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Python  abs() method example
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The abs()
function returns the absolute value of a number.
The absolute value of the number x denoted x, is the nonnegative value of x without regard to its sign.
Popular usage examples:
print(abs(2)) # 2
print(abs(2)) # 2
print(abs(2.54)) # 2.54
print(abs(2.54)) # 2.54
print(abs(0)) # 0
print(abs(3 + 5)) # 8
print(abs(3  5)) # 2
1. Documentation
Syntax 

Parameters  number  number whose absolute value is to be returned 
Result  The absolute value calculated from the number . 
Description 

2. abs()
custom implementation
def absoluteValue(x):
if x < 0:
return x
return x
print(absoluteValue(2)) # 2
print(absoluteValue(2)) # 2
print(absoluteValue(0)) # 0