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Author: vigneshkumar2016

loopingstatementspython.txt

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+vowels="AEIOU"
+for iter in vowels:
+    print("char:", iter)
+
+
+int_list = [1, 2, 3, 4, 5, 6]
+sum = 0
+for iter in int_list:
+    sum += iter
+print("Sum =", sum)
+print("Avg =", sum/len(int_list))
+
+
+for iter in range(0, 3):
+    print("iter: %d" % (iter))
+
+
+books = ['C', 'C++', 'Java', 'Python']
+for index in range(len(books)):
+   print('Book (%d):' % index, books[index])
+
+###FOR_ELSE
+birds = ['Belle', 'Coco', 'Juniper', 'Lilly', 'Snow']
+ignoreElse = False
+
+for theBird in birds:
+    print(theBird )
+    if ignoreElse and theBird is 'Snow':
+        break
+else:
+    print("No birds left.")
+
+
+##WHILE
+n = 5
+while n > 0:
+    n -=1
+    print(n)
+
+#WHILE BREAK
+n = 5
+while n > 0:
+    n -= 1
+    if n == 2:
+        break
+    print(n)
+print('Loop ended.')
+
+#WHILE CONTINUE
+n = 5
+while n > 0:
+    n -= 1
+    if n == 2:
+        continue
+    print(n)
+print('Loop ended.')
+
+#WHILE ELSE
+n = 5
+while n > 0:
+   n -= 1
+   print(n)
+   if n == 2:
+      break
+   else:
+      print('Loop done.')
+
+
+#ONELINE WHILE
+n =5
+while n > 0: n -= 1; print(n)
+
+
+#INTERACTIVE LOOPS
+#WHILE
+lines = list()
+testAnswer = input('Press y if you want to enter more lines: ')
+while testAnswer == 'y':
+    line = input('Next line: ')
+    lines.append(line)
+    testAnswer = input('Press y if you want to enter more lines: ')
+
+print('Your lines were:')
+for line in lines:
+    print(line)
+
+#FOR
+lines = list() 
+n = int(input('How many lines do you want to enter? ')) 
+for i in range(n): 
+    line = input('Next line: ') 
+    lines.append(line) 
+ 
+print('Your lines were:')  # check now 
+for line in lines: 
+    print(line) 

pythonclassdefinition.txt

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+#CLASSES
+#constructor declaration
+def __init__(self):
+    # body of the constructor
+
+#self constructors - definition & declaration
+class GeekforGeeks: 
+    geek = "" 
+  
+    # default constructor 
+    def __init__(self): 
+        self.geek = "GeekforGeeks"
+  
+    # a method for printing data members 
+    def print_Geek(self): 
+        print(self.geek) 
+  
+  
+# creating object of the class 
+obj = GeekforGeeks() 
+  
+# calling the instance method using the object obj 
+obj.print_Geek() 
+
+#Parameterized Constructors
+##PARAMETER PASSING
+lass Addition: 
+    first = 0
+    second = 0
+    answer = 0
+      
+    # parameterized constructor 
+    def __init__(self, f, s): 
+        self.first = f 
+        self.second = s 
+      
+    def display(self): 
+        print("First number = " + str(self.first)) 
+        print("Second number = " + str(self.second)) 
+        print("Addition of two numbers = " + str(self.answer)) 
+  
+    def calculate(self): 
+        self.answer = self.first + self.second 
+  
+# creating object of the class 
+# this will invoke parameterized constructor 
+obj = Addition(1000, 2000) 
+  
+# perform Addition 
+obj.calculate() 
+  
+# display result 
+obj.display() 
+
+#CLASS 
+class Shark:
+    def swim(self):
+        print("The shark is swimming.")
+
+    def be_awesome(self):
+        print("The shark is being awesome.")
+
+
+def main():
+    sammy = Shark()
+    sammy.swim()
+    sammy.be_awesome()
+
+if __name__ == "__main__":
+    main()
+
+
+#Definition1
+class Shark:
+    def __init__(self, name):
+        self.name = name
+
+    def swim(self):
+        # Reference the name
+        print(self.name + " is swimming.")
+
+    def be_awesome(self):
+        # Reference the name
+        print(self.name + " is being awesome.")
+
+
+
+#Definition2 - positional argument
+class Shark:
+    def __init__(self, name):
+        self.name = name
+
+    def swim(self):
+        print(self.name + " is swimming.")
+
+    def be_awesome(self):
+        print(self.name + " is being awesome.")
+
+
+def main():
+    # Set name of Shark object
+    sammy = Shark("Sammy")
+    sammy.swim()
+    sammy.be_awesome()
+
+if __name__ == "__main__":
+    main()
+
+#Definition3 - class instantiation
+class Shark:
+    def __init__(self, name):
+        self.name = name
+
+    def swim(self):
+        print(self.name + " is swimming.")
+
+    def be_awesome(self):
+        print(self.name + " is being awesome.")
+
+def main():
+    sammy = Shark("Sammy")
+    sammy.be_awesome()
+    stevie = Shark("Stevie")
+    stevie.swim()
+
+if __name__ == "__main__":
+  main()
+

pythonfunctiondefinition.txt

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+##FUNCTIONS
+
+def sumProblem(x, y):
+    sum = x + y
+    sentence = 'The sum of {} and {} is {}.'.format(x, y, sum)
+    print(sentence)
+
+def main():
+    sumProblem(2, 3)
+    sumProblem(1234567890123, 535790269358)
+    a = int(input("Enter an integer: "))
+    b = int(input("Enter another integer: "))
+    sumProblem(a, b)
+
+main() 
+
+#STRING FUNCTION
+def lastFirst(firstName, lastName):
+    separator = ', '
+    result = lastName + separator + firstName
+    return result
+
+print(lastFirst('Benjamin', 'Franklin'))
+print(lastFirst('Andrew', 'Harrington'))
+
+#SCOPE _ LOCAL
+def main():
+    x = 3
+    f()
+
+def f():
+    print(x)  # error: f does not know about the x defined in main
+
+main()
+
+#CORRECTING BAD SCOPE
+def main():
+    x = 3
+    f(x)
+
+def f(x):
+    print(x)  
+
+main()
+
+#GLOBAL CONSTANTS
+PI = 3.14159265358979   # global constant -- only place the value of PI is set
+
+def circleArea(radius):
+    return PI*radius*radius    # use value of global constant PI
+
+def circleCircumference(radius):
+    return 2*PI*radius         # use value of global constant PI
+
+def main():
+    print('circle area with radius 5:', circleArea(5))
+    print('circumference with radius 5:', circleCircumference(5))
+
+main()

pythonsetcommands.txt

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+thisset = {"apple", "banana", "cherry"}
+print(thisset)
+
+
+thisset = {"apple", "banana", "cherry"}
+
+for x in thisset:
+  print(x)
+
+
+thisset = {"apple", "banana", "cherry"}
+
+print("banana" in thisset)
+
+
+
+thisset = {"apple", "banana", "cherry"}
+
+thisset.add("orange")
+
+print(thisset)
+
+
+thisset = {"apple", "banana", "cherry"}
+
+thisset.update(["orange", "mango", "grapes"])
+
+print(thisset)
+
+
+thisset = {"apple", "banana", "cherry"}
+
+print(len(thisset))
+
+
+thisset = {"apple", "banana", "cherry"}
+
+thisset.remove("banana")
+
+print(thisset)
+
+
+thisset = {"apple", "banana", "cherry"}
+
+thisset.discard("banana")
+
+print(thisset)
+
+
+
+
+
+thisset = {"apple", "banana", "cherry"}
+
+x = thisset.pop()
+
+print(x)
+
+print(thisset)
+
+
+
+thisset = {"apple", "banana", "cherry"}
+
+thisset.clear()
+
+print(thisset)
+
+
+
+thisset = {"apple", "banana", "cherry"}
+
+del thisset
+
+print(thisset)
+
+
+
+thisset = set(("apple", "banana", "cherry")) # note the double round-brackets
+print(thisset)