Question

How to write and use user-defined function in Python

Answer 1

def test(n):
    x = n * n
    return x

n = 5
print(test(n))

print(test(30))

y = test(10)
print(y)



'''
run:

25
900
100

'''

 

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Answer 2

def test():
    print("function test()")


test()


'''
run:

function test()

'''

 

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Answer 3

def test(n=3):
    x = n * n
    return x

n = 5
print(test(n))

print(test())



'''
run:

25
9

'''

 

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