IssamLL · May 8, 2022 13:02
diff --git a/__python_tricks__ b/__python_tricks__
 Python - Competitive Programming Tricks
diff --git a/collection.py b/collection.py
 # Initialising a list filled with value
 arr = [0]*10
 print(arr)

 x = 1
 arr = [x] * 10
 print(arr)

 # Reverse
 arr = [1, 2, 3, 4, 5]
 print(arr, '<>', arr[::-1])
 s = 'Hello world!'
 print(s, '<>', s[::-1])

 # Get dictionary
 dictionary = {'a': 1, 'b':2}
 print(dictionary['a'])

 try:
    print(dictionary['c'])
 except Exception as e:
    print('Error:', e)

 print(dictionary.get('c', 0)) # Default value is 0

 # For Else
 arr = []
 for x in arr:
    print(x)
 else:
    print('Empty array')

 # Copy
 arr = [1, 2, 3]
 print(arr)

 arr2 = arr.copy()
 arr[0] = 0

 print(arr)
 print(arr2)
diff --git a/in.py b/in.py
 # Read an integer from standard input:
 n = int(input())

 # Read an integer array from standard input:
 arr = list(map(int, input().split()))

 # Change input from standard input to file:
 import sys
 sys.stdin = open('in.txt', 'r')
diff --git a/operator.py b/operator.py
 # Floor div
 x = 6 // 4
 print(x)

 # Elvis
 x = 'true' if True else 'false'
 print(x)

 x = ('false', 'true')[2>1] # (falseValue, trueValue)[bool(<expression>)]
 print(x)

 # Swap
 a = 1
 b = 2
 print(a, b)
 a, b = b, a
 print(a, b)

 # Chained Comparison
 a = 100
 print(9>a<1001)
 print(9<a<1001)
 print(9<=a==100)
diff --git a/out.py b/out.py
 # Print variable to Standard output:
 x = 5
 print(x)
 print(x, end="") # Print without break line

 print() # Print break line

 s = "Hello world"
 print(s)

 print(s, x)

 arr = [1, 2, 3]
 print(arr)
 print(*arr)

 dictionary = {'x': 1, 'y': 2, 'z': 3}
 print(dictionary)
 print(*dictionary)

 # Change output from standard output to file:
 import sys
 sys.stdout = open('out.txt', 'w')
diff --git a/strings.py b/strings.py
 # String Interpolation
 result = 100

 s = 'result is {}'.format(result)
 print(s)

 s = f'result is {result}' # From Python 3.6
 print(s)

 s = 'result is %s' % (result)
 print(s)

 # String join
 arr = [1, 2, 3]
 s = ''.join(map(str, arr)) # Convert list integer to string
 print(s)
 s = '\n'.join(map(str, arr))
 print(s)

 # String to array of character
 s = 'abcdef'
 arr = list(s)
 print(arr)

 # String split
 s = '1 2 3'
 arr = list(map(int, s.split())) # Default split parameter is space
 print(arr)
diff --git a/The elapsed time during the whole program in seconds b/The elapsed time during the whole program in seconds
 from time import perf_counter
    
 # Start the stopwatch / counter
 t1_start = perf_counter()

 # Your code

 # Stop the stopwatch / counter
 t1_stop = perf_counter()
 
 print("Elapsed time during the whole program in seconds:", t1_stop-t1_start)
diff --git a/unittest_run.py b/unittest_run.py
 # To run all tests: python3 unittest_run.py
 # To run single test: python3 unittest_run.py {test_function_name}, ex: python3 unittest_run.py testInOut

 import sys
 import os

 if __name__ == '__main__':
    args = " ".join(map(lambda x: f'Test.{x}', sys.argv[1:]))
    cmd = f'python3 -m unittest -v unittest_test.py {args}'
    os.system(cmd)
diff --git a/unittest_solution.py b/unittest_solution.py
 # This program read two integer from Standard Input and print sum

 def compute(a, b):
    return a+b

 def main():
    a, b = map(int, input().split())
    result = compute(a, b)
    print(result)

 if __name__ == '__main__':
    main()
diff --git a/unittest_test.py b/unittest_test.py
 # This program test unittest_solution.py

 import sys
 sys.dont_write_bytecode = True

 import unittest
 import unittest_solution as solution

 class Test(unittest.TestCase):
    def tearDown(self):
        try:
            import os
            os.remove('in.txt')
            os.remove('out.txt')
            os.remove('result.txt')
        except:
            pass

    # Test direct sample
    def testSample(self):
        self.assertEqual(solution.compute(1, 2), 3)
        self.assertEqual(solution.compute(2, 2), 4)
        self.assertEqual(solution.compute(1, 1), 2)

    # Test input, output
    def testInOut(self):
        with open('in.txt', 'w') as fi:
            print('1 2', file=fi)
        with open('out.txt', 'w') as fo:
            print('3', file=fo)

        sys.stdin = open('in.txt', 'r')
        sys.stdout = open('result.txt', 'w')
        solution.main()

        sys.stdin.close()
        sys.stdout.close()

        import filecmp
        self.assertTrue(filecmp.cmp('result.txt', 'out.txt'))


 if __name__ == '__main__':
    unittest.main()
diff --git a/utility.py b/utility.py
 # Print 2d array pretty
 def printPretty2dArray(arr):
    print('\n'.join(['\t'.join([str(cell) for cell in row]) for row in arr]))

 matrix = [[1, 2, 3], [4, 5, 6]]
 print(matrix)
 printPretty2dArray(matrix)
	# Initialising a list filled with value
	arr = [0]*10
	print(arr)

	x = 1
	arr = [x] * 10
	print(arr)

	# Reverse
	arr = [1, 2, 3, 4, 5]
	print(arr, '<>', arr[::-1])
	s = 'Hello world!'
	print(s, '<>', s[::-1])

	# Get dictionary
	dictionary = {'a': 1, 'b':2}
	print(dictionary['a'])

	try:
	print(dictionary['c'])
	except Exception as e:
	print('Error:', e)

	print(dictionary.get('c', 0)) # Default value is 0

	# For Else
	arr = []
	for x in arr:
	print(x)
	else:
	print('Empty array')

	# Copy
	arr = [1, 2, 3]
	print(arr)

	arr2 = arr.copy()
	arr[0] = 0

	print(arr)
	print(arr2)
	# Read an integer from standard input:
	n = int(input())

	# Read an integer array from standard input:
	arr = list(map(int, input().split()))

	# Change input from standard input to file:
	import sys
	sys.stdin = open('in.txt', 'r')
	# Floor div
	x = 6 // 4
	print(x)

	# Elvis
	x = 'true' if True else 'false'
	print(x)

	x = ('false', 'true')[2>1] # (falseValue, trueValue)[bool(<expression>)]
	print(x)

	# Swap
	a = 1
	b = 2
	print(a, b)
	a, b = b, a
	print(a, b)

	# Chained Comparison
	a = 100
	print(9>a<1001)
	print(9<a<1001)
	print(9<=a==100)
	# Print variable to Standard output:
	x = 5
	print(x)
	print(x, end="") # Print without break line

	print() # Print break line

	s = "Hello world"
	print(s)

	print(s, x)

	arr = [1, 2, 3]
	print(arr)
	print(*arr)

	dictionary = {'x': 1, 'y': 2, 'z': 3}
	print(dictionary)
	print(*dictionary)

	# Change output from standard output to file:
	import sys
	sys.stdout = open('out.txt', 'w')
	# String Interpolation
	result = 100

	s = 'result is {}'.format(result)
	print(s)

	s = f'result is {result}' # From Python 3.6
	print(s)

	s = 'result is %s' % (result)
	print(s)

	# String join
	arr = [1, 2, 3]
	s = ''.join(map(str, arr)) # Convert list integer to string
	print(s)
	s = '\n'.join(map(str, arr))
	print(s)

	# String to array of character
	s = 'abcdef'
	arr = list(s)
	print(arr)

	# String split
	s = '1 2 3'
	arr = list(map(int, s.split())) # Default split parameter is space
	print(arr)
	from time import perf_counter

	# Start the stopwatch / counter
	t1_start = perf_counter()

	# Your code

	# Stop the stopwatch / counter
	t1_stop = perf_counter()

	print("Elapsed time during the whole program in seconds:", t1_stop-t1_start)
	# To run all tests: python3 unittest_run.py
	# To run single test: python3 unittest_run.py {test_function_name}, ex: python3 unittest_run.py testInOut

	import sys
	import os

	if __name__ == '__main__':
	args = " ".join(map(lambda x: f'Test.{x}', sys.argv[1:]))
	cmd = f'python3 -m unittest -v unittest_test.py {args}'
	os.system(cmd)
	# This program read two integer from Standard Input and print sum

	def compute(a, b):
	return a+b

	def main():
	a, b = map(int, input().split())
	result = compute(a, b)
	print(result)

	if __name__ == '__main__':
	main()
	# This program test unittest_solution.py

	import sys
	sys.dont_write_bytecode = True

	import unittest
	import unittest_solution as solution

	class Test(unittest.TestCase):
	def tearDown(self):
	try:
	import os
	os.remove('in.txt')
	os.remove('out.txt')
	os.remove('result.txt')
	except:
	pass

	# Test direct sample
	def testSample(self):
	self.assertEqual(solution.compute(1, 2), 3)
	self.assertEqual(solution.compute(2, 2), 4)
	self.assertEqual(solution.compute(1, 1), 2)

	# Test input, output
	def testInOut(self):
	with open('in.txt', 'w') as fi:
	print('1 2', file=fi)
	with open('out.txt', 'w') as fo:
	print('3', file=fo)

	sys.stdin = open('in.txt', 'r')
	sys.stdout = open('result.txt', 'w')
	solution.main()

	sys.stdin.close()
	sys.stdout.close()

	import filecmp
	self.assertTrue(filecmp.cmp('result.txt', 'out.txt'))


	if __name__ == '__main__':
	unittest.main()
	# Print 2d array pretty
	def printPretty2dArray(arr):
	print('\n'.join(['\t'.join([str(cell) for cell in row]) for row in arr]))

	matrix = [[1, 2, 3], [4, 5, 6]]
	print(matrix)
	printPretty2dArray(matrix)