence
+# Issue: weather = "It's "kind of" sunny"
+weather = "\t It\'s \"kind of\" sunny \n Hope you have a good day"
+print(weather)
+
+# Formatted Strings
+
+name = 'John Doe'
+age = 55
+print('hi ' + name + '. You are ' + str(age) + ' years old')
+
+# Python 3 Update:-
+print(f'hi {name}. You are {age} years old')
+
+# Python 2
+print('hi {}. You are {} years old'.format(name, age))
+print('hi {1}. You are {0} years old'.format(name, age))
+print('hi {new_name}. You are {new_age} years old'.format(new_name='Sally', new_age='19'))
+
+# String Indexes
+selfish = '01234567'
+# Index - 01234567
+print(selfish[6])
+
+# String Slicing - [start:stop:stepover]
+print(selfish[0:2])
+print(selfish[0:8])
+print(selfish[0:8:2])
+print(selfish[1:])
+print(selfish[:5])
+print(selfish[::1])
+print(selfish[-1])
+print(selfish[::-1])
+print(selfish[::-2])
+
+# Immutability
+# We cannot reassign a string

I Basics/11 Built-in Functions & Methods.py

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+# Built in Functions :-
+# str()
+# int()
+# float()
+# type()
+# print()
+greet = 'heeelllllooooo'
+print(greet[0:len(greet)])
+
+# Methods :-
+# .format()
+# .lower()
+quote = 'to be or not to be'
+
+print(quote.upper())
+print(quote.capitalize())
+print(quote.find('be'))
+print(quote.replace('be', 'me'))
+
+print(quote)
+
+quote2 = quote.replace('be', 'me')
+print(quote2)

I Basics/12 Booleans.py

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+# booleans :-
+# bool
+name = 'Aswin'
+is_cool = False
+
+is_cool = True
+
+print(bool(1))
+print(bool(0))
+print(bool('True'))
+print(bool('False'))

I Basics/13 Type Conversion.py

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+# Facebook :-
+name = 'Aswin'
+age = 19
+relationship_status = 'single'
+
+relationship_status = 'it\'s complicated'
+
+print(relationship_status)
+
+# Program that guesses your age
+birth_year = input('what year were you born:')
+age = 2020 - int(birth_year)
+print(f'Your age is:{age}')

I Basics/14 Ex - Password Checker.py

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+# To comment selected lines - command: ctrl + /
+
+user_name = input('Enter your username:')
+password = input('Enter your password:')
+password_length = len(password)
+secret = '*' * password_length
+
+print(f'Your password {secret} is {password_length} letters long')

I Basics/15 Lists.py

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+# Lists are like arrays
+li = [1, 2, 3, 4, 5]
+li2 = ['a', 'b', 'c']
+li3 = [1, 2, 'a', True]
+amazon_cart = ['notebooks', 'sunglasses']
+print(amazon_cart[0])
+print(amazon_cart[1])
+
+# List Slicing
+amazon_cart = [
+    'notebooks',
+    'sunglasses',
+    'toys',
+    'grapes'
+]
+print(amazon_cart[0:2])
+print(amazon_cart[0::2])
+# We Know Strings are Immutable
+# Lists are Mutable
+amazon_cart[0] = 'laptop'
+print(amazon_cart[0:3])
+print(amazon_cart)
+new_cart = amazon_cart[0:3]
+new_cart[0] = 'gum'
+print(new_cart)
+
+# new_cart simply points the same location
+new_cart = amazon_cart
+new_cart[0] = 'gum'
+print(amazon_cart)

I Basics/16 Matrix.py

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+# Matrix
+matrix = [
+    [1, 2, 3],
+    [2, 4, 6],
+    [7, 8, 9]
+]
+
+# Image of X stored as matrix :-
+matrix2 = [
+    [1, 0, 1],
+    [0, 1, 0],
+    [1, 0, 1]
+]
+
+print(matrix[0])
+print(matrix2[0])
+print(matrix[0][1])
+print(matrix2[0][1])

I Basics/17 List Methods.py

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+# Built in function
+basket = [1, 2, 3, 4, 5]
+print(len(basket))
+
+# List Methods
+# adding
+basket.append(100)
+new_list = basket
+print('append method')
+print(basket)
+print(new_list)
+
+basket.insert(4, 100)
+print('Insert method')
+print(basket)
+
+basket.extend([101])
+print('Extend method')
+print(basket)
+
+# removing
+basket.pop()
+basket.pop(4)
+popped = basket.pop(5)
+print('Pop methods')
+print(basket)
+print(popped)
+
+basket.remove(2)
+print('Remove method')
+print(basket)
+
+basket.clear()
+print('Clear method')
+print(basket)
+
+trolley = ['c', 'a', 'b', 'c', 'd', 'e', 'c']
+# Index ->  0   1   2   3   4
+print('Index method')
+print(trolley.index('d', 0, len(trolley)))
+print('d' in trolley)
+print('x' in trolley)
+print('w' in 'I\'m Aswin')
+
+print(trolley.count('c'))
+
+# Exercise
+# using this list,
+basket2 = ["Banana", "Apples", "Oranges", "Blueberries"]
+
+print(basket2)
+# 1. Remove the Banana from the list
+basket2.remove("Banana")
+print(basket2)
+# 2. Remove "Blueberries" from the list.
+basket2.pop()
+print(basket2)
+# 3. Put "Kiwi" at the end of the list.
+basket2.append('Kiwi')
+print(basket2)
+# 4. Add "Apples" at the beginning of the list
+basket2.insert(0, 'Apples')
+print(basket2)
+# 5. Count how many apples in the basket
+basket2.count('Apples')
+print(basket2)
+# 6. empty the basket
+basket2.clear()
+print(basket2)
+
+basket3 = ['e', 'd', 'c', 'x', 'd', 'b', 'a']
+basket3.sort()
+print('Sort method')
+print(basket3)
+# Built in function
+print(sorted(basket3))
+print(basket3)
+new_basket = basket.copy()
+new_basket.sort()
+print(new_basket)
+print(basket3)
+
+print(basket3)
+print('Reverse method')
+basket3.reverse()
+print(basket3)

I Basics/18 Common List Patterns.py

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+# Tricks in Lists
+basket = ['a', 'x', 'b', 'c', 'd', 'e', 'd']
+basket.sort()
+basket.reverse()
+print('Length of String')
+print(len(basket))
+print('Copy of Reverse using List Slicing')
+print(basket[::-1])
+print(basket)
+
+print('List using range')
+print(list(range(101)))
+
+# String method
+new_sentence = ' '.join(['hi', 'my', 'name', 'is', 'jojo'])
+print(new_sentence)
+
+# Exercise
+# fix this code so that it prints a sorted list of all of our friends (alphabetical). Scroll to see answer
+friends = ['Simon', 'Patty', 'Joy', 'Carrie', 'Amira', 'Chu', 'Stanley']
+
+friends.sort()
+print(friends)
+
+# Solution: (keep in mind there are multiple ways to do this, so your answer may vary.
+# As long as it works that's all that matters!)
+# friends.extend(new_friend)
+# print(sorted(friends))