Python Functionals 1-3

Author: harshildarji

Python Functionals/Map and Lambda Function.py

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+# Map and Lambda Function
+# https://www.hackerrank.com/challenges/map-and-lambda-expression/problem
+
+fib = lambda y: y if y < 2 else fib(y - 1) + fib(y - 2)
+print(list(map(lambda x: x**3, map(fib, range(int(input().strip()))))))

Python Functionals/Reduce Function.py

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+# Reduce Function
+# https://www.hackerrank.com/challenges/reduce-function/problem
+
+from fractions import Fraction
+from functools import reduce
+
+def product(fracs):
+    t = Fraction(reduce(lambda x,y : x*y,fracs))
+    return t.numerator, t.denominator
+
+if __name__ == '__main__':
+    fracs = []
+    for _ in range(int(input())): fracs.append(Fraction(*map(int, input().split())))
+    result = product(fracs)
+    print(*result)

Python Functionals/Validating Email Addresses With a Filter.py

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+# Validating Email Addresses With a Filter
+# https://www.hackerrank.com/challenges/validate-list-of-email-address-with-filter/problem
+
+import re
+
+addr = re.compile('''^[\w-]{1,}@[a-zA-Z0-9]{1,}\.\w{1,3}$''', re.UNICODE | re.VERBOSE)
+print(sorted(filter(addr.search, (input() for _ in range(int(input()))))))