On Tue, Dec 06, 2022 at 07:58:09PM -0500, David Mertz, Ph.D. wrote:
> You have an error in the code you posted. You never use R2 after one
> call to SystemRandom.
Ah so I do, thanks for picking that up!
James, see how *easy* it is for experts to notice bugs, at least some of
them, in a short piece of code that gets right to the point? The more
extraneous and irrelevant code you give, and that includes old dead
comments, the more places for bugs to hide and the harder it is for
people reading to follow the code and spot the error.
Here is the corrected code (only one line needs to be fixed) and its
output. Note that the conclusion doesn't change.
```python
import random
from statistics import mean, stdev
R2 = random.SystemRandom()
d2 = [R2.randint(1, 9) for i in range(100000)]
triples = 0 # Count the number of triples.
for i in range(len(d2)-3):
a, b, c = d2[i:i+3]
if a == b == c: triples += 1
print("mean =", mean(d2))
print("stdev =", stdev(d2))
print("runs of three:", triples)
```
And the output:
```
mean = 4.9922
stdev = 2.5837929328526306
runs of three: 1204
```
--
Steve
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