python math.sqrt() method example

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import math

print( math.sqrt(  4   ) ) # 2
print( math.sqrt(  9   ) ) # 3

print( math.sqrt(  2   ) ) # 1.4142135623730951
print( math.sqrt(  0.5 ) ) # 0.7071067811865476
print( math.sqrt(  0   ) ) # 0
print( math.sqrt( -1   ) ) # ValueError