The math.erfc() is stands for “error function complement” and returns the complementary error function at the given real argument.

Syntax:
math.erfc(x)
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Where, parameter is a real number.  If x is not a real number, a TypeError is raised.

The function returns  a floating point value  which is the value of the error function at x

ExampleEdit & Run
import math

print(math.erf(0.01))
print(math.erf(0.5))
print(math.erf(2))
print(math.erf(3.142))
print(math.erf(math.e))
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Output:
0.011283415555849616 0.5204998778130465 0.9953222650189527 0.9999911475973404 0.9998790689599072 [Finished in 0.011116503737866879s]