mirror of
https://github.com/TheAlgorithms/Python.git
synced 2024-10-06 05:39:30 +00:00
579937613a
* Added new tests! * [ADD]: Inproved Tests * fixed * Removed spaces * Changed the file name * Added Changes * changed the code and kept the test cases * changed the code and kept the test cases * missed the line * removed spaces * Update power_using_recursion.py * Added new tests in Signum * Few things added * Removed few stuff and added few changes * Fixed few things * Reverted the function * Update maths/signum.py Co-authored-by: Christian Clauss <cclauss@me.com> * Added few things * Update maths/signum.py Co-authored-by: Christian Clauss <cclauss@me.com> * Added the type hint back * Update signum.py --------- Co-authored-by: Christian Clauss <cclauss@me.com>
59 lines
1.2 KiB
Python
59 lines
1.2 KiB
Python
"""
|
|
Signum function -- https://en.wikipedia.org/wiki/Sign_function
|
|
"""
|
|
|
|
|
|
def signum(num: float) -> int:
|
|
"""
|
|
Applies signum function on the number
|
|
|
|
Custom test cases:
|
|
>>> signum(-10)
|
|
-1
|
|
>>> signum(10)
|
|
1
|
|
>>> signum(0)
|
|
0
|
|
>>> signum(-20.5)
|
|
-1
|
|
>>> signum(20.5)
|
|
1
|
|
>>> signum(-1e-6)
|
|
-1
|
|
>>> signum(1e-6)
|
|
1
|
|
>>> signum("Hello")
|
|
Traceback (most recent call last):
|
|
...
|
|
TypeError: '<' not supported between instances of 'str' and 'int'
|
|
>>> signum([])
|
|
Traceback (most recent call last):
|
|
...
|
|
TypeError: '<' not supported between instances of 'list' and 'int'
|
|
"""
|
|
if num < 0:
|
|
return -1
|
|
return 1 if num else 0
|
|
|
|
|
|
def test_signum() -> None:
|
|
"""
|
|
Tests the signum function
|
|
>>> test_signum()
|
|
"""
|
|
assert signum(5) == 1
|
|
assert signum(-5) == -1
|
|
assert signum(0) == 0
|
|
assert signum(10.5) == 1
|
|
assert signum(-10.5) == -1
|
|
assert signum(1e-6) == 1
|
|
assert signum(-1e-6) == -1
|
|
assert signum(123456789) == 1
|
|
assert signum(-123456789) == -1
|
|
|
|
|
|
if __name__ == "__main__":
|
|
print(signum(12))
|
|
print(signum(-12))
|
|
print(signum(0))
|