diff options
Diffstat (limited to 'Misc/python.man')
| -rw-r--r-- | Misc/python.man | 40 |
1 files changed, 6 insertions, 34 deletions
diff --git a/Misc/python.man b/Misc/python.man index 20beded362..757d4d8949 100644 --- a/Misc/python.man +++ b/Misc/python.man @@ -37,13 +37,6 @@ python \- an interpreted, interactive, object-oriented programming language .B \-OO ] [ -.B \-R -] -[ -.B -Q -.I argument -] -[ .B \-s ] [ @@ -155,27 +148,6 @@ Discard docstrings in addition to the \fB-O\fP optimizations. Do not print the version and copyright messages. These messages are also suppressed in non-interactive mode. .TP -.B \-R -Turn on "hash randomization", so that the hash() values of str, bytes and -datetime objects are "salted" with an unpredictable pseudo-random value. -Although they remain constant within an individual Python process, they are -not predictable between repeated invocations of Python. -.IP -This is intended to provide protection against a denial of service -caused by carefully-chosen inputs that exploit the worst case performance -of a dict construction, O(n^2) complexity. See -http://www.ocert.org/advisories/ocert-2011-003.html -for details. -.TP -.BI "\-Q " argument -Division control; see PEP 238. The argument must be one of "old" (the -default, int/int and long/long return an int or long), "new" (new -division semantics, i.e. int/int and long/long returns a float), -"warn" (old division semantics with a warning for int/int and -long/long), or "warnall" (old division semantics with a warning for -all use of the division operator). For a use of "warnall", see the -Tools/scripts/fixdiv.py script. -.TP .B \-s Don't add user site directory to sys.path. .TP @@ -184,7 +156,9 @@ Disable the import of the module .I site and the site-dependent manipulations of .I sys.path -that it entails. +that it entails. Also disable these manipulations if +.I site +is explicitly imported later. .TP .B \-u Force the binary I/O layers of stdin, stdout and stderr to be unbuffered. @@ -429,9 +403,8 @@ specifying \fB\-v\fP multiple times. If this is set to a comma-separated string it is equivalent to specifying the \fB\-W\fP option for each separate value. .IP PYTHONHASHSEED -If this variable is set to "random", the effect is the same as specifying -the \fB-R\fP option: a random value is used to seed the hashes of str, -bytes and datetime objects. +If this variable is set to "random", a random value is used to seed the hashes +of str, bytes and datetime objects. If PYTHONHASHSEED is set to an integer value, it is used as a fixed seed for generating the hash() of the types covered by the hash randomization. Its @@ -440,8 +413,7 @@ interpreter itself, or to allow a cluster of python processes to share hash values. The integer must be a decimal number in the range [0,4294967295]. Specifying -the value 0 will lead to the same hash values as when hash randomization is -disabled. +the value 0 will disable hash randomization. .SH AUTHOR The Python Software Foundation: http://www.python.org/psf .SH INTERNET RESOURCES |