[PYTH-002] Add Python list operations and foundational programs

.gitignore

@@ -21,3 +21,4 @@
 npm-debug.log*
 yarn-debug.log*
 yarn-error.log*
+.appmodconfig

python/P01_hello.py

@@ -0,0 +1,9 @@
+# Author: OMKAR PATHAK
+# This program prints the entered message
+
+def justPrint(text):
+    '''This function prints the text passed as argument to this function'''
+    print(text)
+
+if __name__ == '__main__':
+    justPrint('Hello01 appmod')

python/P02_InstanceMethods.py

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+#Author: OMKAR PATHAK
+#In this example we will be seeing how instance methods are used
+#Instance methods are accessed by: instance.method()
+
+class Vehicle():
+    #Class Methods/ Attributes
+
+    #Here self is passed as an argument because instance is passed as first argument
+    def type(self):     #Without self it throws an error
+        print(self)
+        print('I have a type')
+
+car = Vehicle()
+print(car)
+car.type()

python/P02_VariableScope copy.py

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+#Author: OMKAR PATHAK
+#This programs shows the rules for variable scope
+
+# LEGB Rule: Local, Enclosing, Global, Built-in
+
+x = 80  # Global x
+
+def test():
+    #global x
+    y = 100  # Local y
+    x = 20
+    print(x + y) #prints 'Local x' and  'Local y'
+
+if __name__ == '__main__':
+    test()
+    print(x) #prints 'Global x'

python/P02_VariableScope.py

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+#Author: OMKAR PATHAK
+#This programs shows the rules for variable scope
+
+# LEGB Rule: Local, Enclosing, Global, Built-in
+
+x = 'Global x'
+
+def test():
+    #global x
+    y = 'Local y'
+    x = 'Local x'
+    print(x +', '+ y) #prints 'Local x' and  'Local y'
+
+if __name__ == '__main__':
+    test()
+    print(x) #prints 'Global x'

python/P03_ListsOperations.py

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+#Author: OMKAR PATHAK
+#This program gives examples about various list operations
+
+#Syntax: list[start: end: step]
+
+myList = [1, 2, 3, 4, 5, 6, 7, 8, 9]
+#index    0  1  2  3  4  5  6  7  8
+#        -9 -8 -7 -6 -5 -4 -3 -2 -1
+
+#List Slicing
+print('Original List:',myList)
+print('First Element:',myList[0]) #Prints the first element of the list or 0th element of the list
+print('Element at 2nd Index position:',myList[2]) #Prints the 2nd element of the list
+print('Elements from 0th Index to 4th Index:',myList[0: 5]) #Prints elements of the list from 0th index to 4th index. IT DOESN'T INCLUDE THE LAST INDEX
+print('Element at -7th Index:',myList[-7]) #Prints the -7th or 3rd element of the list
+
+#To append an element to a list
+myList.append(10)
+print('Append:',myList)
+
+#To find the index of a particular element
+print('Index of element \'6\':',myList.index(6)) #returns index of element '6'
+
+#To sort the list
+myList.sort()
+
+#To pop last element
+print('Poped Element:',myList.pop())
+
+#To remove a particular element from the lsit BY NAME
+myList.remove(6)
+print('After removing \'6\':',myList)
+
+#To insert an element at a specified Index
+myList.insert(5, 6)
+print('Inserting \'6\' at 5th index:',myList)
+
+#To count number of occurences of a element in the list
+print('No of Occurences of \'1\':',myList.count(1))
+
+#To extend a list that is insert multiple elemets at once at the end of the list
+myList.extend([11,0])
+print('Extending list:',myList)
+
+#To reverse a list
+myList.reverse()
+print('Reversed list:',myList)

python/P04_Factorial copy.py

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+#Author: OMKAR PATHAK
+#This program finds the favtorial of the specified numbers
+#For example, factorial of 5 = 5*4*3*2*1 = 120
+
+def factorial(number):
+    '''This function finds the factorial of the number passed as argument'''
+    if number < 0:
+        print('Invalid entry! Cannot find factorial of a negative number')
+    if number == 0 or number == 1:
+        return 1
+    else:
+        return number * factorial(number - 1)
+
+if __name__ == '__main__':
+    userInput = int(input('Enter the Number to find the factorial of: '))
+    print(factorial(userInput))

python/P04_Factorial.py

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+#Author: OMKAR PATHAK
+#This program finds the favtorial of the specified numbers
+#For example, factorial of 5 = 5*4*3*2*1 = 120
+
+def factorial(number):
+    '''This function finds the factorial of the number passed as argument'''
+    if number < 0:
+        print('Invalid entry! Cannot find factorial of a negative number')
+    if number == 0 or number == 1:
+        return 1
+    else:
+        return number * factorial(number - 1)
+
+if __name__ == '__main__':
+    userInput = int(input('Enter the Number to find the factorial of: '))
+    print(factorial(userInput))

python/P05_Pattern copy.py

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+#Author: OMKAR PATHAK
+#This program prints various patterns
+
+def pattern1(level):
+    '''This function prints the following pattern:
+
+    *
+    **
+    ***
+    ****
+
+    '''
+    for i in range(1, level + 1):
+        print()
+        for j in range(i):
+            print('*', end = '')
+
+def pattern2(level):
+    '''This function prints the following pattern:
+
+    ****
+    ***
+    **
+    *
+
+    '''
+    for i in range(level, 0, -1):
+        print()
+        for j in range(i):
+            print('*', end = '')
+
+def pattern3(level):
+    '''This function prints the following pattern:
+
+       *
+      **
+     ***
+    ****
+
+    '''
+    counter = level
+    for i in range(level + 1):
+        print(' ' * counter + '*' * i)
+        counter -= 1
+
+def pattern4(level):
+    '''This function prints the following pattern:
+
+    ****
+     ***
+      **
+       *
+
+    '''
+    counter = 0
+    for i in range(level, 0 ,-1):
+        print(' ' * counter + '*' * i)
+        counter += 1
+
+def pattern5(level):
+    '''This function prints the following pattern:
+
+      *
+     ***
+    *****
+
+    '''
+    # first loop for number of lines
+    for i in range(level + 1):
+        #second loop for spaces
+        for j in range(level - i):
+            print (" ",end='')
+        # this loop is for printing stars
+        for k in range(2 * i - 1):
+            print("*", end='')
+        print()
+
+
+if __name__ == '__main__':
+    userInput = int(input('Enter the level: '))
+    pattern1(userInput)
+    print()
+    pattern2(userInput)
+    print()
+    pattern3(userInput)
+    print()
+    pattern4(userInput)
+    print()
+    pattern5(userInput)
+    print()
+
+    def pattern6(userInput):
+        '''
+        following is the another approach to solve pattern problems with reduced time complexity 
+
+        for 
+
+        *
+        **
+        ***
+        ****
+        *****
+        '''
+
+        num = int(input('Enter number for pattern'))
+        pattern = '*'
+        string = pattern * num
+        x = 0
+
+        for i in string:
+            x = x + 1
+            print(string[0:x])

python/P05_Pattern.py

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+#Author: OMKAR PATHAK
+#This program prints various patterns
+
+def pattern1(level):
+    '''This function prints the following pattern:
+
+    *
+    **
+    ***
+    ****
+
+    '''
+    for i in range(1, level + 1):
+        print()
+        for j in range(i):
+            print('*', end = '')
+
+def pattern2(level):
+    '''This function prints the following pattern:
+
+    ****
+    ***
+    **
+    *
+
+    '''
+    for i in range(level, 0, -1):
+        print()
+        for j in range(i):
+            print('*', end = '')
+
+def pattern3(level):
+    '''This function prints the following pattern:
+
+       *
+      **
+     ***
+    ****
+
+    '''
+    counter = level
+    for i in range(level + 1):
+        print(' ' * counter + '*' * i)
+        counter -= 1
+
+def pattern4(level):
+    '''This function prints the following pattern:
+
+    ****
+     ***
+      **
+       *
+
+    '''
+    counter = 0
+    for i in range(level, 0 ,-1):
+        print(' ' * counter + '*' * i)
+        counter += 1
+
+def pattern5(level):
+    '''This function prints the following pattern:
+
+      *
+     ***
+    *****
+
+    '''
+    # first loop for number of lines
+    for i in range(level + 1):
+        #second loop for spaces
+        for j in range(level - i):
+            print (" ",end='')
+        # this loop is for printing stars
+        for k in range(2 * i - 1):
+            print("*", end='')
+        print()
+
+
+if __name__ == '__main__':
+    userInput = int(input('Enter the level: '))
+    pattern1(userInput)
+    print()
+    pattern2(userInput)
+    print()
+    pattern3(userInput)
+    print()
+    pattern4(userInput)
+    print()
+    pattern5(userInput)
+    print()
+
+    def pattern6(userInput):
+        '''
+        following is the another approach to solve pattern problems with reduced time complexity 
+
+        for 
+
+        *
+        **
+        ***
+        ****
+        *****
+        '''
+
+        num = int(input('Enter number for pattern'))
+        pattern = '*'
+        string = pattern * num
+        x = 0
+
+        for i in string:
+            x = x + 1
+            print(string[0:x])

python/P06_CharCount.py

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+#Author: OMKAR PATHAK
+#This program checks for the character frequency in the given string
+
+def charFrequency(userInput):
+    '''This fuction helps to count the char frequency in the given string '''
+    userInput = userInput.lower() #covert to lowercase
+    dict = {}
+    for char in userInput:
+     if char in dict:
+        if char in keys:
+            dict[char] += 1
+        else:
+            dict[char] = 1
+    return dict
+
+if __name__ == '__main__':
+    userInput = str(input('Enter a string: '))
+    print(charFrequency(userInput))