-B Don't write .py[co] files on import. See also PYTHONDONTWRITEBYTECODE.
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-c command
Specify the command to execute (see next section). This terminates the option list (following
options are passed as arguments to the command).
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-d Turn on parser debugging output (for wizards only, depending on compilation options).
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-E Ignore environment variables like PYTHONPATH and PYTHONHOME that modify the behavior of the
interpreter.
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-h , -? , --help
Prints the usage for the interpreter executable and exits.
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-i When a script is passed as first argument or the -c option is used, enter interactive mode after
executing the script or the command. It does not read the $PYTHONSTARTUP file. This can be
useful to inspect global variables or a stack trace when a script raises an exception.
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-m module-name
Searches sys.path for the named module and runs the corresponding .py file as a script.
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-O Turn on basic optimizations. This changes the filename extension for compiled (bytecode) files
from .pyc to .pyo. Given twice, causes docstrings to be discarded.
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-OO Discard docstrings in addition to the -O optimizations.
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-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.
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.
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-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.
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-s Don't add user site directory to sys.path.
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-S Disable the import of the module site and the site-dependent manipulations of sys.path that it
entails.
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-t Issue a warning when a source file mixes tabs and spaces for indentation in a way that makes it
depend on the worth of a tab expressed in spaces. Issue an error when the option is given twice.
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-u Force stdin, stdout and stderr to be totally unbuffered. On systems where it matters, also put
stdin, stdout and stderr in binary mode. Note that there is internal buffering in xreadlines(),
readlines() and file-object iterators ("for line in sys.stdin") which is not influenced by this
option. To work around this, you will want to use "sys.stdin.readline()" inside a "while 1:"
loop.
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-v Print a message each time a module is initialized, showing the place (filename or built-in module)
from which it is loaded. When given twice, print a message for each file that is checked for when
searching for a module. Also provides information on module cleanup at exit.
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-V , --version
Prints the Python version number of the executable and exits.
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-W argument
Warning control. Python sometimes prints warning message to sys.stderr. A typical warning
message has the following form: file:line: category: message. By default, each warning is printed
once for each source line where it occurs. This option controls how often warnings are printed.
Multiple -W options may be given; when a warning matches more than one option, the action for the
last matching option is performed. Invalid -W options are ignored (a warning message is printed
about invalid options when the first warning is issued). Warnings can also be controlled from
within a Python program using the warnings module.
The simplest form of argument is one of the following action strings (or a unique abbreviation):
ignore to ignore all warnings; default to explicitly request the default behavior (printing each
warning once per source line); all to print a warning each time it occurs (this may generate many
messages if a warning is triggered repeatedly for the same source line, such as inside a loop);
module to print each warning only the first time it occurs in each module; once to print each
warning only the first time it occurs in the program; or error to raise an exception instead of
printing a warning message.
The full form of argument is action:message:category:module:line. Here, action is as explained
above but only applies to messages that match the remaining fields. Empty fields match all
values; trailing empty fields may be omitted. The message field matches the start of the warning
message printed; this match is case-insensitive. The category field matches the warning category.
This must be a class name; the match test whether the actual warning category of the message is a
subclass of the specified warning category. The full class name must be given. The module field
matches the (fully-qualified) module name; this match is case-sensitive. The line field matches
the line number, where zero matches all line numbers and is thus equivalent to an omitted line
number.
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-x Skip the first line of the source. This is intended for a DOS specific hack only. Warning: the
line numbers in error messages will be off by one!
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-3 Warn about Python 3.x incompatibilities that 2to3 cannot trivially fix.
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