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basic-programs/python/recursion/factorial.py at master · Hawkite/basic-programs · GitHub
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recursion
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factorial.py
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basic-programs
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python
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recursion
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factorial.py
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def
factorial
(
n
:
int
)
->
int
:
# Python >= 3.5
if
n
==
0
:
return
1
if
n
<
0
:
raise
ValueError
(
'Input needs to be a non-negative integer: '
+
str
(
n
))
return
n
*
factorial
(
n
-
1
)
if
__name__
==
"__main__"
:
# executes only upon import
try
:
print
(
"Factorial of 3 is: "
+
str
(
factorial
(
3
)))
print
(
"Factorial of 6 is: "
+
str
(
factorial
(
6
)))
print
(
"Factorial of -9 is: "
+
str
(
factorial
(
-
9
)))
except
Exception
as
ex
:
print
(
ex
)
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