adii1823
26 lines
748 B
Python
26 lines
748 B
Python
# exceptions/trace.back.py
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def squareroot(number):
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if number < 0:
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raise ValueError("No negative numbers please")
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return number ** .5
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def quadratic(a, b, c):
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d = b ** 2 - 4 * a * c
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return ((-b - squareroot(d)) / (2 * a),
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(-b + squareroot(d)) / (2 * a))
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quadratic(1, 0, 1) # x**2 + 1 == 0
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"""
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$ python exceptions/trace.back.py
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Traceback (most recent call last):
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File "exceptions/trace.back.py", line 12, in <module>
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quadratic(1, 0, 1) # x**2 + 1 == 0
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File "exceptions/trace.back.py", line 9, in quadratic
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return ((-b - squareroot(d)) / (2 * a),
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File "exceptions/trace.back.py", line 4, in squareroot
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raise ValueError("No negative numbers please")
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ValueError: No negative numbers please
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"""
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