diff options
| -rwxr-xr-x | Demo/scripts/fact.py | 36 |
1 files changed, 19 insertions, 17 deletions
diff --git a/Demo/scripts/fact.py b/Demo/scripts/fact.py index c030187..8ee2588 100755 --- a/Demo/scripts/fact.py +++ b/Demo/scripts/fact.py @@ -9,39 +9,41 @@ import sys from math import sqrt def fact(n): - if n < 1: raise ValueError # fact() argument should be >= 1 - if n == 1: return [] # special case + if n < 1: + raise ValueError('fact() argument should be >= 1') + if n == 1: + return [] # special case res = [] - # Treat even factors special, so we can use i = i+2 later - while n%2 == 0: + # Treat even factors special, so we can use i += 2 later + while n % 2 == 0: res.append(2) - n = n//2 + n //= 2 # Try odd numbers up to sqrt(n) - limit = sqrt(float(n+1)) + limit = sqrt(n+1) i = 3 while i <= limit: - if n%i == 0: + if n % i == 0: res.append(i) - n = n//i + n //= i limit = sqrt(n+1) else: - i = i+2 + i += 2 if n != 1: res.append(n) return res def main(): if len(sys.argv) > 1: - for arg in sys.argv[1:]: - n = eval(arg) - print n, fact(n) + source = sys.argv[1:] else: + source = iter(raw_input, '') + for arg in source: try: - while 1: - n = input() - print n, fact(n) - except EOFError: - pass + n = int(arg) + except ValueError: + print arg, 'is not an integer' + else: + print n, fact(n) if __name__ == "__main__": main() |