added python3 code for introduction subdomain

Author: arsho

Introduction/ArithmeticOperators.py

@@ -3,12 +3,12 @@
 Subdomain : Introduction
 Domain    : Python
 Author    : Ahmedur Rahman Shovon
-Created   : 15 July 2016
+Created   : 15 April 2020
 Problem   : https://www.hackerrank.com/challenges/python-arithmetic-operators/problem
 '''
-# Enter your code here. Read input from STDIN. Print output to STDOUT
-a=int(raw_input())
-b=int(raw_input())
-print a+b
-print a-b
-print a*b
+if __name__ == '__main__':
+    a = int(input())
+    b = int(input())
+    print(a+b)
+    print(a-b)
+    print(a*b)

Introduction/Loops.py

@@ -3,10 +3,11 @@
 Subdomain : Introduction
 Domain    : Python
 Author    : Ahmedur Rahman Shovon
-Created   : 15 July 2016
+Created   : 13 May 2020
 Problem   : https://www.hackerrank.com/challenges/python-loops/problem
 '''
-# Enter your code here. Read input from STDIN. Print output to STDOUT
-a=int(raw_input())
-for i in range(0,a):
-    print i*i
+if __name__ == '__main__':
+    n = int(input())
+    for i in range(n):
+        print(i*i)
+

Introduction/PrintFunction.py

@@ -3,10 +3,21 @@
 Subdomain : Introduction
 Domain    : Python
 Author    : Ahmedur Rahman Shovon
-Created   : 15 July 2016
+Created   : 06 July 2020
 Problem   : https://www.hackerrank.com/challenges/python-print/problem
 '''
-n=int(input())
-ar=range(1,n+1)
-for i in ar:
-    print(i,end="")
+
+if __name__ == '__main__':
+    n = int(input())
+    ar=range(1,n+1)
+    for i in ar:
+        print(i,end="")
+
+"""
+Alternate solution:
+
+if __name__ == '__main__':
+    n = int(input())
+    print("".join([str(i) for i in range(1,n+1)]))
+
+"""

Introduction/PythonDivision.py

@@ -3,12 +3,12 @@
 Subdomain : Introduction
 Domain    : Python
 Author    : Ahmedur Rahman Shovon
-Created   : 15 July 2016
+Created   : 06 July 2020
 Problem   : https://www.hackerrank.com/challenges/python-division/problem
 '''
-# Enter your code here. Read input from STDIN. Print output to STDOUT
-a=int(raw_input())
-b=int(raw_input())
-print a/b
-c=float(a)
-print c/b
+if __name__ == '__main__':
+    a = int(input())
+    b = int(input())
+    print(a//b)
+    print(a/b)
+    

Introduction/ReadingRawInput.py

@@ -3,13 +3,13 @@
 Subdomain : Introduction
 Domain    : Python
 Author    : Ahmedur Rahman Shovon
-Created   : 15 July 2016
+Created   : 06 July 2020
 Problem   : https://www.hackerrank.com/challenges/write-a-function/problem
 '''
 def is_leap(year):
-    leap = False
-    if (year % 400 == 0):
-        leap = True
-    elif year % 4 == 0 and year % 100 !=0:
-        leap = True    
+    leap = False    
+    leap = (year%400==0) or (year%4==0 and year%100!=0)    
     return leap
+
+year = int(input())
+print(is_leap(year))

Introduction/Writeafunction.py

@@ -19,7 +19,6 @@ My solutions of <strong>Hackerrank Python Domain</strong> challenges. The codes
 
 - Introduction
    - [Say Hello, World! With Python](Introduction/SayHelloWorldWithPython.py)
-   - [Reading Raw Input](Introduction/ReadingRawInput.py)
    - [Python If-Else](Introduction/PythonIfElse.py)
    - [Arithmetic Operators](Introduction/ArithmeticOperators.py)
    - [Python: Division](Introduction/PythonDivision.py)