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import math

math.atan(x)

#!/usr/bin/python3
import math

print("atan(0.64) : ", math.atan(0.64))
print("atan(0) : ", math.atan(0))
print("atan(10) : ", math.atan(10))
print("atan(-1) : ", math.atan(-1))
print("atan(1) : ", math.atan(1))

atan(0.64) :  0.5693131911006619
atan(0) :  0.0
atan(10) :  1.4711276743037347
atan(-1) :  -0.7853981633974483
atan(1) :  0.7853981633974483