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Difference between positional arguments and keyword arguments.
If you consider the below example.
def fn (a, b, c = 1): # a/b required, c optional. return a * b + c
Now, the above function can be called in the below ways.
print fn (1, 2) # returns 3,
here arguments(1,2) are positional and we did not give the third argument, so it is defaulted to value 1. print fn (1, 2, 3) # returns 5, here the arguments(1,2,3) are positional.
print fn (c = 5, b = 2, a = 2) # returns 9,
here the arguments(c = 5, b = 2, a = 2) are keyword arguments or named arguments.
print fn (b = 2, a = 2) # returns 5,
here the arguments(b = 2, a = 2) are keyword or named arugments and c is defaulted to value 1 .
print fn (5, c = 2, b = 1) # returns 7,
here 5 is positional argument and c = 2, b = 1 are named or keyword arguments.
print fn (8, b = 0) # returns 1,
here 8 is positional, b=0 is named and c is defaulted to value 1.
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