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Diffstat (limited to 'Doc/library/random.rst')
| -rw-r--r-- | Doc/library/random.rst | 9 |
1 files changed, 9 insertions, 0 deletions
diff --git a/Doc/library/random.rst b/Doc/library/random.rst index 1cd4d26882..11dd367f8a 100644 --- a/Doc/library/random.rst +++ b/Doc/library/random.rst @@ -43,6 +43,12 @@ The :mod:`random` module also provides the :class:`SystemRandom` class which uses the system function :func:`os.urandom` to generate random numbers from sources provided by the operating system. +.. warning:: + + The pseudo-random generators of this module should not be used for + security purposes. Use :func:`os.urandom` or :class:`SystemRandom` if + you require a cryptographically secure pseudo-random number generator. + Bookkeeping functions: @@ -145,6 +151,9 @@ Functions for sequences: argument. This is especially fast and space efficient for sampling from a large population: ``sample(range(10000000), 60)``. + If the sample size is larger than the population size, a :exc:`ValueError` + is raised. + The following functions generate specific real-valued distributions. Function parameters are named after the corresponding variables in the distribution's equation, as used in common mathematical practice; most of these equations can |